In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

If C is creep coefficient, f is original pre-stress in concrete, m is modular ratio, E is Young's modulus of steel and e is shrinkage strain, the combined effect of creep and shrinkage is:

A

(1 - C) mf - eE

B

(C - 1) mf + eE

C

(C - 1) mf - eE

D

(1 - C) mf + eE

The section of a reinforced beam where most distant concrete fibre in compression and tension in steel attains permissible stresses simultaneously, is called

A

Balanced section

B

Economic section

C

Critical section

D

All the above

In a doubly-reinforced beam if ‘c’ and ‘t’ are stresses in concrete and tension reinforcement, ‘d’ is the effective depth and ‘n’ is depth of critical neutral axis, the following relationship holds good

A

$$\frac{{{\text{mc}}}}{{\text{t}}} = \frac{{\text{n}}}{{{\text{d}} - {\text{n}}}}$$

B

$$\frac{{{\text{m}} + {\text{c}}}}{{\text{t}}} = \frac{{\text{n}}}{{{\text{d}} + {\text{n}}}}$$

C

$$\frac{{{\text{t}} + {\text{c}}}}{{\text{m}}} = \frac{{{\text{d}} + {\text{n}}}}{{\text{n}}}$$

D

$$\frac{{\text{m}}}{{{\text{t}} + {\text{c}}}} = \frac{{\text{n}}}{{{\text{d}} - {\text{n}}}}$$

The moment of resistance of a balanced reinforced concrete beam is based on the stresses in

A

Steel only

B

Concrete only

C

Steel and concrete both

D

None of these

For concreting of heavily reinforced sections without vibration, the workability of concrete expressed as compacting factor should be

A

0.75 - 0.80

B

0.80 - 0.85

C

0.85 - 0.92

D

Above 0.92

Shrinkage allowance on pattern is provided to compensate for shrinkage when

A

The temperature of liquid metal drops from pouring to freezing temperature

B

The metal changes from liquid to solid state at freezing temperature

C

The temperature of solid phase drops from freezing to room temperature

D

The temperature of metal drops from pouring to room temperature

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A

Metal changes from liquid state to solid state at freezing temperature

B

Solid phase temperature drops from freezing temperature to the room temperature

C

Liquid metal temperature drops from pouring temperature to room temperature

D

Liquid metal temperature drops from pouring temperature to freezing temperature

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

A

$$\frac{{{\text{Shear force}}}}{{{\text{Lever arm}} \times {\text{Width}}}}$$

B

$$\frac{{{\text{Lever arm}}}}{{{\text{Shear force}} \times {\text{Width}}}}$$

C

$$\frac{{{\text{Width}}}}{{{\text{Lever arm}} \times {\text{Shear force}}}}$$

D

$$\frac{{{\text{Shear force}} \times {\text{Width}}}}{{{\text{Lever arm}}}}$$

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

A

Tensile strength

B

Compressive strength

C

Young's modulus

D

Thermal co-efficient of expansion

A square room has a square carpet symmetrically placed in it. This leaves an uncovered area of 9 meter2. The area of the whole romm is 25 meter2 . What is the length of the one side the carpet?

A

2 meter

B

4 meter

C

6 meter

D

8 meter

In symmetrically reinforced sections, shrinkage stresses in concrete and steel are respectively

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