RCC Structures Design Quiz | RCC Structures Design Short Questions and Answers

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Questions
41 Side face reinforcement shall be provided in the beam when depth of the web in a beam exceeds
A 50 cm
B 75 cm
C 100 cm
D 120 cm

Answer: 75 cm
42 If is the sectional area of a pre-stressed rectangular beam provided with a tendon pre -stressed by a force through its centroidal longitudinal axis, the compressive stress in concrete, is
A P/A
B A/P
C P/2A
D 2A/P

Answer: P/A
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43 Enlarged head of a supporting column of a flat slab is technically known as
A Supporting end of the column
B Top of the column
C Capital
D Drop panel

Answer: Capital
44 The modular ratio m of a concrete whose permissible compressive stress is C, may be obtained from the equation.
A m = 700/3C
B m = 1400/3C
C m = 2800/3C
D m = 3500/3C

Answer: m = 2800/3C
45 If the permissible compressive and tensile stresses in a singly reinforced beam are 50 kg/cm2 and 1400 kg/cm2 respectively and the modular ratio is 18, the percentage area At of the steel required for an economic section, is
A 0.496 %
B 0.596 %
C 0.696 %
D 0.796 %

Answer: 0.696 %
46 If A is the area of the foundation of a retaining wall carrying a load W and retaining earth of weight w per unit volume, the minimum depth (h) of the foundation from the free surface of the earth, is )/(1 + sin )]
A h = (W/Aw) [(1 –
B h = (W/Aw) [(1 + )/(1 + sin )]
C h = (W/Aw) [(1 – )/(1 + sin )]²
D h W/Aw) [(1 – )/(1 + sin )]²

Answer: h = (W/Aw) [(1 – )/(1 + sin )]²
47 High strength concrete is used in pre-stressed member
A To overcome high bearing stresses developed at the ends
B To overcome bursting stresses at the ends
C To provide high bond stresses
D All the above

Answer: All the above
48 The pitch of the main bars in a simply supported slab, should not exceed its effective depth by
A Three times
B Four times
C Five times
D Six times

Answer: Six times
49 Long and short spans of a two way slab are l and l and load on the slab acting on strips parallel to lx and ly be wx and wy respectively. Accordingy to xRankine Grashoff theory
A (wx/wy) = (ly/lx)
B (wx/wy) = (ly/lx)²
C (wx/wy) = (ly/lx)4
D None of these

Answer: (wx/wy) = (ly/lx)4
50 The transverse reinforcements provided at right angles to the main reinforcement
A Distribute the load
B Resist the temperature stresses
C Resist the shrinkage stress
D All the above

Answer: All the above
51 In the zone of R.C.C. beam where shear stress is less than 5 kg/cm2, nominal reinforcement is provided at a pitch of
A One -half lever arm of the section
B One-third lever arm of the section
C Lever arm of the section
D One and half lever arm of the section

Answer: Lever arm of the section
52 If p1 and P2 are effective lateral loadings at the bottom and top exerted by a level earth subjected to a super-load on the vertical face of height h of a retaining wall, the horizontal pressure p per unit length of the wall, is
A [( – )/2] h
B [( + )/4] h
C [( + )/2] h
D ( – h

Answer: [( + )/2] h
53 If R and T are rise and tread of a stair spanning horizontally, the steps are supported by a wall on one side and by a stringer beam on the other side, the steps are designed as beams of width
A R + T
B T – R
C 2 + T2)
D R – T

Answer: 2 + T2)
54 In a simply supported slab, alternate bars are curtailed at
A 1/4th of the span
B 1/5th of the span
C 1/6th of the span
D 1/7th of the span

Answer: 1/7th of the span
55 After pre-stressing process is completed, a loss of stress is due to
A Shrinkage of concrete
B Elastic shortening of concrete
C Creep of concrete
D All the above

Answer: All the above
56 If the bearing capacity of soil is 10 tonnes/cm2 and the projection of plain concrete footing from walls, is a cm, the depth D of footing is
A D = 0.0775 a
B D = 0.775 a
C D = 0.775 a
D D = 0.775 a2

Answer: D = 0.775 a
57 Pick up the incorrect statement from the following:
A In the stem of a retaining wall, reinforcement is provided near the earth side
B In the toe slab of a retaining wall, reinforcement is provided at the bottom of the slab
C In the heel slab of a retaining wall, reinforcement is provided at the top of the slab
D None of these

Answer: None of these
58 The self-weight of the footing, is
A Not considered for calculating the upward pressure on footing
B Also considered for calculating the upward pressure on footing
C Not considered for calculating the area of the footing
D Both B. and C.

Answer: Not considered for calculating the upward pressure on footing
59 A pre-stressed rectangular beam which carries two concentrated loads W at L/3 from either end, is provided with a bent tendon with tension P such that central one-third portion of the tendon remains parallel to the longitudinal axis, the maximum dip h is
A WL/P
B WL/2P
C WL/3P
D WL/4P

Answer: WL/3P
60 The minimum head room over a stair must be
A 200 cm
B 205 cm
C 210 cm
D 230 cm

Answer: 210 cm

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