Machine Design MCQs

Question 1

According to Indian standard specifications, 100 H6/g5 means that

Accepted Answer

Tolerance grade for the hole is 6 and for the shaft is 5

Answer

Tolerance grade for the shaft is 6 and for the hole is 5

Answer

Tolerance grade for the shaft is 4 to 8 and for the hole is 3 to 7

Answer

Tolerance grade for the hole is 4 to 8 and for the shaft is 3 to 7

Question 2

The usual proportion for the width of key is (where d = Diameter of shaft or diameter of hole in the hub)

Accepted Answer

$$\frac{{	ext{d}}}{4}$$

Answer

$$\frac{{	ext{d}}}{8}$$

Answer

$$\frac{{	ext{d}}}{6}$$

Answer

$$\frac{{	ext{d}}}{2}$$

Question 3

The suitable material for belt used in flour mill is

Accepted Answer

Canvas or cotton duck

Answer

Leather

Answer

Rubber

Answer

Balata gum

Question 4

When a machine member is subjected to torsion, the torsional shear stress set up in the member is

Accepted Answer

Zero at the centroidal axis and maximum at the outer surface of the member

Answer

Zero at both the centroidal axis and outer surface of the member

Answer

Maximum at both the centroidal axis and outer surface of the member

Answer

Maximum at the centroidal axis and zero at the outer surface of the member

Question 5

In Vickers hardness testing, the pyramid indentor apex is

Accepted Answer

136°

Answer

40°

Answer

122°

Answer

152°

Question 6

Wahl's stress factor __________ very rapidly as the spring index decreases.

Accepted Answer

Increases

Answer

Decreases

Answer

Remain same

Answer

None of these

Question 7

In the levers of first type, the mechanical advantage is ________ one.

Accepted Answer

More than

Answer

Less than

Answer

Equal to

Answer

None of these

Question 8

For standard coarse threads of nut, the threads will be as strong in failure by shear as the bolt in tension, if the height of nut (h) is approximately

Accepted Answer

0.4 times

Answer

0.6 times

Answer

0.7 times

Answer

0.8 times

Question 9

Stress concentration is caused due to

Accepted Answer

All of the above

Answer

Variation in properties of material from point to point in a member

Answer

Pitting at points or areas at which loads on a member are applied

Answer

Abrupt change of section