Machine Design MCQs

Question 1

Maximum principal stress theory is applicable for

Accepted Answer

Brittle materials

Answer

Ductile materials

Answer

Elastic materials

Answer

All of the above

Question 2

In the levers of __________ type, the mechanical advantage is less than one.

Accepted Answer

Third

Answer

First

Answer

Second

Answer

None of these

Question 3

The surface finish factor for a mirror polished material is

Accepted Answer

1

Answer

0.45

Answer

0.65

Answer

0.85

Question 4

The circumferential and longitudinal strains in a cylindrical boiler under internal steam pressure are $${\varepsilon _{	ext{c}}}$$ and $${\varepsilon _l}$$ respectively. The change in volume of the boiler cylinder per unit volume will be

Accepted Answer

$$2{\varepsilon _{	ext{c}}} + {\varepsilon _l}$$

Answer

$${\varepsilon _{	ext{c}}} + 2{\varepsilon _l}$$

Answer

$${\varepsilon _{	ext{c}}} + \varepsilon _l^2$$

Answer

$$\varepsilon _{	ext{c}}^2 + {\varepsilon _l}$$

Question 5

A screw is said to be over hauling screw, if its efficiency is

Accepted Answer

More than 50%

Answer

Less than 50%

Answer

Equal to 50%

Answer

None of these

Question 6

A screw is said to be a self locking screw, if its efficiency is

Accepted Answer

Less than 50%

Answer

More than 50%

Answer

Equal to 50%

Answer

None of these

Question 7

The included angle for the British standard whitworth thread is

Accepted Answer

55°

Answer

29°

Answer

47.5°

Answer

60°

Question 8

In V-belt drive, belt touches

Accepted Answer

At sides only

Answer

At bottom

Answer

Both at bottom and sides

Answer

Could touch anywhere

Question 9

The efficiency of a riveted joint is equal to

Accepted Answer

Least of $${{	ext{P}}_{	ext{t}}},\,{{	ext{P}}_{	ext{s}}}$$ and $$\frac{{{{	ext{P}}_{	ext{c}}}}}{{	ext{P}}}$$

Answer

$$\frac{{{{	ext{P}}_{	ext{t}}}}}{{	ext{P}}}$$

Answer

$$\frac{{{{	ext{P}}_{	ext{s}}}}}{{	ext{P}}}$$

Answer

$$\frac{{{{	ext{P}}_{	ext{c}}}}}{{	ext{P}}}$$