When the particles of a body moves perpendicular to its axis, then the body is said to have

A spherical body is symmetrical about its perpendicular axis. According to Routh's rule, the moment of inertia of a body about an axis passing through its centre of gravity is (where, M = Mass of the body and S = Sum of the squares of the two semi-axes.)

A

$$\frac{{{\text{MS}}}}{3}$$

B

$$\frac{{{\text{MS}}}}{4}$$

C

$$\frac{{{\text{MS}}}}{5}$$

D

None of these

In order to have a connecting rod equally strong in buckling about X-axis and Y-axis, the moment of inertia about X-axis should be __________ the moment of inertia about Y-axis.

A

Equal to

B

Twice

C

Three times

D

Four times

Longitudinal vibrations are said to occur when the particles of a body moves

A

perpendicular to its axis

B

parallel to its axis

C

in a circle about its axis

D

none of the mentioned

Torsional vibrations are said to occur when the particles of a body moves

A

Perpendicular to its axis

B

Parallel to its axis

C

In a circle about its axis

D

None of these

The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is

A

Same

B

Double

C

Half

D

Four times

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 moment of inertia of a thin rod of mass 'm' and length '$$l$$', about an axis through its centre of gravity and perpendicular to its length is

A

$$\frac{{{\text{m}}{l^2}}}{4}$$

B

$$\frac{{{\text{m}}{l^2}}}{6}$$

C

$$\frac{{{\text{m}}{l^2}}}{8}$$

D

$$\frac{{{\text{m}}{l^2}}}{{12}}$$

When a body moves round a fixed axis, it has

A

A rotary motion

B

A circular motion

C

A translatory

D

A rotary motion and translatory motion

If the flow of air through the compressor is perpendicular to its axis, then it is a

A

Reciprocating compressor

B

Centrifugal compressor

C

Axial flow compressor

D

Turbo compressor

The distance between two stations, Dhaka and Chittagong is 450 km. A train starts at 5 pm from Dhaka and moves towards chittagong at an average speed of 60 km/hr. Another train starts from Chittagong at 4:20 pm and moves towards Dhaka at an average speed of 80 km/hr. At what time will the two trains meet?

A

6:10 pm

B

7:05 pm

C

8:15 pm

D

6: 35 pm

When the particles of a body moves perpendicular to its axis, then the body is said to have

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