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This set of RCC Structures Design Multiple Choice Questions & Answers (MCQs) focuses on Rcc Structures Design Set 8

Q1 | For M 150 mix concrete, according to I.S. specifications, local bond stress, is

- 5 kg/cm2
- 10 kg/cm2
- 15 kg/cm2
- 20 kg/cm2

Q2 | The minimum cube strength of concrete used for a pre-stressed member, is

- 50 kg/cm2
- 150 kg/cm2
- 250 kg/cm2
- 350 kg/cm2

Q3 | If d and n are the effective depth and depth of the neutral axis respectively of a singly reinforced beam, the lever arm of the beam, is

- d
- n
- d + n/3
- d - n/3

Q4 | The weight of a foundation is assumed as

- 5% of wallweight
- 7% of wallweight
- 10% of wall weight
- 12% of wallweight

Q5 | An R.C.C. column of 30 cm diameter is reinforced with 6 bars 12 mm placed symmetrically along the circumference. If it carries a load of 40, 000 kg axially, the stress is

- 49.9 kg/cm2
- 100 kg/cm2
- 250 kg/cm2
- 175 kg/cm2

Q6 | If the diameter of longitudinal bars of a square column is 16 mm, the diameter oflateral ties should not be less than

- 4 mm
- 5 mm
- 6 mm
- 8 mm

Q7 | Design of R.C.C. cantilever beams, is based on the resultant force at

- Fixed end
- Free end
- Mid span
- Mid span and fixed support

Q8 | In a combined footing if shear stress does not exceed 5 kg/cm2 , the nominal stirrups provided are

- 6 legged
- 8 legged
- 10 legged
- 12 legged

Q9 | The maximum shear stress (q) in concrete of a reinforced cement concrete beam is

- Shearforce/(Lever arm×Width)
- Lever arm/(Shearforce ×Width)
- Width/(Lever arm × Shearforce)
- (Shearforce × Width)/Lever arm

Q10 | An R.C.C. column is treated as long if its slenderness ratio is greater than

- 30
- 35
- 40
- 50

Q11 | The thickness of base slab of a retaining wall generally provided, is

- One half of the width of the stem at thebottom
- One-third of the width of the stem at the bottom
- One fourth of the width ofthe steam at the bottom
- Width of the stem at the bottom

Q12 | Design of R.C.C. simply supported beams carrying U.D.L. is based on the resultant B.M. at

- Supports
- Mid span
- Every section
- Quarter span

Q13 | If the maximum shear stress at the end of a simply supported R.C.C. beam of 6 m effective span is 10 kg/cm2 , the share stirrups are provided for a distance from either end where, is

- 50 cm
- 100 cm
- 150 cm
- 200 cm

Q14 | Distribution reinforcement in a simply supported slab, is provided to distribute

- Load
- Temperature stress
- Shrinkage stress
- All the above

Q15 | Distribution of shear intensity over a rectangular section of a beam, follows:

- A circular curve
- A straight line
- A parabolic curve
- An ellipticalcurve

Q16 | In a singly reinforced beam, if the permissible stress in concrete reaches earlier than that in steel, the beam section is called

- Under-reinforced section
- Over reinforced section
- Economic section
- Criticalsection

Q17 | If the size of a column is reduced above the floor, the main bars of the columns, are

- Continued up
- Bent inward at the floor level
- Stopped just below the floor level and separate lap barsprovided
- All the above

Q18 | The minimum number of main steel bars provided in R.C.C.

- Rectangular columns is 4
- Circular columns is 6
- Octagonal columns is 8
- All the above

Q19 | If T and R are tread and rise respectively of a stair, then

- 2R + T =60
- R + 2T = 60
- 2R + T = 30
- R + 2T = 30

Q20 | For stairs spanning l metres longitudinally between supports at the bottom and top of a flight carrying a load w per unit horizontal area, the maximum bending moment per metre width, is

- wl²/4
- wl²/8
- wl²/12
- wl²/16

Q21 | In a singly reinforced beam, the effective depth is measured from its compression edge to

- Tensile edge
- Tensile reinforcement
- Neutral axis of the beam
- Longitudinal centralaxis

Q22 | Though the effective depth of a T-beam is the distance between the top compression edge to the centre of the tensile reinforcement, for heavy loads, it is taken as

- 1/8th of the span
- 1/10th of thespan
- 1/12th of thespan
- 1/16th of thespan

Q23 | On piles, the drop must be at least

- 80 cm
- 100 cm
- 120 cm
- 140 cm

Q24 | Steel beam theory is used for

- Design of simple steel beams
- Steel beams encased in concrete
- Doubly reinforced beams ignoring compressive stress inconcrete
- Beamsifshear exceeds 4 times allowable shearstress

Q25 | In a pre-stressed beam carrying an external load W with a bent tendon is having angle of -stressed load P. The net downward load at the centre is

- W - 2P
- W - P
- W - P
- W - 2P