MCQ OF RCC STRUCTURE

  1. In reinforced cement concrete structures, the steel reinforcement consists of
  • Deformed bars
  • Cold twisted bars
  • Mild steel and medium tensile steel bars
  • All of these (Ans)
  1. A twisted bar has about…….more yield stress than ordinary mild steel bar
  • 10%
  • 20%
  • 35%
  • 50% (Ans)
  1. The compressive strength of concrete is about 10 to 15% of its tensile strength.
  • True
  • False(Ans)
  1. In singly reinforced beams, steel reinforcement is provided in

(a)Tensile zone (Ans)

(b) compressive zone

(c) both tensile and compressive zones

(d)neutral zone

  1. In a simply supported reinforced concrete beam, the reinforcement is placed

(a) below the neutral axis(Ans)

(b)above the neutral axis

(c) at the neutral axis

(d) any one of these

6.The joint action of steel and concrete, in a reinforced concrete section, depends upon the

(a) bond between concrete and steel bars

(b) absence of corrosion of steel bars embedded in the concrete

(c) practically equal thermal expansion of both concrete and steel

(d) all of the above(Ans)

  1. In a singly reinforced beam, the effective depth is measured from the compression edge to the

(a) tensile edge

(b) centre of tensile reinforcement(Ans)

(c) neutral axis of the beam

(d) none of these

  1. Analysis of reinforced concrete can be done by

(a) straight line theory

(b) elastic theory

(c) ultimate load theory

(d) all of these (Ans)

  1. The application of elastic theory to the beams is based on the assumption that

(a) at any cross-section, plane sections before bending remain plane after bending

(b) all tensile stresses are taken up by reinforcement alone and none by the concrete

(c) steel reinforcement is free from initial stresses when it is embedded in concrete

(d) all of the above (Ans)

  1. In case of a cantilever beam, the tensile zone is above the neutral axis.

(a)agree (Ans)

(b)disagree

  1. In a slab the transverse reinforcement is provided at an angle of to the span of the slab

(a) 45o

(b) 60o

(c) 75o

(d) 90 o (Ans)

  1. When load on the reinforced concrete beam is small so that the tensile stress set up in the concrete below the neutral axis is smaller than the permissible, then the concrete area…….the neutral axis will not crack.

(a) above

(b)below (Ans)

  1. In a singly reinforced concrete beam, if the load is very small

(a) only concrete will resist tension

(b) only steel bars will resist tension

(c) both concrete and steel will resist tension (Ans)

(d) both concrete and steel will resist compression

  1. The modular ratio is the ratio of

(a) Young’s modulus of steel to the young’s modulus of concrete (Ans)

(b)   young’s modulus of concrete to the young’s modulus of steel

(c) load carried by steel to the load carried by concrete (Ans)

(d) load carried by concrete to the load carried by steel

  1. In a reinforced concrete column, the cross-sectional area of steel bar is AS and that of concrete is AC. The equivalent area of the section in terms of concrete is equal to

(a) AS + m AC

(b) Ac + m As (Ans)

(c) AS – m AC

(d) Ac – m As

16.In a singly reinforced concrete beam, as the load increases

(a) only concrete will resist tension

(b) only steel bars will resist tension (Ans)

(c) both concrete and steel will resist tension

(d) both concrete and steel will resist compression

  1. The stress in concrete increases in direct proportion to increase in strain

(a) right

(b)wrong (Ans)

18.Normally the tensile strength of concrete is about……..of its compressive strength

(a) 10 to 15% (Ans)

(b) 15 to 20%

(c) 20 to 25%

(d) 25 to 30%

  1. If the load on beam is increased, the tensile stress in the concrete below the neutral axis will

(a) decrease

(b) increase (Ans)

(c) remain unchanged

  1. under normal loading conditions, the tensile stresses set up in the concrete will be………the permissible stress.

(a) more than (Ans)

(b) less than

(c) equal to

21.A reinforced concrete beam will crack if tensile stress set up in the concrete below the neutral axis is

(a) less than the permissible stress

(b) more than the permissible stress (Ans)

(c) equal to the permissible stress

(d) any one of these

  1. The purpose of transverse of reinforcement in a slab is to

(a) distribute the effect of point load on the slab more evenly and uniformly

(b) distribute the shrinkage and temperature cracks more evenly

(c) keep the main reinforcement in position

(d) all the above (Ans)

23.The analysis of slab spanning of one dimension is done by assuming it to be a beam of

(a) one metre length

(b) one metre width(Ans)

(c) none of these

  1. For a longitudinal reinforcing bar in a column, the cover should not be less than

(a) 10 mm

(b) 20 mm

(c) 30 mm

(d) 40 mm (Ans)

  1. In abeam section, if the steel reinforcement is of such a magnitude that the permissible stresses in concrete and steel are developed simultaneously, the is known as

(a) balanced section

(b) critical section

(c) economical section

(d) any one of these (Ans)

  1. The section in which concrete is not fully stressed to its permissible value when stress in steel reaches its maximum value, is called

(a) under – reinforced section (Ans)

(b) over – reinforced section

(c) critical section

(d) balanced section

  1. The actual neutral axis of an under – reinforced section is above the critical neutral axis of a balanced section

(a) correct (Ans)

(b) incorrect

  1. The neutral axis of a balanced section is called

(a) balanced neutral axis

(b) critical neutral axis (Ans)

(c) equivalent neutral axis

(d) all of these

  1. The moment of resistance of an under – reinforced section is computed on the basis of

(a) compressive force developed in concrete

(b) tensile force developed in steel (Ans)

(c) both (a) and (b)

(d) none of these

  1. In a singly reinforced beam, if the stress in concrete reaches its allowable limit later than the steel reaches its permissible value, the beam section is said to be under – reinforced.

(a) true (Ans)

(b) false

  1. The diameter of lateral ties, in no case, shall be less than

(a) 5 mm (Ans)

(b) 10 mm

(C) 15 mm

(d) 20 mm

  1. In an over – reinforced section

(a) steel reinforcement is not fully stressed to its permissible value (Ans)

(b) concrete is not fully stressed to its permissible value

(c) either (a) and (b)

(d) both (a) and (b)

  1. For an over – reinforced ( singly reinforced) rectangular reinforced concrete section

(a) the lever arm will be less than that for a balanced section

(b) the maximum stress developed by steel will be equal to the allowable stress in steel

(c) the maximum stress developed by concrete will be equal to allowable stress in concrete (Ans)

(d) none of the above

  1. The moment of resistance of an over – reinforced section is determined on the basis of

(a) tensile force developed in steel

(b) compressive force developed in concrete (Ans)

(c) both (a) and (b)

(d) none of these

  1. The neutral axis of an over – reinforced section falls

(a) on the critical neutral axis of balanced section

(b) below the critical neutral axis of balanced section (Ans)

(c) above the critical neutral axis of balanced section

(d) none of the above

  1. For a balanced section, the moment of resistance obtained from compressive force will be…………………the moment of resistance obtained from the tensile force.

(a) greater than

(b) less than

(c) equal to (Ans)

  1. As the percentage of steel in a beam increases, the depth of neutral axis also increases.

(a) yes (Ans)

(b) no

  1. The diameter of the polygonal links or lateral ties should not be less than the diameter of the largest longitudinal bar

(a) one-half

(b) one-third

(c) one-fourth (Ans)

39.The diameter of longitudinal bars in a column should not be less than

(a) 4 mm

(b) 8 mm

(c) 12 mm (Ans)

(d) 16 mm

  1. When a beam is loaded with transverse loads, the bending moment

(a) remains constant at every section

(b) varies from section to section (Ans)

(c) develops shear stresses in the beam (Ans)

(d) none of these

  1. The reinforced cement concrete column having helical reinforcement, should have bars of longitudinal reinforcement within its helical reinforcement

(a) two

(b) four

(c) six (Ans)

(d) eight

  1. Which one of the following statements about the percentage of tensile steel required to produce a balanced reinforced concrete section is correct?

(a) reduces as the yield strength of steel increases (Ans)

(b) remains unchanged irrespective of the strength of steel

(c) is the same for a given quality of steel irrespective of whether working stress method is followed or ultimate load method is used

(d) only a function of modulus of elasticity of steel

  1. Which of the following statement is correct regarding the working stress design of under – reinforced concrete section?

(a) the neutral axis depth will be greater than that of a balanced section.

(b) the stress in steel in tension will reach its maximum permissible value first (Ans)

(c) the moment of resistance will be less than that of the balanced section (Ans)

(d) the concrete on the tension side is also to be considered for calculating the moment of resistance of the section

44.If the unsupported lengths of columns do not exceed four times the least lateral dimension, they may be made of plin concrete

(a) right (Ans)

(b) wrong

  1. the deep beams are designed for

(a) shear force only

(b) bending moment only (Ans)

(c) both shear force and bending moment

(d) bearing

  1. The maximum permissible shear stress given in IS : 456 -1978 is based on

(a) diagonal tension failure (Ans)

(b) diagonal compression failure

(c) flexural tension failure

(d) uniaxial compression

  1. Ina column, with helical reinforcement, the permissible load is based on the core area. The least lateral dimension of such a column should be taken as

(a) equal to the diameter of core (Ans)

(b) one-half the diameter of core

(c) one-third the diameter of core

(d) one-fourth the diameter of core

  1. shearing stresses in the beam are not caused by the variation of bending moment along the span

(a) true

(b) false (Ans)

49.In a reinforced concrete beam, the shear stress distribution above the neutral axis follows a

(a) straight line

(b) circular curve

(c) parabolic curve (Ans)

(d) none of these

  1. the maximum shear stress in a rectangular beam is……….times of average shear stress.

(a) 1.15

(b) 1.25

(c) 1.50 (Ans)

(d) 1.75

  1. Which one of the following sections of equal cross – sectional area can resist the torsional moment of a R.C.C. beam section more efficiently when working stress design in adopted?

(a) An unsymmetrical section

(b) A box section

(c) A solid rectangular section (Ans)

(d) A symmetrical I-section

  1. For a reinforced concrete beam section, the shape of the shear stress diagram is

(a) parabolic over the whole section with maximum value at the neutral axis

(b) parabolic above the neutral axis and rectangular below the neutral axis (Ans)

(c) linearly varying as the distance from the neutral axis

(d) dependent on the magnitude of shear reinforcement provided

  1. The chances of diagonal tension cracks in R.C.C. member reduce when

(a) only shear force act

(b) flexural and shear force act (Ans)

(c) axial tension and shear force act simultaneously

(d) axial compression and shear force act simultaneously

  1. The diagonal tension in concrete can be resisted by providing

(a) diagonal tension reinforcement (Ans)

(b) shear reinforcement

(c) inclined tension reinforcement (Ans)

(d) all of these

  1. Shear reinforcement is provided in the form of

(a) vertical bars

(b) inclined bars

(c) combination of vertical and inclined bars

(d) any one of these (Ans)

  1. For M 15 grade concrete, shear reinforcement is necessary, if shear stress is more than

(a) 0.5 N/ mm2 (Ans)

(b) 1 N/ mm2

(c) 1.5 N/ mm2

(d) 2 N/ mm2

  1. For M 15 grade concrete, the section is to be redesigned if shear stress is more than

(a) 0.5 N/ mm2

(b) 1 N/ mm2

(c) 1.5 N/ mm2

(d) 2 N/ mm2(Ans)

  1. A long column is one whose ratio of effective length to its least lateral dimension exceeds

(a) 5

(b) 10

(c) 12 (Ans)

(d) 20

  1. The purpose of lateral ties in short reinforced concrete columns is to

(a) facilitate construction

(b) facilitate compaction of concrete

(c) avoid buclking of longitudinal bars (Ans)

(d) increase the load carrying capacity of the column

  1. At the centre of beam, the shearing stresses are practically negligible.

(a) agree (Ans)

(b) disagree

  1. The centre to concrete spacing of vertical stirrups, in a rectangular beam, is

(a) increased towards the centre of the span of the beam (Ans)

(b) decreased towards the centre of the span of the beam

(c) increased at the ends

(d) none of these

  1. The spacing of vertical stirrups in a rectangular beam is

(a) maximum near the supports

(b) minimum near the supports (Ans)

(c) maximum near the centre

(d) minimum near the centre

  1. While designing a reinforced concrete pole as a column, it is considered as

(a) fixed at both ends

(b) hinged at both ends

(C) fixed at one end and hinged at the other end (Ans)

(d) none of the above

  1. A stirrups consists of………diameter mid steel bars bent round the tensile reinforcement

(a) 1 to 5 mm

(b) 5 to 12 (Ans)

(c) 12 to 18 mm

  1. According to IS : 456 – 1978, the spacing of stirrups shall not exceed a distance…………..the lever arm of the resisting moment.

(a) equal to (Ans)

(b) double

(c) three times

  1. The torsion resisting capacity of a given reinforced concrete section

(a) decreases with decrease in stirrup spacing

(b) decreases with increase in longitudinal bars

(c) does not depend upon stirrup and longitudinal steels

(d) increases with increase in stirrup and longitudinal steels (Ans)

  1. When the steel bars are embedded in concrete, the concrete after setting, adheres to the surface of the bars and thus resist any force that tends to pull or push this rod. The intensity of this adhesive force is called

(a) bond stress (Ans)

(b) shear stress

(c) compressive stress

(d) none of these

  1. The longitudinal shearing stresses acting on the surface between the steel and concrete are called

(a) bond stresses (Ans)

(b) tensile stresses

(c) compressive stresses

(d) none of these

  1. The bond between steel and concrete is mainly due to

(a) pure adhesive resistance

(b) frictional resistance

(c) mechanical resistance

(d) all of these (Ans)

  1. Pure adhesive resistance in a reinforced concrete structure is provided by

(a) shrinkage of the concrete

(b) deformed bars

(c) relatively weak adhesive of the chemical gum produced by concrete during setting (Ans)

(d) all of the above

  1. Frictional resistance on a reinforced concrete structure is provided by the shrinkage of concrete.

(a) correct (Ans)

(b) incorrect

  1. When a reinforced concrete structure is loaded, the resistance first broken is

(a) pure adhesive resistance (Ans)

(b) frictional resistance

(c) mechanical resistance

(d) none of these

  1. The hooks and other means of anchoring steel bar do not prevent the initial slipping of reinforced concrete structure.

(a) right (Ans)

(b) wrong

  1. The term ‘bond’ is used to describe the means by which…………………between steel and concrete is prevented.

(a) resistance

(b) crack

(c) slip (Ans)

  1. Which of the following statement is wrong?

(a) the hooks and other means of anchoring do not delay the collapse of structure

(b) the frictional resistance is high for smooth bar surface

(c) in the case of deformed bars, adhesion and friction become major elements.

(d) all of the above (Ans)

  1. When the ratio of effective length of the column to its least lateral dimension does not exceed 15, it is termed as a

(a) long column

(b) short column (Ans)

(c) plain column

(d) none of these

  1. The permissible value of bond stress for M15 grade of concrete is limited to

(a) 0.5 N/ mm2

(b) 1 N/ mm2 (Ans)

(c) 1.5 N/ mm2

(d) 2 N/ mm2

78.If the bond stress developed in a reinforced concrete beam is more than permissible value, it can be brought down by

(a) increasing the depth  of beam

(b) increasing the number of bars

(c) decreasing the diameter of the bars

(d) all of these (Ans)

  1. In reinforced columns, higher percentage of steel may cause difficulty in placing and compacting the concrete

(a) true (Ans)

(b) false

  1. For reinforcing bars in compression, the average bond stress can be increased by

(a) 10%

(b) 25% (Ans)

(c) 50%

(d) 75%

  1. When hooks are formed in deformed bars, the internal radius of the bond should be at least……………times the diameter of the bar.

(a) two

(b) three (Ans)

(c) four

(d) six

  1. In the above question, the length of straight bar beyond the end of the curve should be at least

(a) two times the diameter of bar

(b) three times the diameter of bar

(C) four times the diameter of bar (Ans)

(d) five times the diameter of bar

  1. In the case of deformed bars, the value of bond stress for various grades of concrete is greater by………..than the plain bars.

(a) 10%

(b) 20% (Ans)

(c) 30%

(d) 40%

  1. The formed bars may be used without hooks, provided anchorage requirements are adequately met with

(a) yes (Ans)

(b) no

  1. Bars of tensile reinforcement of a rectangular beam

(a) are curtailed when not required to resist the bending moment

(b) are bent up at suitable places to serve as shear reinforcement

(c) are maintained in the bottom to provide at least the local bond stress

(d) all of the above (Ans)

  1. The shape of a column should be

(a) circular

(b) rectangular

(c) square

(d) any one of these (Ans)

  1. When an inclined or horizontal member is carrying mainly axial loads, it is termed as a

(a) strut (Ans)

(b) column

(c) tie

(d)all of these

  1. The width of the flange of the L-beam is taken as

(a) one-sixth of the effective span of L-beam

(b) breadth of rib plus one-half of the clear distance between the rib

(c) breadth of rib plus four times the thickness of the slab

(d) minimum value of (a), (b) or (c) (Ans)

  1. The maximum spacing of vertical reinforcement in R.C.C. wall should not exceed………the thickness of wall.

(a)equal to

(b) 1.5 times

(c) 2 times

(d) 3 times (Ans)

  1. The measurement of anchorage length of inclined bars, used to act as shear reinforcement is taken in
  • Tension zone from the end of the sloping portion of the bar (Ans)
  • Compression zone from mid – depth of the beam (Ans)
  • Tension zone and the mid – depth of the beam
  • Compression zone from the end of the sloping portion of the bar
  1. The minimum spacing between horizontal parallel reinforcements of the same diameter should not be less than the diameter of bar.

(a)agree (Ans)

(b) disagree

  1. Generally, the lapped splices in tensile reinforcement, are not used for bars of more than 50 mm diameter.

(a) true

(b) false (Ans)

  1. Which of the following statement is correct?

(a) the anchorage value of a hook is assumed sixteen terms the diameter of the round bar if the angle of the bond is 45o.

(b) steel bars are generally connected together to get greater length than the standard lengths by providing hooked splice.

(c) for plain mild steel reinforcing bars, when hooks are used, they should be of U-type.

(d) all of the above (Ans)

  1. In a doubly reinforced beam, steel reinforcement is provided in a

(a) tensile zone

(b) compression zone

(c) either (a) and (b)

(d) both (a) and (b) (Ans)

95. A doubly reinforced section is used

(a) when the members are subjected to alternate external loads and the bending moment in the sections reverses

(b) when the members are subjected to loading eccentric on either side of the axis

(c) when the members are subjected to accidental lateral loads

(d) all of the above (Ans)

  1. The theory of doubly reinforced section is based on the same assumptions as for singly reinforced section

(a) correct (Ans)

(b) incorrect

  1. In doubly reinforced rectangular beam, the allowable stress in compression steel is……………..the permissible stress in tension in steel.

(a) equal to

(b) less than (Ans)

(c) greater than

  1. A doubly reinforced beam is considered less economical than a singly reinforced beam because

(a) shear reinforcement is more (Ans)

(b) compressive steel is under – stressed

(c) tensile steel required is more than that for balanced section

(d) concrete is not stressed to its full value

  1. When a vertical member is carrying mainly axial loads, it is termed as a

(a) strut

(b) column (Ans)

(c) tie

(d) all of these

  1. In a doubly reinforced concrete section, the presence of steel bars in compression zone……………the depth of the neutral axis.

(a) effects

(b) does not effect (Ans)

  1. If the area of tensile steel reinforced is doubled, the moment of resistance of the beam increases only by about

(a) 12%

(b) 22% (Ans)

(c) 32%

(d) 42%

  1. In the steel beam theory of doubly reinforced concrete beams, it is assumed that

(a) compression steel resists the compression

(b) stress in compression steel is equal to stress in tension steel

(c) in tension and compression concrete, no stress in developed

(d) all of the above (Ans)

  1. The concrete below the neutral axis

(a) resists the bending moment

(b) embeds the tensile steel (Ans)

(c) both (a) and (b)

(d) none of these

  1. The section of the beam having greater width at the top in comparison to the width below neutral axis is known as

(a)critical section

(b) T – section (Ans)

(c) L – section

(d) none of these

  1. The portion of the slab which acts monolithically with the beam and which resists the compressive stresses, is called…………of flange of the T – beam.

(a)breadth (Ans)

(b) thickness

(c) depth

  1. The breadth of the flange of a T – beam is taken as

(a) one – third of the effective span of the T – beam

( b) twelve times the depth of slab plus breadth of rib

  • centre to centre distance between the adjacent beams
  • minimum value of (a), (b) or (c)
  1. In a T – beam, the breadth of the rib is equal to

(a)total thickness of the slab, including cover

(b) width of the portion of the beam in the compression zone

(c) width of the portion of the beam in the tensile zone (Ans)

(d) none of the above

  1. The breadth of rib in a T- beam should be sufficient to

(a) provide lateral stability (Ans)

(b) carry heavy loads

(c) accommodate the tensile reinforcement with proper spacing between  the bases (Ans)

(d) all of the above

  1. The thickness of flange in a T-beam is taken equal to the total thickness of the slab, including cover.

(a) right (Ans)

(b) wrong

  1. The intensity of compressive stress just, above the neutral axis, is of very………………magnitude.

(a)small (Ans)

(b) large

  1. The slab forms the compression flange of the T-beam.

(a) yes (Ans)

(b) no

  1. The breadth of rib in a T-beam should at least be equal to……….the depth of rib.

(a) one – half

(b) one – third (Ans)

(c) one – fourth

(d) one – sixth

  1. In a T-beam, the vertical distance between the bottom of the flange and the centre of the tensile reinforcement is known as the

(a) breadth of flange

(b) thickness of flange

(c) breadth of slab

(d) depth of rib (Ans)

  1. The side face reinforcement, if required, in a T-beam will be

(a) 0.1 % of the web area (Ans)

(b) 0.15 % of the web area

(c) 0.2 % to 0.3 % of the web area depending upon the breadth of the slab

(d) half the longitudinal reinforcement

  1. The effective depth of a T-beam is the distance between the

(a) centre of the flange and the top of the tensile reinforcement

(b) top of the flange and the centre of the tensile reinforcement (Ans)

(c) bottom of the flange and the centre of the tensile reinforcement

(d) centre of the flange and the bottom of the tensile reinforcement

  1. The moment of resistance of the T-beam is found by multiplying the total…………and the lever arm.

(a) tension

(b) compression (Ans)

  1. In a reinforced concrete T-beam (in which the flange is in compression), the position of neutral axis will

(a) be within the flange

(b) be within the web

(c) depend on the thickness of flange in relation to total depth and percentage of reinforcement (Ans)

(d) at the junction of flange and web

  1. The neutral axis in a T-beam section falls

(a) within the flange

(b) outside the flange

(c) either (a) or (b) (Ans)

(d) none of these

  1. A T-beam behaves like a rectangular beam of width equal to its flange, if neutral axis

(a) remains outside the flange

(b) remains within the flange (Ans)

(c) remains below the slab

(d) both (a) and (b)

  1. The neutral axis in a T-beam section may fall within the flange when the slab is comparatively thicker

(a) agree (Ans)

(b) disagree

  1. For bridge slabs, the amount of transverse reinforcement is taken as

(a) 0.15 % of gross concrete area

(b) 0.3 % of gross concrete area (Ans)

(c) 0.45 % of gross concrete area

(d) 0.6 % of gross concrete area

  1. For simply supported slabs spanning in one direction, the ratio of span to overall depth should not exceed

(a) 15

(b) 20

(c) 30 (Ans)

(d) 50

  1. The distribution reinforcement is also called……………….reinforcement

(a) longitudinal

(b) transverse (Ans)

  1. A reinforced concrete slab is 75 mm thick. The maximum size of reinforcement bar that can be used is

(a) 6 mm dia.

(b) 8 mm dia. (Ans)

(c) 10 mm dia.

(d) 12 mm dia.

  1. The shrinkage in a concrete slab

(a) causes shear cracks

(b) causes tension cracks (Ans)

(c) causes compression cracks

(d) does not cause any cracking

  1. The diameter of bars for main reinforcement in slabs, may vary from

(a) 2 to 4 mm

(b) 4 to 8 mm

(c) 8 to 14 mm (Ans)

(d)14 to 18 mm

  1. The pitch of bars of main reinforcement in solid slab should not exceed………………the effective depth of slab or 60 cm whichever is smaller

(a) double

(b) three times (Ans)

(c) five times

(d) six times

  1. The diameter of bars used for distribution reinforcement in slabs, may vary from

(a) 2 to 4 mm

(b) 4 to 6 mm

(c) 6 to 8 mm (Ans)

(d) 8 to 12 mm

  1. In a simply supported slab, the pitch of distribution reinforcement should not be more than…………the effective depth of slab of 60 cm whichever is smaller

(a) double

(b) three times

(c) five times (Ans)

(d) six times

  1. In a simply supported slab, alternate bars are curtailed at

(a) one-fifth of the span

(b) one-sixth of the span

(c) one-seventh of the span (Ans)

(d) one-eighth of the span

  1. When a slab is continuous over several spans, negative(i.e. hogging) bending moment is induced over the

(a) end supports

(b) intermediate supports (Ans)

(c) both (a) and (b)

(d) none of these

132.When the slab is supported on all the four edges and the ratio of long span to short span is small, bending takes place along both the spans. Such a slab is known as a

(a) slab spanning in one direction

(b) one-way slab

(c) slab spanning in two direction (Ans)

(d)  two-way slab

  1. A two way slab

(a) may be simply supported on the four edges, with corners not held down and carrying uniformly distributed load

(b) may be simply supported on the four edges, with corners  held down and carrying uniformly distributed load

(c) may have edges fixed or continuous and carrying uniformly distributed load

(d)all of the above (Ans)

  1. For a slab spanning in two directions, the ratio of span to the depth of slab should not exceed

(a) 10

(b) 20

(c) 35 (Ans)

(d) 50

  1. In case of two way slab, the limiting defection of the slab is

(a) primarily a function of the long span

(b) primarily a function of the short span (Ans)

(c) independent of long or short spans

(d)dependent on both long and short spans

  1. If the sides of a slab simply supported on its edges and spanning in two ways are equal, then the maximum bending moment is multiplied by

(a) 0.25

(b) 0.50 (Ans)

(c) 0.75

(d) 0.85

  1. A reinforced slab, built monolithically with the supporting columns and is reinforced in two or more directions, without any provision of beams, is called a

(a) two way slab

(b) flat slab (Ans)

(c) continuous slab

(d) circular slab

138.The part of a slab around the column, which is of greater thickness than the rest of the slab, is known as

(a) column head

(b) panel

(c) capital

(d) drop (Ans)

  1. The column head of flat slab

(a) increases rigidity of the slab and column connection (Ans)

(b) decreases resistance of the slab of shear

(c) increases the effective span of the slab

(d) all of the above

  1. A panel of a flat slab is

(a) that part of a slab around the column which is of greater thickness than the rest of the slab

(b) that part of column which has increased diameter

(c) the area enclosed between the centre lines connecting adjacent columns in two directions and the outline of the column heads (Ans)

(d) none of the above

  1. In flat slabs, the width of column strip, where drops are not used, is taken as

(a) one-half of the width of panel (Ans)

(b) one-third of the width of panel

(c) one-fourth of the width of panel

(d) none of these

  1. The drops are provided in flat slabs to resist

(a) torsion

(b) bending moment

(c) thrust

(d) shear (Ans)

  1. The flat slab transfers the load directly to the supporting columns suitably spaced below the slab

(a) agree (Ans)

(b) disagree

144.The width of the middle strip in flat slab, where drops are used, is taken as

(a) one-half of the width of panel

(b) equal to the width of the drop

(c) the difference between the width of the panel and the drop (Ans)

(d) any one of the above

  1. The total thickness of flat slab, is no case, should be less than

(a) 125 mm (Ans)

(b) 200 mm

(c) 275 mm

(d) 350 mm

  1. If l is the average length of a panel, then the total thickness of a flat slab of interior panels without drops, should not be less then

(a) L / 32

(b) L / 36 (Ans)

(c) L / 40

(d) L / 48

  1. In a flat slab, the angle of greatest slope of the column head from the vertical should not exceed

(a) 30o

(b) 45o (Ans)

(c) 60o

(d) 75o

  1. The diameter of the column head should be taken as its diameter measured below the underside of the slab at a distance of

(a) 20 mm

(b) 40 mm (Ans)

(c) 60 mm

(d) 80 mm

  1. The diameter of column head in a flat slab, should not be more than

(a) 0.10 L

(b) 0.25 L (Ans)

(c) 0.40 L

(d) 0.50 L

Where         L = Average length of a panel

  1. In four – way system of arranging the reinforcement, the reinforcement is provided in

(a) column strips

(b) diagonal strips

(c) either (a) or (b)

(d) both (a) and (b) (Ans)

  1. While arranging the reinforcement in four way system, the additional reinforcement should be provided to resist the negative moment on the middle strip.

(a) correct (Ans)

(b) incorrect

  1. In a flat slab, the shear force value used for the calculation of bond stress should be taken equal to………….times the total load on one panel, for exterior panels

(a) 0.2

(b) 0.4 (Ans)

(c) 0.6

(d) 0.8

  1. Circular slab is used for

(a) roof of pump houses constructed above tube wells

(b) roof of a traffic control post at the intersection of roads

(c) floor of circular water tanks

(d) all of these (Ans)

  1. When a circular slab simply supported at the edge is loaded with uniformly distributed load, the stresses are developed in

(a) radial direction only

(b) circumferential direction only

(c) both radial and circumferential direction (Ans)

(d) none of these

  1. For a circular slab carrying a uniformly distributed load, the ratio of maximum negative redial moment and the maximum positive radial moment is equal to

(a) 2 (Ans)

(b) 4

(c) 6

(d) 8

  1. In a circular slab, the reinforcement is provided at the…………..side of the slab

(a) convex (Ans)

(b) concave

  1. A ribbed slab is provided where

(a) pain ceiling is required

(b) thermal insulation is required

(c) acoustic insulation is required

(d) all of these (Ans)

  1. The thickness of the topping of a ribbed slab is kept from

(a) 10 to 30 mm

(b) 30 to 50 mm

(c) 50 to 80 mm (Ans)

(d) 80 to 110 mm

  1. In a ribbed slab, the clear spacing between the ribs should not be more than

(a) 300 mm

(b) 450 mm (Ans)

(c) 600 mm

(d) 800 mm

  1. For a ribbed slab, the overall depth of the slab shall not exceed………..the width of slab

(a) two times

(b) three times

(c) four times (Ans)

(d) five times

  1. The width of rib, for a ribbed slab, should not be less than 75 mm

(a) agree (Ans)

(b) disagree

162.The diameter of a bar used in ribbed slab should not be more than

(a) 12 mm

(b) 18 mm

(c) 22 mm (Ans)

(d) 30 mm

163.Footing is that portion of a foundation which do not deliver the load to the soil

(a) true

(b) false (Ans)

  1. According to Terzaghi, a foundation is said to be shallow if its depth is

(a) equal to its width

(b) less than its width

(c) greater than its width

(d) either (a) and (b) (Ans)

  1. The object of providing foundation to a structure is to

(a) distribute the load of superstructure over a large bearing area

(b)prevent the lateral movement of the supporting material

(c) increase the stability of structure

(d) all of the above (Ans)

  1. A footing which supports two or more columns is termed as

(a) combined footing (Ans)

(b) raft footing

(c) strap footing

(d) none of these

  1. Which of the following statement is correct?

(a) the strap footing does not transfer any pressure to the soil

(b)a raft footing is a combined footing that covers the entire area beneath a structure.

(c) a pile foundation is used where the top soil is relatively weak.

(d) all of the above (Ans)

  1. In a footing, it is used to assume that the maximum value of transverse bending will occur at a distance, equal to(measured from the face of the column)

(a) half of effective depth

(b) effective depth (Ans)

(c) twice the effective depth

(d) breadth of column on each side

  1. When the footing is symmetrically loaded, the pressure beneath the footing will

(a) be uniform

(b) not be uniform (Ans)

(c) be zero in the centre

(d) be more at the edges

  1. For the purposes of the design of reinforced concrete footings, pressure distribution is assumed to be

(a) linear (Ans)

(b) parabolic

(c) hyperbolic

(d) none of these

  1. End bearing piles are used

(a) to transfer load through water or soft soil to a suitable bearing stratum (Ans)

(b) to resist large horizontal or inclined forces

(c) to compact loose granular soil

(d) all the above

 

  1. The weight of footings is assumed as………….of the weight transferred to the column.

(a) 5 %

(b) 10 % (Ans)

(c) 15 %

(d) 20 %

  1. When there are some restrictions on the maximum value of the footing, a……………..footing should be provided even for a square column.

(a) triangular

(b) trapezoidal

(c) rectangular (Ans)

(d) circular

  1. The footing at the base for a circular column may be

(a) trapezoidal

(b) square

(c) circle

(d) either (b) or (c) (Ans)

  1. A combined footing is provided when the

(a) bearing capacity of soil is less

(b) end column is near a property line

(c) columns are very near to each other so that their footing overlap

(d) all of the above (Ans)

  1. A combined footing may be

(a) trapezoidal

(b) square

(c) circle

(d) either(a) or (b) (Ans)

  1. The combined footing, in the longitudinal direction, will have

(a) sagging bending moment in the two cantilever portions

(b) hogging bending moment in some length of middle portion

(c) either (a) or (b)

(d) both (a) and (b) (Ans)

  1. The combined footing, in the transverse direction, will have………………..bending moment.

(a) sagging (Ans)

(b) hogging

  1. The footing have a tendency to bend in the form of a saucer, near the columns.

(a) agree (Ans)

(b) disagree

  1. In a combined footing, the sections near and around the column will be subjected to……………..bending stresses.

(a) minimum

(b) maximum (Ans)

  1. At a certain section, in a combined footing for two columns carrying unequal loads, the shear force is zero. At this section

(a) sagging moment is zero

(b) sagging moment is maximum

(c) hogging moment is zero

(d) hogging moment is maximum (Ans)

  1. A combined footing for two columns should be designed for

(a) maximum hogging bending moment (Ans)

(b) sagging bending moment at the outer face of esch column (Ans)

(c) sagging bending moment at the inner face of each column

(d) none of the above

  1. In a combined footing, the reinforcement should be placed

(a) on the bottom face for sagging bending moment (Ans)

(b) on the top face for hogging bending moment (Ans)

(c) on the bottom face for hogging bending moment

(d) on the top face for sagging bending moment

  1. A combined trapezoidal footing for two columns becomes essential when

(a) there is some restriction on the total length of the footing (Ans)

(b) heavily loaded column is near the property line(Ans)

(c) minimum loaded column is near the property line

(d) none of the above

  1. The precast concrete piles are generally used for a maximum design load of about except for large prestressed piles

(a) 40 tonnes

(b) 60 tonnes

(c) 80 tonnes    (Ans)

(d) 100 tonnes

  1. The hammer used in driving piles should be

(a) drop hammer

(b) diesel hammer

(c) vibratory hammer

(d) all of these (Ans)

  1. In designing reinforced concrete piles as a column, it is considered as

(a) fixed at both ends

(b) hinged at both ends

(c) fixed at one end and hinged at the other end (Ans)

(d) any one of the above

  1. The length of a reinforced concrete pile is taken as……..the length embedded in firm stratum

(a) one-half

(b) one-third

(c) two-third (Ans)

(d) three-fourth

  1. For reinforced piles having length upto 30 times its width, the main longitudinal reinforcement should not be less than……………..of the gross cross-sectional area of the pile.

(a) 1.25 % (Ans)

(b) 1.5 %

(c) 2 %

(d) 2.5 %

190.If the maximum bending moment of a pile of length L  carrying uniformly distributed load w per unit length is wL2/90, then the pile is suspended at

(a) one points

(b) two points

(c) three points (Ans)

(d) four points

  1. A pile of length L carrying uniformly distributed load, is suspended at two points. The hogging bending moment at the points of suspension will be equal to sagging bending moment at the middle of pile, if the point of suspension from either end of a pile is equal to

(a) 0.15 L

(b) 0.207 L (Ans)

(c) 0.312 L

(d) 0.41 L

  1. According to Rankine’s theory as applied to retaining walls,

(a) the soil mass is semi-infinite, homogeneous, dry and cohesionless

(b) the back of the retaining wall is vertical and smooth

(c) the retaining wall yields about the base

(d) all of the above (Ans)

  1. The total active earth pressure acts at……….above the base of the retaining wall.

(a) H/2

(b) H/3 (Ans)

(c) H/4

(d) H/6

  1. 194. In submerged backfill, the sand fill behind the retaining wall

(a) is dry

(b) is saturated with water (Ans)

(c) has uniform surcharge

(d) has sloping surface

  1. The passive earth pressure is exerted on the retaining wall when it has a tendency to move…………the backfill

(a) away from

(b) towards (Ans)

  1. A buttress in a wall is intended to provide

(a) lateral support to roof slab only

(b) lateral support to wall (Ans)

(c) to resist vertical loads only

(d) lateral support to roof beams only

  1. In the design of a masonry retaining wall, the

(a) vertical load should fall within the middle-third of base width

(b) horizontal thrust should act at h/3 from base

(c) resultant load should fall within a distance of one-sixth of base width on either side of its mid point (Ans)

(d)   resultant load should fall within a distance of one-eight of base width on either side of its mid point

  1. In a reinforced concrete retaining wall, a shear key is provided, if the

(a) shear stress in the vertical stream is excessive

(b) shear force in the toe slab is more than that in the heel slab

(c) retaining wall is not safe against sliding (Ans)

(d) retaining wall is not safe against overturning.

  1. The factor of safety due to overturning of the retaining wall is generally taken as

(a) 2 (Ans)

(b) 4

(c) 6

(d) 8

  1. The factor of safety due to sliding of the retaining wall is generally taken as

(a) 1

(b) 1.5 (Ans)

(c) 2

(d) 4

  1. The toe slab of a retaining wall is reinforced at bottom face of the slab

(a) yes (Ans)

(b) no

  1. The stem of a retaining wall is reinforced near the earth side

(a) true (Ans)

(b) false

  1. The heel slab of a retaining wall is reinforced at the…………..of the slab.

(a) bottom face

(b) top face (Ans)

(c) middle

  1. In a cantilever retaining wall, the bending moment in the vertical stem varies as

(a) h

(b) h2

(c) h3 (Ans)

(d) h4

Where            h = Height of the stem

  1. A cantilever retaining wall should not be used for heights more than

(a) 4 m

(b) 6 m (Ans)

(c) 8 m

(d) 10 m

  1. The counterforts in a retaining wall supports the

(a) stem

(b) toe slab

(c) heel slab (Ans)

(d) none of these

  1. The length of the staircase situated between two loadings is called

(a) rise

(b) flight (Ans)

(c) tread

(d) waist slab

  1. The sum of tread plus twice the rise of a stair is kept as

(a) 300 mm

(b) 400 mm

(c) 500 mm

(d) 600 mm (Ans)

  1. The product of tread and rise(in mm) of a stair is kept as

(a) 30 000

(b) 40 000 (Ans)

(c) 50 000

(d) 60 000

  1. In residential buildings, the rise of a stair may vary between

(a) 100 mm to 150 mm

(b) 150 mm to 200 mm (Ans)

(c) 200 mm to 250 mm

(d) 250 mm to 300 mm

  1. The tread of a stair is kept as 250 mm to 300 mm for public buildings.

(a) agree (Ans)

(b) disagree

  1. When the stair slab is spanning horizontally, a waist-slab of about……….is provided

(a) 50 mm

(b) 80 mm (Ans)

(c) 100 mm

(d) 120 mm

  1. The dead weight of a stair consists of

(a) dead weight of waist slab (Ans)

(b) dead weight of steps

(c) dead weight of stringer beam

(d) all of these

  1. In stair spanning horizontally, the distribution reinforcement provided in the form of……………diameter rods at 30 cm centre is normally adequate.

(a) 4 mm

(b) 6 mm (Ans)

(c) 10 mm

(d) 12 mm

  1. A pre-stressed concrete induces artificially……….stresses in a structure before it is loaded.

(a) tensile

(b) compressive (Ans)

(c) shear

216.In a pre-stressed concrete structure

(a) dead load of structure is reduced

(b) creacking of concrete is avoided

(c) the cost of supporting structure and foundation is reduced

(d) all of  the above (Ans)

  1. In a pre-stressed concrete member

(a) high strength concrete should be used

(b)  low strength concrete should be used

(c) high strength concrete and low tensile steel should be used

(d) high strength concrete and high tensile steel should be used (Ans)

  1. The ultimate moment resisting capacity of a simple supported pre-stressed concreted beam is obtained by using

(a) force and moment equilibrium equations (Ans)

(b) stress-strain relationship of concrete and steel

(c) moment equilibrium and compatibility condition

(d) force equilibrium equation alone

  1. The ultimate strength of the steel used for pre-stressing is nearly

(a) 250 N/mm2

(b) 415 N/mm2

(c) 500 N/mm2 (Ans)

(d) 1500 N/mm2

  1. The cube strength of the concrete used for pre-stressed member should not be less than

(a) 10 N/mm2

(b) 25 N/mm2

(c) 35 N/mm2 (Ans)

(d) 50 N/mm2

  1. The assumption made in the design of pre-stressed concrete sections under working load is that

(a) a plane cross-section before loading remain plane after loading

(b) any change in loading produces change of stress in concrete

(c) pre-stressing in steel remains constant

(d) all of the above (Ans)

  1. The cable for a pre-stressed concrete simply supported beam subjected to uniformly distributed load over the entire span should ideally be

(a) placed at the centre of cross-setion over the entire span

(b) placed at some eccentricity over the entire span

(c) varying linearly from the centre of cross-section of the ends to maximum eccentricity at the middle section

(d) parabolic with zero eccentricity at the ends and maximum eccentricity at the centre of the span (Ans)

  1. In post-tensioned pre-stressed concrete beam, the end block zone is the zone between the end of the beam and the section where

(a) no lateral stresses exist

(b) only longitudinal stresses exist (Ans)

(c) only shear stresses exist

(d) shear stresses are maximum

  1. The propagation of a shear crack in a pre-stressed concrete member depends upon

(a) tensile reinforcement

(b) compression reinforcement

(c) shear reinforcement

(d) shape of the cross-section of beam (Ans)

  1. The major loss of pre-stress is caused due to

(a) creep of concrete

(b) relaxation of steel

(c) shrinkage of concrete

(d) all of these (Ans)

  1. The loss of stress with time at constant strain is called

(a) relaxation

(b) creep

(c) shrinkage

(d) ductility

  1. The losses in pre-stress in pre-tensioning system are due to

(a) friction

(b)  shrinkage and creep of concrete (Ans)

(c) elastic deformation of concrete when wires are tensioned successively

(d) none of the above

  1. If the loading on a simply supported pre-stressed concrete beam is uniformly distributed, the centroid of tendons should be preferably

(a) a straight profile along the centroidal axis

(b) a straight profile along with the lower kern

(c) a parabolic profile with convexity downward (Ans)

(d) a circular profile with convexity upward

  1. In pre-tensioning scheme, pre-stress load is transferred in

(a) a single stage process

(b)  a multi stage process (Ans)

(c) either single stage or multi stage process depending upon the magnitude of load transfer

(d) the same manner as in post-tensioning scheme

  1. In the conventional pre-stressing, the diagonal tension in concrete

(a) increases

(b) decreases (Ans)

(c) does not change

(d) may increase or decrease

  1. The magnitude of loss of pre-stress due to relaxation of steel should be taken to vary from………of the average initial stress.

(a) 0.5 to 2%

(b) 2 to 8% (Ans)

(c) 8 to 10%

(d) 10 to 12%

  1. According to Indian standard, the total amount of shrinkage for a pre-tensioned beam is taken as

(a) 3*10-4 (Ans)

(b) 3*10-5

(c) 3*10-6

(d) 3*10-7

  1. At the time of tensioning, the maximum tensile stress behind the anchorages should not exceed

(a) 60% of the ultimate tensile strength of the bar for steels without a definite yield point

(b) 80% of the yield stress for steels with guaranteed yield point

(c) 80% of the ultimate strength of the bar for steel without a definite yield point (Ans)

(d) the yield stress for steel with guaranteed yield point (Ans)

  1. For pre-stressed structural elements, high strength concrete is used primarily because

(a) both shrinkage and creep are more

(b) shrinkage is less but creep is more

(c) modulus of elasticity and creep values are higher

(d) high modulus of elasticity and low creep (Ans)

  1. The diagonal tension in a pre-stressed concrete member will be………….shear stress

(a) equal to

(b) less than (Ans)

(c) more than

  1. When a pre-stressed rectangular beam is loaded with uniformly distributed load, the tendon provided should be parabolic with convexity downward

(a) true (Ans)

(b) false

  1. A simply supported concrete beam, pre-stressed with a force of 2500 kN is designed by load balancing concept for an effective span of 10 m and to carry a total load of 40kN/m. The central dip of the cable profile should be

(a) 100 mm

(b) 200 mm (Ans)

(c) 300 mm

(d) 400 mm

 

238. The relation between the modulus of rupture  fcr spilitting strength fcs and direct tensile strength fct is written as

  1. fcr   = fcs = fct
  2. fcr   > fcs > fct  (Ans)
  3. fcr   < fcs < fct
  4. fcs   > fcs > fct

239. The compressive strength of 100 mm cube as compared to 150 mm cube is always,

  1. less
  2. more (Ans)
  3. equal
  4. none of these

240.  As per code provision the modulus of elasticity of concrete can be written as,(N/mm2)

  1. Ec = 5700√fck (Ans)
  2. Ec = 570√fck
  3. Ec = 5700fck
  4. Ec = 700√fck

241. In case of reinforced concrete section , the shape of shear stress diagram is ,

  1. Wholly parabolic (Ans)
  2. Wholly rectangular
  3. Parabolic above neutral axis and rectangular below neutral axis
  4. Rectangular above neutral axis and parabolic below neutral axis

242.  Diagonal tension in beam is

  1. Maximum at neutral axis
  2. Decrease below the neutral axis and increase above neutral axis
  3. Increase below neutral axis and decrease above neutral axis (Ans)
  4. Remains same

243. If any beam fails in bond , its bond strength can be increase most economically by,

  1. Increasing the depth of beam
  2. Using thinner bars but more in no (Ans)
  3. Using thicker bar but less in number
  4. Providing the vertical stirrups

244. The ratio of the diameter of reinforcing bars –and the slab thickness is

  1. 1/4
  2. 1/5
  3. 1/6
  4. 1/8 (Ans)

245. Minimum p-itch of transverse reinforcement in a column is,

  1. The lease lateral dimension of the member
  2. Sixteen times the smallest diameter of longitudinal reinforcement bar to be tied
  3. Forty eight times the diameter of transverse reinforcement
  4. Lesser of the above three values (Ans)

246. If the storey height equal to length of RCC wall , the percentage increase in strength is,

  1. 0
  2. 10 (Ans)
  3. 20
  4. 30

247. The expression of modular ratio m= 280 / 3бcbc,  where 3бcbc  is the permissible compressible stress due to bending in concrete in N/mm2,

  1. Fully takes into account the long term effect such as creep
  2. Partially takes into account the long term effect such as creep (Ans)
  3. Does not take into account the long term effect such as creep
  4. Is the same as the modular ratio based on the value of modulus of elasticity of structural concrete Ec

248. The main reason for providing no of reinforcing bars at a support in a simply supported beam is to resist in that zone,

  1. Compressive stress
  2. Shear stress
  3. Bond stress (Ans)
  4. Tensile stress

249. Half of the main steel in a simply supported slab is bent up near the supportat a distance of  X from the centre of slab bearing where X is equal to ,

  1. 1/3
  2. 1/5
  3. 1/7 (Ans)
  4. 1/10

250. If the size of panel of a flat slab 6m X 6m  then the width of column strip and middle strip are,

  1. 3.0 m and 1.5 m
  2. 1.5 m and 3.0 m
  3. 3.0 m and 3.0 m
  4. 1.5m and 1.5 m (Ans)

251. The limit of percental p of the longitudinal reinforcement in a column is given by,

  1. 0.15 % to 2%
  2. 0.8% to 4%
  3. 0.8% to 6% (Ans)
  4. 0.8% to 8%

252. Which of the following retaining wall is suitable for height beyond 6 m ?

  1. L shapped wall
  2. T shapped wall
  3. Counterfort type (Ans)
  4. All of these

253. In a pile of length L , the points of suspension from ends for lifting it are located at

  1. 0.207l(Ans)
  2. 0.25l
  3. 0.293l
  4. 0.333l

254. During erection, the pile of length l is supported bya crane at a distance of

  1. 0.207l
  2. 0.293l
  3. 0.707l (Ans)
  4. 0.793l

255. While designing the pile as column, the end condition are nearly

  1. both ends hinged
  2. both ends fixed
  3. one end fixed and other end hinged (Ans)
  4. one end fixed other end free

256.  In case of reinforced sections, shrinkage stresses in concrete and steel are respectively,

  1. compressive and tensile
  2. tensile and compressive (Ans)
  3. both compressive
  4. both tensile

257. A beam curved in plan is designed for,

  1. bending moment and shear
  2. Bending moment and torsion
  3. Shear and torsion
  4. Bending moment , shear and torsion (Ans)

258.  The purpose of reinforcement in prestressed concrete is,

  1. To provide adequate bond stress
  2. To resist tensile stress
  3. To impart initial compressive stress in concrete (Ans)
  4. All the above

259. The high carbon content in the steel causes,

  1. Decrease in tensile strength but increase in ductility
  2. Increase in tensile strength but decrease in ductility (Ans)
  3. Decrease in both tensile and ductility
  4. Increase both the tension and ductility

260. Cube strength of controlled concrete to be used for pretensioned and post tension work respectively should not be less than

  1. 35 Mpa and 45 Mpa

2. 42Mpa and 35Mpa (Ans)

3. 42Mpa and 53Mpa

4. 53Mpa and 42Mpa

261. The bond strength between steel and concrete due to

  1. Friction

2. Adhesion

3. Both friction and adhesion  (Ans)

4. None of the above

262. In reinforced concrete, pedestal is defined as a compression member,whose effective length does not exceed its least lateral dimension by,

  1. 12 times

2. 3 times (Ans)

3. 16 times

4. 8 times

263. For a deep beam whose overall depth is 5 m and effective span is 6 m , the lever arm for simply supported beam and continuous beam respectively will be

  1. 3.2m and 2.7m (Ans)

2. 3.6m and 3.0m

3. 2.7m and 3.2m

4. 3.0m and 3.6m

264. The purpose of lateral ties in short RC column is to,

  1. Avoid buckling of longitudinal loads (Ans)

2. Facilitate of construction

3. Facilitate compaction of concrete

4. Increase the load carrying capacity of the column

265. The side face reinforcement , if required in a T beam will be,

  1. 0.1% of the web be (Ans)

2. 0.15% of the web area

3. 0.02% 0.3% of the web area depending upon the breadth of the web

4. Half the longitudinal reinforcement

266. Deep beam are designed for

  1. Shear force only

2. Bending moment only (Ans)

3. Both shear force and bending moment

4. Bearing

267. In a check for development length (Ld) , Ld shall not exceed  M1 / V+L0 where M1 is moment of resistance of the section after bar curtailment, V is maximum shear in the region of M1 and L0 at the discontinuous edge is,

  1. Equal to 12 ɸ(ɸ is the diameter of the bar) or effective depth d wich ever s greater (Ans)

2. Actual anchorage length provided beyond centre of support

3. Straight length of bar beyond centre of support plus the hook or bend allowance if provided.

4. Ld /3

267. Multimate  of a singly reinforced balanced RC rectangular beam section is

  1. 0.115 fck bd2

2. 0.135 fck bd2 (Ans)

3. 0.185 fck bd2

4. 0.225 fck bd2

268. Limit state of serviceability of prestressed concrete section should satisfy

  1. Cracking, deflection and maximum compression (Ans)

2. Cracking only

3. Deflection and cracking

4. Declection and maximum compression

  269. At limit state of collapse in shear incase of web shear cracks , it is assumed that the concrete cracks when the maximum principle tensile stresses exceeds a value of ft  equal to

  1. 0.25√ fck (Ans)

2. 0.25√ fck

3. 0.25√ fck

4. 0.25√ fck

270. The load to be taken corresponding to limit states of strength , deflection and crack width are respectively

  1. Working load, working load and working load

2. Ultimate load , working load and ultimate load

3. Ultimate load, ultimate loadand working load

3. Ultimate load, ultimate load and working load (Ans)

  271. The loss of prestress due to shrinkage in concrete is the product of

  1. Modular ratio and percentage of steel

2. Modulus of elasticity of concrete and shrinkage of concrete

3. Modulus of elasticity of steel and shrinkage of concrete (Ans)

4. Modular ratio and modulus of elasticity of steel

272. Minimum clear cover to the main steel bars in slab beam , column and footing respectively are,

  1. 10,15,20,25

2. 15,25,40,75 (Ans)

3. 20,25,30,40

4. 20,35,40,75

273. The main reinforcement of RC slab consists of 10 mm bars at 10 cm spacing . If it is desired to replace 10mm bars by 12mm bars by 12mm bars , then the spacing of 12mm bars should be

  1. 12 cm

2. 14 cm

3. 14.40 cm (Ans)

4. 16 cm

274. Torsion testing capacity of a given RC section

  1. Decreases with decrease in stirrup spacing

2. Decrease with increase in longitudinal bars

3. Does not depend upon stirrup and longitudinal steel

4. Increase with the increase in stirrup and longitudinal steels (Ans)

275. If a simply supported concrete beam , prestress with a force of 2500KN , is designed by load balancing concept for an effective span of 10 m and to carry a total load of  40KN/m , the central dip of the cable profile should be,

  1. 100mm

2. 200mm (Ans)

3. 300mm

4. 400mm

276. Limit state of serviceability of deflection including the effects due to creep , shrinkage and temperature occurring after erection of partition and application  of finishes as applicable to floors and roof is restricted to

  1. Span/150

2. Span/200

3. Span/250

4. Span/350 (Ans)

277. From limiting deflection point of view , use of high strength steel in RC beam result in

  1. Reduction in depth

2. No change in depth

3. Increase in depth (Ans)

4. Increase in width

278. For maximum sagging bending moment at support in a continuous RC beam , live load should be placed on

  1. Span adjacent to the support plus alternate spans

2. All the spans except the spans adjacent to the support

3. Span next to the adjacent spans of the support plus alternate spans (Ans)

4. Span adjacent to support only

279. Design of one way RC slabs for concentrated load is done by

  1. Using pigeauds moment coefficient

2. Taking slab strip of unit with containing the load

3. Taking slab strip of width effective in resting the load (Ans)

4. Taking orthogonal slab strips of unit width containg the load

280. Shear span is defined as the zone where,

  1. Bending moment is zero

2. Shear force zero

3. Shear force is constant (Ans)

4. Bending moment is constant

 281. The reduction co efficient of a reinforced concrete column with an effective length of 4.8 m and size 250mm X 300mm is,

  1. 0.80

2. 0.85 (Ans)

3. 0.90

4. 0.95

282. The final deflection due to all loads , including the effects of temperature, creep and shrinkage and measured from as-case level of support of floors , roof and all other horizontal members should not exceed

  1. Span/350

2. Span/300

3. Span/250 (Ans)

4. Span/200

 283. In the design of two way slab restrained at all edges, torsional reinforcement required is

  1. 0.75 times the area of the steel provided at midspan in the same direction

2. 0.375 times the area of steel provided at mid span in the same direction

3. 0.375 times the area of steel provided at  in the shorter span

4. Nil (Ans)

284. At the time of initial tensioning , the maximum tensile stress in tendon immediately behind the anchorage shall not exceed

  1. 50% of the ultimate tensile strength of the wire or bar or strand

2. 80%  of the ultimate tensile strength of the wire or bar or strand (Ans)

3. 40% of the ultimate tensile strength of the wire or bar or strand

4. 60% of the ultimate tensile strength of the wire or bar or strand

285. A reinforced cantilever beam of span 4m , has a cross section of 150 X 500 mm . If checked for lateral stability and deflection , the beam will

  1. Fail in deflection only

2. Fail in lateral stability only

3. Fail in both deflection and stability (Ans)

4. Satisfy the requirements of deflection and lateral stability

  286. Negative moment in reinforced concrete beams at the location of supports is generally much higher than the positive span moment. This is primarily due to curvature at the support being,

  1. Very high (Ans)

2. Very low

3. Zero

4. Or reserving nature

287. The theoretical failure load of the beam for attainment of limit state of collapse in flexure is

  1. 23.7 KN

2. 25.6 KN

3. 28.7 KN

4. 31.6 KN (Ans)

  288. Ignoring the presence of tension reinforcement, find the value of load P in KN when the first flexure crack will develop in the beam

  1. 4.5

2. 5.0

3. 6.6 (Ans)

4. 7.5

289. The state of the two dimensional s-tress acting on a concrete lamina consists of a direct tensile stress , бs = 1.5 N/mm2 , and shear stress ζ = 1.20 N/mm2 , which cause cracking of concrete . Then the tensile strength of the concrete N/mm2 is

  1. 1.50

2. 2.08

3. 2.17 (Ans)

4. 2.29

290. Top ring beam of an Intze tank carries a hoop tension of 120 KN . The beam crosssection is 250 mm wide and 400 mm deep and it is reinforced with 4 bars of 20mm diameter  of FE 415 grade .Modular ratio of the concrete is 10 . The tensile stress in N/mm2 in the concrete is

  1. 1.02

2. 1.07 (Ans)

3. 1.20

4. 1.32

291. Maximum strain in an extreme fibre in concrete and in the tension reinforcement (Fe 415 and Es=200 KN/mm2) in balance section at limit state of flexure are respectively

  1. 0.0035 and 0.0038 (Ans)

2. 0.002 and 0.0018

3. 0.0035 and 0.0041

4. 0.002 and 0.0031

292. The working stress method of design specifies the value of modular ratio, m=280/(3бcbc), where бcbc is the allowable stress in bending compression in concrete.To what extent does the above value of m make any allowance for the creep in concrete?

  1. No compensation

2. Full compensation

3. Partial compensation (Ans)

4. The two are unrelated

293. Lateral ties in RC column are provided to resist

  1. Bending moment

2. Shear

3. Buckling of longitudinal steel bars (Ans)

4. Both bending moment and shear

294. For maximum sagging bending moment in a given span of a multiple span beam

  1. Every span as well as alternate spans are loaded (Ans)

2. Adjacent spans are loaded

3. Span adjoining this span are loaded

4. Adjacent spans are unloaded and next spans are loaded

295. In post tensioned prestressed concrete beam , the end block zone is the between the end of the beam and the section where,

1.No lateral stress exists

2. Only longitudinal stress exist (Ans)

3. Only shear stress exist

4. The shear stresses are maximum

296. According to Whitneys theory, the maximum depth of concrete stress block in a balanced RCC beam section of depth “d”  is

  1. 0.3d

2. 0.43d

3. 0.5d

4. 0.53d (Ans)

297. Partial safety for concrete and steel  are 1.5 and 1.15 respectively, because

  1. Concrete is heterogeneous while steel is homogeneous

2. The control on the quality of concrete is not as good as that of steel (Ans)

3. Concrete is week in tension

4. Voids in concrete are 0.5% while those in steel are 0.15%

298. The propagation of a shear crack in aprestressed concrete member depends on

  1. Tensile reinforcement

2. Compressive reinforcement

3. Shear reinforcement

4. Shape of the cross section of the beam (Ans)

299. As compared to working stress method of design , limit state method takes concrete to

  1. A higher stress level (Ans)

2. A lower stress level

3. The same stress level

4. Some times higher but generally lower stress level

300. The yield line theory is a

  1. Lower bound method of design of over reinforced slabs

2. Parabolic above the neutral axis

3. Linearly varying as the distance from the neutral axis (Ans)

4. Dependent on the magnitude of shear reinforcement provided

  301. For a reinforced concrete beam section the shape of the shear stress diagram is

  1. Parabolic over the whole section with maximum value at the neutral axis

2. Parabolic above the neutral axis and rectangular below the neutral axis (Ans)

3. Linearly varying as the distance from the neutral axis

4. Dependent on the magnitude of shear reinforcement provided

302. In a reinforced T beam the position of neutral axis

  1. Be within the flange

2. Be within the web

3. Depend on the thickness of flange in relation to total depth and percentage of reinforcement (Ans)

4. At the junction of flange and web

303. In a axially loaded spirally reinforced short column, the concrete inside the core is subjected to

  1. Bending and compression (Ans)

2. Biaxial compression

3. Triaxial compression

4. Uniaxial compression

304. If the loading of a simply supported  prestressed concrete beam  is uniformly distributed , the centroid of tendons should be preferably

  1. A straight profile along the centroidal axis

2. A straight profile along with the lower kern

3. A parabolic profile with convexity downward  (Ans)

4. A circular profile with convexity upward

305. In the design of a masonary retaining wall , the

  1. Vertical load should fall within the middle tird of base width

2. Horizontal thurst should act at  h/3 from base

3. Resultant load should fall within a distance of one-sixth of  base width on either side of its midpoint (Ans)

4. Resultant load should fall within a distance of one – eight of base widthon either side of its midpoint

306. In case of deep beam or in thin webbed  R.C.C members, the first crack form is

  1. Flexural crack (Ans)

2. Diagonal crack due to comprssion

3. Diagonal crack due to tension

4. Shear crack

307. The stress block in concrete for an estimate of ultimate strength in flexure of a prestressed beam

  1. Should be parabolic

2. Should be parabolic – rectangular

3. Should be rectangular

4. May be of ary shape which provides agreement with the test data (Ans)

308. The chances of diagonal tension cracks in R.C.C member reduce when ,

  1. Axial compression and shear force act simultaneously

2. Axial tension and shear force act simultaneously (Ans)

3. Only shear force act

4. Flexural and shear force act simultaneously

309. The probability of failure implied in limit state design  is of the order of

  1. 10-2

2. 10-3 (Ans)

3. 10-4

4. 10-5

  310. Cross sectional area of the metal core in composite column should not be more than

  1. 4%

2. 8%

3. 16%

4. 20% (Ans)

311. When the tendon of a rectangular prestressed beam of cross sectional area A is subjected to a load  W through the centroidal longitudinal axis of beam, ( where M= maximum bending moment and ,Z = section modulus) then the maximum stress in the beam section will be

  1. W/Z – M/Z

2. W/A +M/Z (Ans)

3. A/W – M/Z

4. A/W + Z/M

312. Which of the following deformations are important in case of deep beams whencompare to flexure alone?

  1. Shear (Ans)

2. Axial

3. Torsional

4. Bearing

313. Concordant cable profile is

  1. A cable profile that produces no support reactions due to pre stressing (Ans)

2. A cable profile which is parabolic in nature

3. A cable profile which produces no bending moment at the support of a beam

4. A cable profile laid corresponding t axial stress diagram

314. A ordinary mild steel bar has been prestress to working stress of 200MPa . Young modulus of steel is 200 GPa . Peramanent negative strain due to shrinkage and creep is 0.0008. How much of the effective stress left in the steel ?

  1. 184 MPa

2. 160MPa

3. 40MPa (Ans)

4. 16Mpa

315. The profile of the centroid of the tendon is parabolic with the centroidal dip h . Effective prestressing force is P and the span l.What is the equivalent upward acting uniform load?

  1. 8hl/P

2. 8hP/l2 (Ans)

3. 8h2l/P

4. 8h2P/l

316. At beams behaves as a rectangular beam of width equal to its flange if its neutral axis

  1. Coincides with centroid of reinforcement

2. Coincides with centroid of T section

3. Remains within the flange (Ans)

4. Remains in the web

317. An axially loaded column is of 300 X 300 mm size. Effective length of column is 3 m. What is the minimum eccentricity of the axial load for the column?

  1. 0

2. 10mm

3. 16mm

4. 20mm (Ans)

318. The distance between theoretical cut off point and actual cut off point in respect of the curtailment of reinforcement of reinforced concrete beams should not be less than

  1. Development length

2. 12 X dia of bar or effective depth which ever is greater (Ans)

3. 24 X  dia of bar or effective depth which ever is greater

4. 30 X dia of bar or effective depth which ever is greater

319. A square column section of size 350 X 350 mm in reinforced with four bars of 25 mm diameter and four bars of 16mm diameter.Then the transverse steel should be ,

  1. 5mm dia @ 240mm c/c

2. 6mm dia @ 250mm c/c

3. 8mm dia @ 250 mm c/c (Ans)

4. 8mm dia @ 350 mm c/c

320. What is the effective height  of a free standing masonary wall for the purpose of computing slenderness ratio ?

  1. 0.5 L

2. 1.0 L

3. 2.0 L (Ans)

4. 2.5 L

321. Hich of the following method is employed to manufacture pre stress concrete sleeper for the railways?

  1. Post tensioning

2. Pre tensioning (Ans)

3. Pre tensioning followed by post tensioning

4. Partial prestressing

322. What is the number of longitudinal bars provided in a reinforced concrete  column of circular cross section?

  1. 4

2. 5

3. 6 (Ans)

4. 8

323. Drop panel is a structural component in

  1. Grid floor

2. Flat plate (Ans)

3. Flat slab

4. Slab beam system of floor

324. Which of the following system of pre stressing is suitable for pretensioned members?

  1. Freyssinet system

2. Magnel Blaton system

3. Hoyer system (Ans)

4. Gifford Udall system

325. When is a masonary wall known as shear wall?

  1. If the earth quake load is out of plane

2. If the earth quake load is in plane (Ans)

3. If it is unreinforced

4. If it is placed as infill to the frame

326. What is the number of categories into which masonary buildings are divided on the basis of earth quake resistance feature?

  1. 5 (Ans)

2. 4

3. 3

4. 2

327. On which one of the following concepts is the basic principle of structural design based?

  1. Weak column strong beam

2. Strong column and weak beam (Ans)

3. Equally strong column – beam

4. Partial weak column beam

328. In the limit state design of pre stressed concrete structures  the strain distribution is assumed to be

  1. Linear  (Ans)

2. Non linear

3. Parabolic

4. Parabolic and Rectangular

329. In prestressed concrete , high grade of concrete is used for,

  1. Controlling the prestress loss

2. Having concrete of low ductility

3. Having  concrete of high brittleness

4. Having low creep (Ans)

330. In pre tensioning process of pre stressing the tendons are ,

  1. Bonded to the concrete (Ans)

2. Partially bonded to the concrete

3. Not bonded to the concrete

4. Generally bonded but some times remain unbounded to the concrete

331. In a pedestal, the factor by which the effective length  should not exceed the least lateral dimension is

  1. 2

2. 3 (Ans)

3. 4

4. 5

332. Deck bridges have the main disadvantages that,

  1. Their compression flanges have no lateral support

2. The traffic is exposed to winds

3. It is not possible to provide portal bracings

4. The road level has to be very high (Ans)

333. The maximum deflection in timber beams or joints should not be greater than,

  1. Span/300

2. Span/325

3. Span/360

4. Span/380 (Ans)

334. A compression member has a centre to centre length of 4m. It is fixed at one end and hinged at other end .The effective length of the column is,

  1. 4m

2. 2m

3. 2.8m (Ans)

4. 2.6m