Machine Design MCQs

Question 1

Multiple threaded screws

Accepted Answer

Increase the efficiency

Answer

Increase the mechanical advantage

Answer

Increase the self locking feature

Answer

Decrease the efficiency

Question 2

Use of large thread angles in lifting machine would result in

Accepted Answer

Lower mechanical advantage

Answer

Higher mechanical advantage

Answer

No change in mechanical advantage

Answer

Lifting the load easily

Question 3

Bolts are designed on the basis of

Accepted Answer

Direct tensile stress with high safety factor

Answer

Direct shear stress with high safety factor

Answer

Direct compressive stress with high safety factor

Answer

Direct bearing stress with high safety factor

Question 4

Universal coupling is used to join two shafts which

Accepted Answer

Whose axes intersect at a small angle

Answer

Have lateral misalignment

Answer

Are not in exact alignment

Answer

Is the simplest type of rigid coupling

Question 5

Metal to metal joint is used for applications subjected to

Accepted Answer

Very high pressure

Answer

Very high temperature

Answer

Very high pressures arid temperatures

Answer

Severe vibrations

Question 6

A screw is specified by

Accepted Answer

Nominal major diameter

Answer

Major diameter x pitch

Answer

Minimum diameter x length

Answer

Major diameter x length

Question 7

Screws used for power transmission should have

Accepted Answer

High efficiency

Answer

Strong teeth

Answer

Finished threads

Answer

High efficiency and strong teeth

Question 8

The maximum efficiency of a screw jack having square threads and friction angle of 3O° will be

Accepted Answer

33%

Answer

11%

Answer

20%

Answer

30%

Question 9

The important criterion in case of riveted joints for material storage and other ordinary tanks is

Accepted Answer

Strength and rigidly

Answer

Efficiency of joint

Answer

Economy of design

Answer

Leakage