Machine Design MCQs

Question 1

According to Indian standards, total numbers of tolerance grades are

Accepted Answer

18

Answer

8

Answer

12

Answer

20

Question 2

The ratio of circumferential stress to longitudinal stress in a thin cylinder subjected to an internal pressure is

Accepted Answer

2

Answer

$$\frac{1}{2}$$

Answer

1

Answer

4

Question 3

The most important dimension in the design of a nut is

Accepted Answer

Height

Answer

Pitch diameter

Answer

Inside diameter

Answer

Outside diameter

Question 4

The value of Lewis form factor used in design of gears is

Accepted Answer

All of these

Answer

Dependent on number of teeth of a gear

Answer

Dependent on system of teeth

Answer

Independent of size of teeth

Question 5

The design of the pressure vessel is based on

Accepted Answer

Hoop stress

Answer

Longitudinal stress

Answer

Longitudinal and hoop stress

Answer

None of these

Question 6

The stress which vary from a minimum value to a maximum value of the same nature (i.e. tensile or compressive) is called

Accepted Answer

Fluctuating stress

Answer

Repeated stress

Answer

Yield stress

Answer

Alternating stress

Question 7

For crank shaft bearings, the ratio of the length of the journal to its diameter is _________.

Accepted Answer

Less than unity

Answer

Greater than unity

Answer

Equal to 1

Answer

None of these

Question 8

If T is the actual number of teeth on a helical gear and $$\varphi $$ is the helix angle for the teeth, then formative number of teeth is written as

Accepted Answer

$${	ext{T}}{\sec ^3}\varphi $$

Answer

$${	ext{T}}{\sec ^2}\varphi $$

Answer

$$\frac{{	ext{T}}}{{{{\sec }^3}\varphi }}$$

Answer

$${	ext{Tcosec}}\varphi $$

Question 9

In a flange coupling, the flanges are coupled together by means of

Accepted Answer

Bolts and nuts

Answer

Studs

Answer

Headless taper bolts

Answer

None of these