Machine Design MCQs

Question 1

If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by

Accepted Answer

$$\frac{{{	ext{ZN}}}}{{	ext{p}}}$$

Answer

$$\frac{{	ext{p}}}{{{	ext{ZN}}}}$$

Answer

$$\frac{{	ext{Z}}}{{{	ext{pN}}}}$$

Answer

$$\frac{{	ext{N}}}{{{	ext{Zp}}}}$$

Question 2

The suitable material for belt in agricultural machinery is

Accepted Answer

Rubber

Answer

Leather

Answer

Cotton duck

Answer

Balata gum

Question 3

Which process will increase the fatigue duration of parts?

Accepted Answer

Shot-peening

Answer

Finishing and polishing

Answer

De-carburisation

Answer

Electroplating

Question 4

Coaxing is the procedure of increasing

Accepted Answer

Fatigue limit by over-stressing the metal by successively increasing loadings

Answer

Metal strength by cycling

Answer

Metal hardness by surface treatment

Answer

Metal resistance to corrosion by coating

Question 5

In a flange coupling, the keys are staggered at __________ along the circumference of the shafts in order to divide the weakening effect caused by key ways.

Accepted Answer

90°

Answer

135°

Answer

160°

Answer

180°

Question 6

The minimum number of teeth on the pinion which will mesh with any gear without interference for 20° full depth involute teeth will be

Accepted Answer

18

Answer

12

Answer

14

Answer

24

Question 7

A tube has the following advantage over pipe

Accepted Answer

All of the above

Answer

Lighter and easier to handle

Answer

Greater shock absorption

Answer

Smoother inside walls

Question 8

The included angle for the V-belt is usually

Accepted Answer

30° - 40°

Answer

10° - 20°

Answer

40° - 60°

Answer

60° - 80°

Question 9

The rivet head used for boiler plate riveting is usually

Accepted Answer

Snap head

Answer

Pan Head

Answer

Counter sunk head

Answer

Conical head