RCC Structures Design Mcqs - Set 6

1)   A reinforced concrete cantilever beam is 3.6 m long, 25 cm wide and has its lever arm 40 cm. It carries a load of 1200 kg at its free end and vertical stirrups can carry 1800 kg. Assuming concrete to carry one-third of the diagonal tension and ignoring the weight of the beam, the number of shear stirrups required, is___________________?

a. 30
b. 35
c. 40
d. 45
Answer  Explanation 

ANSWER: 40

Explanation:
No explanation is available for this question!


2)   A ribbed slab is provided for______________?

a. A plain ceiling
b. Thermal insulation
c. Acoustic insulation
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


3)   To ensure that the hogging bending moment at two points of suspension of a pile of length L equals the sagging moment at its centre, the distances of the points of suspension from either end, is________________?

a. 0.107 L
b. 0.207 L
c. 0.307 L
d. 0.407 L
Answer  Explanation 

ANSWER: 0.207 L

Explanation:
No explanation is available for this question!


4)   The width of the rib of a T-beam, is generally kept between_______________?

a. 1/7 to 1/3 of rib depth
b. 1/3 to 1/2 of rib depth
c. 1/2 to 3/4 of rib depth
d. 1/3 to 2/3 of rib depth
Answer  Explanation 

ANSWER: 1/3 to 2/3 of rib depth

Explanation:
No explanation is available for this question!


5)   For the design of a simply supported T-beam the ratio of the effective span to the overall depth of the beam is limited to______________?

a. 10
b. 15
c. 25
d. 20
Answer  Explanation 

ANSWER: 20

Explanation:
No explanation is available for this question!


6)   is the pre-stressed force applied to the tendon of a rectangular pre-stressed beam whose area of cross section is and sectional modulus is . The maximum stress in 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  Explanation 

ANSWER: f = (P/A) + (M/Z)

Explanation:
No explanation is available for this question!


7)   The stresses developed in concrete and steel in reinforced concrete beam 25 cm width and 70 cm effective depth, are 62.5 kg/cm2 and 250 kg/cm 2 respectively. If m = 15, the depth of its neutral axis is_______________?

a. 20 cm
b. 25 cm
c. 30 cm
d. 35 cm
Answer  Explanation 

ANSWER: 30 cm

Explanation:
No explanation is available for this question!


8)   If the depth of actual neutral axis of a doubly reinforced beam______________?

a. Is greater than the depth of critical neutral axis, the concrete attains its maximum stress earlier
b. Is less than the depth of critical neutral axis, the steel in the tensile zone attains its maximum stress earlier
c. Is equal to the depth of critical neutral axis; the concrete and steel attain their maximum stresses simultaneously
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


9)   The maximum diameter of a bar used in a ribbed slab, is______________?

a. 12 mm
b. 6 mm
c. 20 mm
d. 22 mm
Answer  Explanation 

ANSWER: 22 mm

Explanation:
No explanation is available for this question!


10)   A column is regarded as long column if the ratio of its effective length and lateral dimension, exceeds_________________?

a. 10
b. 15
c. 20
d. 25
Answer  Explanation 

ANSWER: 15

Explanation:
No explanation is available for this question!


11)   The breadth of a ribbed slab containing two bars must be between______________?

a. 6 cm to 7.5 cm
b. 8 cm to 10 cm
c. 10 cm to 12 cm
d. 12 cm to 15 cm
Answer  Explanation 

ANSWER: 8 cm to 10 cm

Explanation:
No explanation is available for this question!


12)   If the diameter of the main reinforcement in a slab is 16 mm, the concrete cover to main bars is_____________?

a. 10 mm
b. 12 mm
c. 14 mm
d. 16 mm
Answer  Explanation 

ANSWER: 16 mm

Explanation:
No explanation is available for this question!


13)   According to the steel beam theory of doubly reinforced beams______________?

a. Tension is resisted by tension steel
b. Compression is resisted by compression steel
c. Stress in tension steel equals the stress in compression steel
d. All the above
Answer  Explanation 

ANSWER: All the above

Explanation:
No explanation is available for this question!


14)   The stem of a cantilever retaining wall which retains earth level with top is 6 m. If the angle of repose and weight of the soil per cubic metre are 30° and 2000 kg respectively, the effective width of the stem at the bottom, is_______________?

a. 51.5
b. 52.5
c. 53.5
d. 54.5
Answer  Explanation 

ANSWER: 53.5

Explanation:
No explanation is available for this question!


15)   Minimum spacing between horizontal parallel reinforcement of different sizes, should not be less than________________?

a. One diameter of thinner bar
b. One diameter of thicker bar
c. Twice the diameter of thinner bar
d. None of these
Answer  Explanation 

ANSWER: One diameter of thicker bar

Explanation:
No explanation is available for this question!


16)   A singly reinforced concrete beam of 25 cm width and 70 cm effective depth is provided with 18.75 cm2 steel. If the modular ratio (m) is 15, the depth of the neutral axis, is_________________?

a. 20 cm
b. 25 cm
c. 30 cm
d. 35 cm
Answer  Explanation 

ANSWER: 30 cm

Explanation:
No explanation is available for this question!


17)   In testing a pile by load test, pile platform is loaded with one and half times the design load and a maximum settlement is noted. The load is gradually removed and the consequent rebound is measured. For a safe pile, the net settlement (i.e. total settlement minus rebound) per tonne of test load should not exceed________________?

a. 10 mm
b. 15 mm
c. 20 mm
d. 25 mm
Answer  Explanation 

ANSWER: 25 mm

Explanation:
No explanation is available for this question!


18)   An intermediate T-beam reinforced with two layers of tensile steel with clear cover 13 cm encasted with the floor of a hall 12 metres by 7 metres, is spaced at 3 metres from adjoining beams and if the width of the beam is 20 cm, the breadth of the flange is__________________?

a. 300 cm
b. 233 cm
c. 176 cm
d. 236 cm
Answer  Explanation 

ANSWER: 176 cm

Explanation:
No explanation is available for this question!


19)   The diameter of main bars in R.C.C. columns, shall not be less than________________?

a. 6 mm
b. 8 mm
c. 10 mm
d. 12 mm
Answer  Explanation 

ANSWER: 12 mm

Explanation:
No explanation is available for this question!


20)   Based on punching shear consideration, the overall depth of a combined footing under a column A, is_______________?

a. (Area of the column A × Safe punching stress)/Load on column A
b. (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)
c. (Perimeter of column A × Safe punching stress)/(Load on column A × Upward pressure × Area of the column)
d. None of these
Answer  Explanation 

ANSWER: (Perimeter of column A × Safe punching stress)/(Load on column A + Upward pressure × Area of the column)

Explanation:
No explanation is available for this question!