Machine Design MCQs

Question 1

A type of brake commonly used in motor cars is a

Accepted Answer

Internal expanding brake

Answer

Shoe brake

Answer

Band and block brake

Answer

Band brake

Question 2

When a load W is applied suddenly on a bar of cross-sectional area A, the stress induced in the bar will be

Accepted Answer

$$\frac{{2{	ext{W}}}}{{	ext{A}}}$$

Answer

$$\frac{{	ext{W}}}{{	ext{A}}}$$

Answer

$$\frac{{	ext{W}}}{{2{	ext{A}}}}$$

Answer

$$\frac{{3{	ext{W}}}}{{	ext{A}}}$$

Question 3

In helical gears, the right hand helixes on one gear will mesh __________ helixes on the other gear.

Accepted Answer

Left hand

Answer

Right hand

Answer

Both A and B

Answer

None of these

Question 4

The pitch diameter is the __________ diameter of an external or internal screw thread.

Accepted Answer

Effective

Answer

Smallest

Answer

Largest

Answer

None of these

Question 5

In unilateral system of tolerance, the tolerance is allowed on

Accepted Answer

One side of the nominal size

Answer

Both sides of the actual size

Answer

One side of the actual size

Answer

Both sides of the nominal size

Question 6

A hollow shaft will transmit a __________ torque than a solid shaft of the same mass and same material.

Accepted Answer

Greater

Answer

Smaller

Answer

Medium

Answer

None of these

Question 7

In worm gears, the angle between the tangent to the pitch helix and an element of the cylinder, is known as

Accepted Answer

Helix angle

Answer

Pressure angle

Answer

Pitch lead angle

Answer

None of these

Question 8

A column is known as a long column if the slenderness ratio is

Accepted Answer

100

Answer

40

Answer

50

Answer

70

Question 9

Euler’s formula for a mild steel column is not valid if the slenderness ratio is

Accepted Answer

60

Answer

90

Answer

120

Answer

100