The pile provided with one or more bulles in its vertical shaft, is generally known as

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

Two shafts A and B are made of the same material. The diameter of shaft A is twice as that of shaft B. The power transmitted by the shaft A will be __________ of shaft B.

A

Twice

B

Four times

C

Eight times

D

Sixteen times

The product of the tangential force acting on the shaft and its distance from the axis of the shaft (i.e. radius of shaft) is known as

A

Bending moment

B

Twisting moment

C

Torsional rigidity

D

Flexural rigidity

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

The natural frequency of free torsional vibrations of a shaft is equal to (where q = Torsional stiffness of the shaft and $$I$$ = Mass moment of inertia of the disc attached at the end of a shaft)

A

$$2\pi \sqrt {\frac{{\text{q}}}{I}} $$

B

$$2\pi \sqrt {{\text{q}}I} $$

C

$$\frac{1}{{2\pi }}\sqrt {\frac{{\text{q}}}{I}} $$

D

$$\frac{1}{{2\pi }}$$

The radius of a friction circle for a shaft rotating inside a bearing is (where r = Radius of shaft and $$\tan \varphi $$ = Coefficient of friction between the shaft and bearing)

A

$${\text{r}}\sin \varphi $$

B

$${\text{r}}\cos \varphi $$

C

$${\text{r}}\tan \varphi $$

D

$$\frac{{\text{r}}}{2}\cos \varphi $$

Pile foundation is generally provided if soil is

A

Compressible

B

Water logged

C

Made up

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 pile provided with one or more bulles in its vertical shaft, is generally known as

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