Machine Design MCQs

Question 1

The longitudinal stress is __________ of the circumferential stress.

Accepted Answer

One-half

Answer

Two-third

Answer

Three-fourth

Answer

Double

Question 2

The constant factor in case of R10 series of preferred numbers is

Accepted Answer

1.26

Answer

1.06

Answer

1.12

Answer

1.58

Question 3

The distribution of the forces along the length of key fitted in a shaft

Accepted Answer

Varies exponentially, being more near the torque-input end

Answer

Varies linearly

Answer

Is uniform throughout

Answer

Varies exponentially, being less near the torque-input end

Question 4

The ratio of driving tensions in V-belt drives is __________ flat belt drives.

Accepted Answer

cosec$$\,\alpha $$ times more than

Answer

Equal to

Answer

sin$$\,\alpha $$ times more than

Answer

sin$$\,\alpha $$ times less than

Question 5

Which of the following is an anti-friction bearing?

Accepted Answer

Needle bearing

Answer

Journal bearing

Answer

Pedestal bearing

Answer

Collar bearing

Question 6

The anti-friction bearings

Accepted Answer

All of these

Answer

Have low starting and low running friction at moderate speeds

Answer

Have high initial cost

Answer

Can carry both radial and thrust loads

Question 7

Elastic nut is a locking device in which

Accepted Answer

Hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is stewed on the bolt causing a tight grip

Answer

One small nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Answer

A slot is cut partly in middle of nut and then slot reduced by tightening a screw

Answer

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at other end

Question 8

Jam nut is a locking device in which

Accepted Answer

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Answer

A slot is cut partly in middle of nut and then slot reduced by tightening a screw

Answer

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

Answer

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter spitted and bent in reverse direction at other end

Question 9

Split nut is a locking device in which

Accepted Answer

A slot is cut partly in middle of nut and then slot reduced by tightening screw

Answer

One smaller nut is tightened over main nut and main nut tightened against smaller one by loosening, creating friction jamming

Answer

A hard fibre or nylon cotter is recessed in the nut and becomes threaded as the nut is screwed on the bolt causing a tight grip

Answer

Through slots are made at top and a cotter pin is passed through these and a hole in the bolt, and cotter pin splitted and bent in reverse direction at the other end