Machine Design MCQs

Question 1

The relation between the pitch of the chain (p) and pitch circle diameter of the sprocket (D) is given by (where T = Number of teeth on the sprocket)

Accepted Answer

$${	ext{p}} = {	ext{D}}\sin \frac{{{{180}^ \circ }}}{{	ext{T}}}$$

Answer

$${	ext{p}} = {	ext{D}}\sin \frac{{{{90}^ \circ }}}{{	ext{T}}}$$

Answer

$${	ext{p}} = {	ext{D}}\sin \frac{{{{120}^ \circ }}}{{	ext{T}}}$$

Answer

$${	ext{p}} = {	ext{D}}\sin \frac{{{{360}^ \circ }}}{{	ext{T}}}$$

Question 2

In standard taper roller bearings, the angle of taper of outer raceway is

Accepted Answer

25°

Answer

5°

Answer

8°

Answer

15°

Question 3

In case of pressure vessels having open ends, the fluid pressure induces

Accepted Answer

Circumferential stress

Answer

Longitudinal stress

Answer

Shear stress

Answer

None of these

Question 4

In case of pressure vessels having closed ends, the fluid pressure induces

Accepted Answer

Longitudinal stress

Answer

Shear stress

Answer

Circumferential stress

Answer

None of these

Question 5

A saddle key __________ power through frictional resistance only.

Accepted Answer

Transmits

Answer

Does not transmit

Answer

Either A or B

Answer

None of these

Question 6

The endurance limit of a material with finished surface in comparison to rough surface is

Accepted Answer

More

Answer

Less

Answer

Same

Answer

More or less depending on quantum of load

Question 7

A locking device in which the bottom cylindrical portion is recessed to receive the tip of the locking set screw, is called

Accepted Answer

Ring nut

Answer

Castle nut

Answer

Sawn nut

Answer

Jam nut

Question 8

A screw will be self locking, if

Accepted Answer

Friction angle is more than helix angle

Answer

Friction angle is less than helix angle

Answer

Friction angle is equal to helix angle

Answer

Efficiency of screw is 100%

Question 9

For high speed engines, the cam follower should move with

Accepted Answer

Cycloidal motion

Answer

Uniform velocity

Answer

Simple harmonic motion

Answer

Uniform acceleration and retardation