RCC Structures Design MCQ Questions & Answers

RCC Structures Design MCQs : This section focuses on the "RCC Structures Design". These Multiple Choice Questions (MCQs) should be practiced to improve the RCC Structures Design skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

A short column 20 cm x 20 cm in section is reinforced with 4 bars whose area of cross section is 20 sq. cm. If permissible compressive stresses in concrete and steel are 40 kg/cm2 and 300 kg/cm2, the Safe load on the column, should not exceed

A. 4120 kg

B. 41, 200 kg

C. 412, 000 kg

D. none of these.

Question 2

A continuous beam shall be deemed to be a deep beam if the ratio of effective span to overall depth, is

A. 2.5

B. 2

C. less than 2

D. less than 2.5

Question 3

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, rein forcement is provided at the bottom of the slab

C. In the heel slab of a retaining wall, rein forcement is provided at the top of the slab

D. None of these.

Question 4

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

A. supports

B. mid span

C. every section

D. quarter span.

Question 5

Thickened part of a flat slab over its supporting column, is technically known as

A. drop panel

B. capital

C. column head

D. none of these.

Question 6

The maximum area of tension reinforcement in beams shall not exceed

A. 0.15%

B. 1.50%

C. 4%

D. 1%

Question 7

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. R2 + T2

D. R-T

Question 8

The reinforced concrete beam which has width 25 cm, lever arm 40 cm, shear force 6t/cm2, safe shear stress 5 kg/cm2 and B.M. 24 mt,

A. is safe in shear

B. is unsafe in shear

C. is over safe in shear

D. needs redesigning.

Question 9

According to I.S. : 456 specifications, the safe diagonal tensile stress for M 150 grade concrete, is

A. 5 kg/cm2

B. 10 kg/cm2

C. 15 kg/cm2

D. 20 kg/cm2

Question 10

If the permissible compressive stress for a concrete in bending is C kg/m2, the modular ratio is

A. 2800/C

B. 2300/2C

C. 2800/3C

D. 2800/C2

Question 11

Pick up the correct statement from the following:

A. A pile is a slender member which transfers the load through its lower end on a strong strata

B. A pile is a slender member which transfers its load to the surrounding soil

C. A pile is a slender member which transfers its load by friction

D. A pile is a cylindrical body of concrete which transfers the load at a depth greater than its width.

Question 12

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

A. 2R + T = 60

B. R + 2T = 60

C. 2R + T = 30

D. R + 2T= 30

Question 13

Cantilever retaining walls can safely be used for a height not more than

A. 3 m

B. 4 m

C. 5 m

D. 6 m

Question 14

The number of treads in a flight is equal to

A. risers in the flight

B. risers plus one

C. risers minus one

D. none of these.

Question 15

The effective width of a column strip of a flat slab, is

A. one-fourth the width of the panel

B. half the width of the panel

C. radius of the column

D. diameter of the column

Question 16

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

A. rectangular columns is 4

B. circular columns is 6

C. octagonal columns is 8

D. all the above.

Question 17

The percentage of minimum reinforcement of the gross sectional area in slabs, is

A. 0.10%

B. 0.12%

C. 0.15%

D. 0.18%

Question 18

For initial estimate for a beam design, the width is assumed

A. 1/15th of span

B. 1/20th of span

C. 1/25th of span

D. 1/30th of span

Question 19

As per I.S. 456 - 1978, the pH value of water shall be

A. less than 6

B. equal to 6

C. not less than 6

D. equal to 7

Question 20

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.

Question 21

The diameter of longitudinal bars of a column should never be less than

A. 6 mm

B. 8 mm

C. 10 mm

D. 12 mm

Question 22

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

A. 5 kg/cm2

B. 10 kg/cm2

C. 15 kg/cm2

D. 20 kg/cm2

Question 23

The width of the flange of a T-beam should be less than

A. one-third of the effective span of the T-beam

B. distance between the centres of T-beam

C. breadth of the rib plus twelve times the thickness of the slab

D. least of the above.

Question 24

Bottom bars under the columns are extended into the interior of the footing slab to a distance greater than

A. 42 diameters from the centre of the column

B. 42 diameters from the inner edge of the column

C. 42 diameters from the outer edge of the column

D. 24 diameter from the centre of the column

Question 25

For a circular slab carrying a uniformly distributed load, the ratio of the maximum negative to maximum positive radial moment, is

A. 1

B. 2

C. 3

D. 4

Question 26

Design of a two way slab simply supported on edges and having no provision to prevent the corners from lifting, is made by

A. Rankine formula

B. Marcus formula

C. Rankine Grashoff formula

D. Grashoff formula

Question 27

The amount of reinformcement for main bars in a slab, is based upon

A. minimum bending moment

B. maximum bending moment

C. maximum shear force

D. minimum shear force.

Question 28

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

A. one half of the width of the stem at the bottom

B. one-third of the width of the stem at the bottom

C. one fourth of the width of the steam at the bottom

D. width of the stem at the bottom

Question 29

If the effective length of a 32 cm diameter R.C.C. column is 4.40 m, its slenderness ratio, is

A. 40

B. 45

C. 50

D. 55

Question 30

A foundation rests on

A. base of the foundation

B. subgrade

C. foundation soil

D. both (b) and (c)

Question 31

If the average bending stress is 6 kg/cm2 for M 150 grade concrete, the length of embedment of a bar of diameter d according to I.S. 456 specifications, is

A. 28 d

B. 38 d

C. 48 d

D. 58 d

Question 32

An R.C.C. beam not provided with shear reinforcement may develop cracks in its bottom inclined roughly to the horizontal at

A. 25°

B. 35°

C. 45°

D. 55°

Question 33

The minimum cube strength of concrete used for a prestressed member, is

A. 50 kg/cm2

B. 150 kg/cm2

C. 250 kg/cm2

D. 350 kg/cm2

Question 34

The effective span of a simply supported slab, is

A. distance between the centres of the bearings

B. clear distance between the inner faces of the walls plus twice the thickness of the wall

C. clear span plus effective depth of the slab

D. none of these.

Question 35

Post tensioning system

A. was widely used in earlier days

B. is not economical and hence not generally used

C. is economical for large spans and is adopted now a days

D. none of these.

Question 36

Dimensions of a beam need be changed if the shear stress is more than

A. 10 kg/cm2

B. 15 kg/cm2

C. 20 kg/cm2

D. 25 kg/cm2

Question 37

In a combined footing if shear stress exceeds 5 kg/cm2, the nominal stirrups provided are:

A. 6 legged

B. 8 legged

C. 10 legged

D. 12 legged

Question 38

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

A. 30

B. 35

C. 40

D. 50

Question 39

In a prestressed beam carrying an external load W with a bent tendon is having angle of inclination θ and prestressed load P. The net downward load at the centre is

A. W - 2P cos θ

B. W - P cos θ

C. W - P sin θ

D. W - 2P sin θ