In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

If q is the punching shear resistance per unit area a, is the side of a square footing for a column of side b, carrying a weight W including the weight of the footing, the depth (D) of the footing from punching shear consideration, is

A

$${\text{D}} = \frac{{{\text{W}}\left( {{\text{a}} - {\text{b}}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

B

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{{\text{a}}^2}{\text{bq}}}}$$

C

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{8{{\text{a}}^2}{\text{bq}}}}$$

D

$${\text{D}} = \frac{{{\text{W}}\left( {{{\text{a}}^2} - {{\text{b}}^2}} \right)}}{{4{\text{abq}}}}$$

The minimum thickness of the cover at the end of a reinforcing bar should not be less than twice the diameter of the bar subject to a minimum of

A

10 mm

B

15 mm

C

20 mm

D

25 mm

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

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

To avoid the tearing off the plate of an edge, the margin (i.e., the minimum distance from the centre of the rivet hole to the nearest edge of the plate) should be equal to

A

0.5 d

B

D

C

1.5 d

D

2.5 d

Depth of lean concrete bed placed at the bottom of a wall footing, is kept

A

10 cm

B

15 cm

C

Equal to its projection beyond wall base

D

Less than its projection beyond wall base

L is older than M and taller than N. O is younger than P, older than N and shorter than Q. R is older than S, younger than N, shorter than S and taller than Q. S is older than L, M, O, P, Q, R and S is necessarily false?

A

O is the shortest of the group.

B

N is the second tallest of the group.

C

L is the tallest of the group.

D

Q is the third oldest of the group.

The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is

A

d > m > e

B

d > e > m

C

e > m > d

D

e > d > m

For a cylindrical shell, (subject to the thickness of uppermost course being more than the minimum for diaofthe tank in question), the thickness of the courses of shell

A

Decreases upwards

B

Increases upwards

C

Remains same throughout

D

May decrease or increase upwards depending upon whether vacuum or positive pressure would be maintained inside the shell

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

For heavily reinforced concrete member, the nominal maximum size of the aggregates should be restricted to

A

5 mm less than the minimum clear distance between the main bars

B

5 mm less than the minimum cover to the reinforcement

C

Smaller of A and B

D

Greater of A and B

In reinforced concrete footing on soil, the minimum thickness at edge should not be less than

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