RCC Structures Design MCQ Questions & Answers

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

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Answer & Solution

Answer: Option C

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2

In a slab, the pitch of the main reinforcement should not exceed its effective depth

A) Three times B) Four times C) Five times D) Two times

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Answer & Solution

Answer: Option A

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3

If ‘A’ is the sectional area of a pre-stressed rectangular beam provided with a tendon pre-stressed by a force ‘P’ through its centroidal longitudinal axis, the compressive stress in concrete, is

A) $$\frac{{\text{P}}}{{\text{A}}}$$ B) $$\frac{{\text{A}}}{{\text{P}}}$$ C) $$\frac{{\text{P}}}{{2{\text{A}}}}$$ D) $$\frac{{2{\text{A}}}}{{\text{P}}}$$

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Answer & Solution

Answer: Option A

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4

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

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Answer & Solution

Answer: Option B

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5

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/cm² respectively. If m = 15, the depth of its neutral axis is

A) 20 cm B) 25 cm C) 30 cm D) 35 cm

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Answer & Solution

Answer: Option C

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6

If the modular ratio is ‘m’, steel ratio is ‘r’ and overall depth of a beam is ‘d’, the depth of the critical neutral axis of the beam, is

A) $$\frac{{\text{m}}}{{{\text{m}} - {\text{r}}}} \times {\text{d}}$$ B) $$\frac{{\text{m}}}{{{\text{m}} + {\text{r}}}} \times {\text{d}}$$ C) $$\frac{{{\text{m}} + {\text{r}}}}{{\text{m}}} \times {\text{d}}$$ D) $$\frac{{{\text{r}} - {\text{m}}}}{{\text{m}}} \times {\text{d}}$$

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Answer & Solution

Answer: Option B

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7

In a beam the local bond stress S_b, is equal to

A) $$\frac{{{\text{Shear force}}}}{{{\text{Leaver arm}} \times {\text{Total perimeter of reinforcement}}}}$$ B) $$\frac{{{\text{Total perimeter of reinforcement}}}}{{{\text{Leaver arm}} \times {\text{Shear force}}}}$$ C) $$\frac{{{\text{Leaver arm}}}}{{{\text{Shear force}} \times {\text{Total perimeter of reinforcement}}}}$$ D) $$\frac{{{\text{Leaver arm}}}}{{{\text{Bending moment}} \times {\text{Total perimeter of reinforcement}}}}$$

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Answer & Solution

Answer: Option A

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8

The angle of internal friction of soil mass is the angle whose

A) Tangent is equal to the rate of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane B) Sine is equal to the ratio of the maximum resistance to sliding on any internal inclined plane to the normal pressure acting on the plane C) Cosine is equal to the ratio of the maximum resistance sliding on any internal inclined plane to the normal pressure acting on the plane D) None of these

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Answer & Solution

Answer: Option A

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9

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

A) $${\frac{1}{8}^{{\text{th}}}}$$ of the span B) $${\frac{1}{{10}}^{{\text{th}}}}$$ of the span C) $${\frac{1}{{12}}^{{\text{th}}}}$$ of the span D) $${\frac{1}{{16}}^{{\text{th}}}}$$ of the span

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Answer & Solution

Answer: Option C

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10

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

A) Under-reinforced section B) Over reinforced section C) Economic section D) Critical section

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Answer & Solution

Answer: Option B

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RCC Structures Design MCQ Questions & Answers | Civil Engineering