Machine Design MCQs

Question 1

The ratio of belt tensions $$\frac{{{{	ext{p}}_1}}}{{{{	ext{p}}_2}}}$$ considering centrifugal force in flat belt is given by where, m = mass of belt per meter (kg/m) v = belt velocity (m/s) f = coefficient of friction $$\alpha $$ = angle of wrap (radians)

Accepted Answer

$$\frac{{{{	ext{p}}_1} - {	ext{m}}{{	ext{v}}^2}}}{{{{	ext{p}}_2} - {	ext{m}}{{	ext{v}}^2}}} = {{	ext{e}}^{{	ext{f}}\alpha }}$$

Answer

$$\frac{{{{	ext{p}}_1}}}{{{{	ext{p}}_2}}} = {{	ext{e}}^{{	ext{f}}\alpha }}$$

Answer

$$\frac{{{{	ext{p}}_1}}}{{{{	ext{p}}_2}}} = {{	ext{e}}^{ - {	ext{f}}\alpha }}$$

Answer

$$\frac{{{{	ext{p}}_1} - {	ext{m}}{{	ext{v}}^2}}}{{{{	ext{p}}_2} - {	ext{m}}{{	ext{v}}^2}}} = {{	ext{e}}^{ - {	ext{f}}\alpha }}$$

Question 2

The cam follower extensively used in aircraft engines is

Accepted Answer

Roller follower

Answer

Knife edge follower

Answer

Flat faced follower

Answer

Spherical faced follower

Question 3

The endurance limit in shear of carbon steel can be obtained by multiplying the endurance limit in flexure by a factor of

Accepted Answer

0.75

Answer

0.45

Answer

0.55

Answer

0.65

Question 4

Multiple threads are used to secure

Accepted Answer

High efficiency

Answer

Low efficiency

Answer

High load lifting capacity

Answer

High mechanical advantage

Question 5

Whether any core is required in wire ropes

Accepted Answer

Yes

Answer

No

Answer

Sometimes

Answer

Rarely

Question 6

The stress in the threaded part of the bolt will be __________ as compared to the shank.

Accepted Answer

Higher

Answer

Same

Answer

Lower

Answer

None of these

Question 7

In cross or regular lay ropes

Accepted Answer

Direction of twist of wires in strands is opposite to the direction of twist of strands

Answer

Direction of twist of wires and strands are same

Answer

Wires in two adjacent strands are twisted in opposite direction

Answer

Wires are not twisted

Question 8

The lower deviation is the algebraic difference between the

Accepted Answer

Minimum limit and the basic size

Answer

Actual size and the corresponding basic size

Answer

Maximum limit and the basic size

Answer

None of the above

Question 9

An Involute pinion and gear are in mesh. If both have the same size of addendum, then there will be interference between the

Accepted Answer

Tip of the gear and flank of pinion

Answer

Tip of the pinion and flank of gear

Answer

Flanks of both gear and pinion

Answer

Tip of both gear and pinion