Machine Design MCQs

Question 1

Fine pitch involute spur gears are those having diametrical pitch

Accepted Answer

Greater than 20

Answer

Less than 20

Answer

Diametrical pitch is not concerned with fineness of pitch

Answer

Equal to zero

Question 2

The value of form factor used in design of gear is

Accepted Answer

All of the above

Answer

Independent of the size of the tooth

Answer

Depends on the number of teeth on a gear

Answer

Depends on the system of the teeth

Question 3

Larger helix angles in opposite hand helical gears result in

Accepted Answer

Both (a) and (b) above

Answer

Smooth and quiet operation

Answer

Strong teeth

Answer

Noisy operation and weaker teeth

Question 4

Stub teeth are cut on gears in order to

Accepted Answer

Increase capability to withstand shocks and vibrations

Answer

Reduce noise

Answer

Improve transmission efficiency

Answer

Reduce centre distance

Question 5

If the lead angle of a worm is 20°, then helix angle will be

Accepted Answer

70°

Answer

20°

Answer

10°

Answer

80°

Question 6

In zerol bevel gears, the axes

Accepted Answer

Intersect, and the teeth are curved and can be ground

Answer

Are non-parallel and non-intersecting, and the teeth are curved

Answer

Are non-parallel and non-intersecting, and the teeth are straight

Answer

Intersect, and the teeth are curved and oblique

Question 7

Compared to spur gears, helical gears

Accepted Answer

Run more smoothly

Answer

Run with more vibrations and noise

Answer

Run exactly alike

Answer

Consume more power

Question 8

The gear reduction of a worm gear set with worm gear of 50 teeth and worm of double lead thread would be

Accepted Answer

25 : 1

Answer

50 : 1

Answer

100 : 1

Answer

Any one of the above

Question 9

The following material should be used for gears to run quietly at high speed

Accepted Answer

Non-metallic material

Answer

Harder steel

Answer

Softer material

Answer

Non-ferrous material