Machine Design MCQs

Question 1

The material commonly used for machine tool bodies is

Accepted Answer

Cast iron

Answer

Mild steel

Answer

Aluminium

Answer

Brass

Question 2

When the belt is transmitting maximum power,

Accepted Answer

The tension in tight side is twice the centrifugal tension

Answer

The tension in slack side is equal to the centrifugal tension

Answer

The tension in tight side is thrice the centrifugal tension

Answer

None of the above

Question 3

When a belt drive is transmitting maximum power,

Accepted Answer

Driving tension on tight side is twice the centrifugal tension

Answer

Effective tension is equal to centrifugal tension

Answer

Effective tension is half of centrifugal tension

Answer

Driving tension on slack side is equal to centrifugal tension

Question 4

When a helical compression spring is cut into halves, the stiffness of the resulting spring will be

Accepted Answer

Double

Answer

Same

Answer

One-half

Answer

One-fourth

Question 5

The design of pin of a rocker arm of an I.C. engine is based on

Accepted Answer

All of these

Answer

Bearing failure

Answer

Shearing failure

Answer

Bending failure

Question 6

The efficiency of a square threaded screw is maximum if the helix angle is equal to(Where $$\varphi $$ = Angle of friction)

Accepted Answer

$${45^ \circ } - \frac{\varphi }{2}$$

Answer

$${90^ \circ } - \varphi $$

Answer

$${45^ \circ } - \varphi $$

Answer

$${45^ \circ } + \frac{\varphi }{2}$$

Question 7

Brittle coating technique is used for

Accepted Answer

Experimental stress analysis

Answer

Determining brittleness

Answer

Protecting metal against corrosion

Answer

Protecting metal against wear and tear

Question 8

If a shaft made from ductile material is subjected to combined bending and twisting moment, calculations based on which one of the following failure theories will give the most conservative value?

Accepted Answer

Maximum distortion energy theory

Answer

Maximum principal stress theory

Answer

Maximum shear stress theory

Answer

Maximum strain energy theory

Question 9

The process which improves the machinability of steels, but lowers the hardness and tensile strength is

Accepted Answer

Spheroidising

Answer

Normalising

Answer

Full annealing

Answer

Process annealing