The compaction of concrete in the drilled pile hole is done by compressed air in the case of

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

The advantage of a concrete pile over a timber pile, is

A

No decay due to termites

B

No restriction on length

C

Higher bearing capacity

D

All the above

A pile of length ‘L’ carrying a uniformly distributed load ‘W’ per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is

A

$$\frac{{{\text{WL}}}}{8}$$

B

$$\frac{{{\text{W}}{{\text{L}}^2}}}{{24}}$$

C

$$\frac{{{\text{W}}{{\text{L}}^2}}}{{47}}$$

D

$$\frac{{{\text{W}}{{\text{L}}^2}}}{{16}}$$

A pile of length carrying a uniformly distributed load per metre length is suspended at two points, the maximum, B.M. at the centre of the pile or at the points of suspension, is

A

WL/8

B

WL2/24

C

WL2/47

D

WL2/16

A plate with an elliptical hole in the centre, with semi-major axis (a) perpendicular to the direction of loading and semi-minor axis (b) along the direction of loading, is subjected to a pull P. The maximum stress induced at the edge of the hole is equal to (where $$\sigma $$ = Stress for a plate with no hole i.e. nominal stress)

A

$$\sigma \left( {1 + \frac{{\text{b}}}{{2{\text{a}}}}} \right)$$

B

$$\sigma \left( {1 + \frac{{2{\text{a}}}}{{\text{b}}}} \right)$$

C

$$\sigma \left( {1 + \frac{{\text{b}}}{{3{\text{a}}}}} \right)$$

D

$$\sigma \left( {1 + \frac{{3{\text{a}}}}{{\text{b}}}} \right)$$

The hole to be drilled for tapping is _________ the outside diameter of the thread on the tap.

A

Equal to

B

Smaller than

C

Greater than

D

None of these

For riveting, the size of hole drilled in plates is __________ shank diameter of rivet.

A

Equal to

B

Less than

C

Greater than

D

None of these

A pre-stressed concrete pile is

A

Easy to handle

B

Lighter in weight

C

Extremely durable

D

All the above

The pile which is provided with a bulb filled with concrete at its lower end, is known as

A

Simplex pile

B

Mac-Arthur pile

C

Raymond pile

D

Franki pile

The taper of precast concrete pile should not be more than

A

1 cm per metre length

B

2 cm per metre length

C

4 cm per metre length

D

5 cm per metre length

The compaction of concrete in the drilled pile hole is done by compressed air in the case of

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