Machine Design MCQs

Question 1

Stress concentration in static loading is more serious in

Accepted Answer

Brittle materials

Answer

Ductile materials

Answer

Equally serious in both cases

Answer

Depends on other factors

Question 2

In static loading, stress concentration is more serious in

Accepted Answer

Brittle materials

Answer

Ductile materials

Answer

Brittle as well as ductile materials

Answer

Elastic materials

Question 3

In cyclic loading, stress concentration is more serious in

Accepted Answer

Ductile materials

Answer

Brittle materials

Answer

Brittle as well as ductile materials

Answer

Elastic materials

Question 4

In a journal bearing, the load on the bearing is __________ to the axis of the journal.

Accepted Answer

Perpendicular

Answer

Parallel

Answer

Both A and B

Answer

None of these

Question 5

Which is positive drive?

Accepted Answer

Timing belt

Answer

Flat belt drive

Answer

V belt drive

Answer

Crossed belt drive

Question 6

The shear modulus of resilience is proportional to

Accepted Answer

(Shear stress)2

Answer

Shear stress

Answer

(Shear stress)3

Answer

(Shear stress)4

Question 7

For a shoe brake, the equivalent coefficient of friction is equal to (where $$\mu $$ = Actual coefficient of friction and $$	heta $$ = Semi-block angle)

Accepted Answer

$$\frac{{4\mu \sin 	heta }}{{2	heta + \sin 2	heta }}$$

Answer

$$\frac{{2\mu \sin 	heta }}{{	heta + \sin 	heta }}$$

Answer

$$\frac{{\mu \sin 	heta }}{{2	heta + \sin 2	heta }}$$

Answer

$$\frac{{4\mu \sin 	heta }}{{	heta + \sin 	heta }}$$

Question 8

Set screws are

Accepted Answer

Used to prevent relative motion between parts

Answer

Similar to small size tap bolts except that a greater variety of shapes of heads are available

Answer

Slotted for a screw driver and generally used with a nut

Answer

Similar to stud

Question 9

A key capable of tilting in a recess milled out in a shaft is known as

Accepted Answer

Woodruff key

Answer

Feather key

Answer

Flat saddle key

Answer

Hollow saddle key