RCC Structures Design Quiz | RCC Structures Design Objective Type Questions and Answers

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Questions
21 The spacing of transverse reinforcement of column is decided by the following consideration.
A The least lateral dimension of the column
B Sixteen times the diameter of the smallest longitudinal reinforcing rods in the column
C Forty-eight times the diameter of transverse reinforcement
D All the above

Answer: All the above
22 A pre-cast pile generally used, is
A Circular
B Square
C Octagonal
D Square with corners chamfered

Answer: Square with corners chamfered
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23 The neutral axis of a T-beam exists
A Within the flange
B At the bottom edge of the slab
C Below the slab
D All the above

Answer: All the above
24 An R.C.C beam of 25 cm width has a clear span of 5 metres and carries a U.D.L. of 2000 kg/m inclusive of its self weight. If the lever arm of the section is 45 cm., the beam is
A Safe in shear
B Is safe with stirrups
C Is safe with stirrups and inclined members
D Needs revision of the section

Answer: Safe in shear
25 The design of heel slab of a retaining wall is based on the maximum bending moment due to:
A Its own weight
B Weight of the soil above it
C Load of the surcharge, if any
D All the above

Answer: All the above
26 The minimum thickness of a flat slab is taken
A L/32 for end panels without drops
B L/36 for end panels without drops
C L/36 for interior panels without drop
D All the above

Answer: All the above
27 The minimum clear cover for R.C.C. columns shall be
A Greater of 40 mm or diameter
B Smaller of 40 mm or diameter
C Greater of 25 mm or diameter
D Smaller of 25 mm or diameter

Answer: Greater of 25 mm or diameter
28 An R.C.C. lintel is spanning an opening of 2 m span in a brick wall. The height of the roof is 2.9 m above the floor level and that of the opening is 2.1 m above the floor level. The lintel is to be designed for self weight plus
A Triangular load of the wall
B UDL of wall
C UDL of wall + load from the roof
D Triangular load + load from the roof

Answer: UDL of wall + load from the roof
29 In a pre-stressed member it is advisable to use
A Low strength concrete only
B High strength concrete only
C Low strength concrete but high tensile steel
D High strength concrete and high tensile steel

Answer: High strength concrete and high tensile steel
30 If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young’s modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:
A (1 – C) mf – eE
B (C – 1)mf + eE
C (C – 1)mf – eE
D (1 – C)mf + eE

Answer: (C – 1)mf + eE
31 Is the pre- stressed force applied to tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The minimum stress on the beam subjected to a maximum bending moment is
A f = (P/A) – (Z/M)
B f = (A/P) – (M/Z)
C f = (P/A) – (M/Z)
D f = (P/A) – (M/6Z)

Answer: f = (P/A) – (M/Z)
32 For M 150 grade concrete (1:2:4) the moment of resistance factor is
A 0.87
B 8.50
C 7.50
D 5.80

Answer: 8.50
33 Top bars are extended to the projecting parts of the combined footing of two columns Ldistance apart for a distance of
A 0.1 L from the outer edge of column
B 0.1 L from the centre edge of column
C Half the distance of projection
D One -fourth the distance of projection

Answer: 0.1 L from the centre edge of column
34 The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of
A 10 mm
B 15 mm
C 20 mm
D 25 mm

Answer: 25 mm
35 Steel bars are generally connected together to get greater length than the standard length by providing
A Straight bar splice
B Hooked splice
C Dowel splice
D All the above

Answer: All the above
36 Pick up the incorrect statement from the following: Tensile reinforcement bars of a rectangular beam
A Are curtailed if not required to resist the bending moment
B Are bent up at suitable places to serve as shear reinforcement
C Are bent down at suitable places to serve as shear reinforcement
D Are maintained at bottom to provide at least local bond stress

Answer: Are bent down at suitable places to serve as shear reinforcement
37 The maximum permissible size of aggregates to be used in casting the ribs of a slab, is
A 5 mm
B 7.5 mm
C 10 mm
D 15 mm

Answer: 10 mm
38 mutually perpendicular principal stresses acting on a soil mass, the normal stress If p1 and p2 are
A [(p – p p p to the principal plane carrying the principal stress p1, is:sin 2
B [(p – p p p cos 2
C [(p p p – p cos 2
D [(p p p – p /2] sin 2

Answer: [(p p p – p cos 2
39 longitudinal bars and lateral stirrups, is
A Stress in concrete × area of concrete
B Stress in steel × area of steel
C Stress in concrete × area of concrete + Stress in steel × area of steel
D None of these

Answer: Stress in concrete × area of concrete + Stress in steel × area of steel
40 To ensure uniform pressure distribution, the thickness of the foundation, is
A Kept uniform throughout
B Increased gradually towards the edge
C Decreased gradually towards the edge
D Kept zero at the edge

Answer: Decreased gradually towards the edge
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