Machine Design MCQs

Question 1

The ratio of endurance limit in shear to the endurance limit in flexure is

Accepted Answer

0.55

Answer

0.33

Answer

0.4

Answer

0.5

Question 2

The cam follower generally used in automobile engines is

Accepted Answer

Spherical faced follower

Answer

Knife edge follower

Answer

Flat faced follower

Answer

Roller follower

Question 3

The bending moment ‘M’ and a torque ‘T’ is applied on a solid circular shaft. If the maximum bending stress equals to maximum shear stress developed, then ‘M’ is equal to

Accepted Answer

$$\frac{{	ext{T}}}{2}$$

Answer

1T

Answer

2T

Answer

4T

Question 4

In the case of an elastic bar fixed at upper end and loaded by a falling weight at lower end, the shock load produced can be decreased by

Accepted Answer

Decreasing the cross-section area of bar

Answer

Increasing the cross-section area of bar

Answer

Remain unaffected with cross-section area

Answer

Would depend upon other factors

Question 5

A bolt of uniform strength can be developed by

Accepted Answer

Keeping the core diameter of threads equal to the diameter of unthreaded portion of the bolt

Answer

Keeping the core diameter smaller than the diameter of the unthreaded portion

Answer

Keeping the nominal diameter of threads equal to the diameter of unthreaded portion of the bolt

Answer

None of the above

Question 6

The power transmitted by the belt drive can be increased by

Accepted Answer

All of the above methods

Answer

Increasing the initial tension in the belt

Answer

Dressing the belt to increase the coefficient of friction

Answer

Increasing wrap angle by using idler pulley

Question 7

The shock absorbing capacity of a bolt can be increased by

Accepted Answer

Making shank diameter equal to core diameter of thread

Answer

Tightening it properly

Answer

Increasing shank diameter

Answer

Grinding the shank

Question 8

Pick up wrong statement. Fatigue strength can be increased by

Accepted Answer

Hot working

Answer

Cold working

Answer

Shot peening

Answer

Grinding and lapping surface

Question 9

The taper on key is given on

Accepted Answer

Top side only

Answer

Bottom side only

Answer

On both sides

Answer

Any side