Machine Design MCQs

Question 1

A steel containing _________ 0.8% carbon is known as hypo-eutectoid steel.

Accepted Answer

Less than

Answer

Equal to

Answer

Greater than

Answer

None of these

Question 2

The application of third type levers is found in

Accepted Answer

A pair of tongs

Answer

Hand wheel of a punching press

Answer

Lever of a loaded safety valve

Answer

Handle of a hand pump

Question 3

The application of second type levers is found in

Accepted Answer

Lever of a loaded safety valve

Answer

Handle of a hand pump

Answer

Hand wheel of a punching press

Answer

A pair of tongs

Question 4

In composite or reverse laid ropes

Accepted Answer

Wires in two adjacent strands are twisted in opposite direction

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 are not twisted

Question 5

In the assembly of pulley, key and shaft

Accepted Answer

Key is made the weakest

Answer

Pulley is made the weakest

Answer

Key is made the strongest

Answer

All the three are designed for equal strength

Question 6

The groove angle of pulleys for V-belt is

Accepted Answer

34° to 36°

Answer

42° to 45°

Answer

More than 45°

Answer

30° to 32°

Question 7

When the speed of belt increases,

Accepted Answer

The power transmitted will increase

Answer

The coefficient of friction between the belt and pulley decreases

Answer

The coefficient of friction between the belt and pulley increases

Answer

The power transmitted will decrease

Question 8

For unequal width of butt straps, the thicknesses of butt straps are

Accepted Answer

0.75 t for wide strap on the inside and 0.625 t for narrow strap on the outside

Answer

0.75 t for narrow strap on the inside and 0.625 t for wide strap on the outside

Answer

0.75 t for both the straps on the inside and outside

Answer

0.625 t for both the straps on the inside and outside

Question 9

A bolt is designed on the basis of __________ with a large factor of safety.

Accepted Answer

Direct tensile stress

Answer

Direct compressive stress

Answer

Direct bending stress

Answer

Direct shear stress