Machine Design MCQs

Question 1

The following type of nut is used with allen bolt

Accepted Answer

Any one of the above

Answer

Allen nut

Answer

Slotted nut

Answer

Castle nut

Question 2

The included angle in unified of American National threads is

Accepted Answer

60°

Answer

55°

Answer

47.5°

Answer

29°

Question 3

The included angle in Acme threads is

Accepted Answer

29°

Answer

60°

Answer

35°

Answer

47.5°

Question 4

An allen bolt is

Accepted Answer

Provided with hexagonal depression in head

Answer

Self locking bolt

Answer

Same as stud

Answer

Used in high speed components

Question 5

The deflection of a cantilever beam under load W is δ. If its width is halved, then the deflection under load W will be

Accepted Answer

4δ

Answer

2δ

Answer

δ/2

Answer

δ/4

Question 6

A self locking screw has

Accepted Answer

Coefficient of friction ≥ tangent of load angle

Answer

Fine threads

Answer

Coarse threads

Answer

Hole for inserting split pin

Question 7

The designation M 33 x 2 of a bolt means

Accepted Answer

Metric threads of 33 mm outside diameter and 2 mm pitch

Answer

Metric threads of 33 nos in 2 cm

Answer

Metric threads with cross-section of 33 mm^2

Answer

Bolt of 33 mm nominal diameter having 2 threads per cm

Question 8

The edges of a boiler plate are bevelled to an angle of

Accepted Answer

80°

Answer

30°

Answer

4°

Answer

60°

Question 9

In order to avoid tearing of the plate at edge, the distance from the centre line of the rivet hole to the nearest edge of the plate in terms of dia of rivet d should be equal to

Accepted Answer

1.5 d

Answer

d

Answer

1.25 d

Answer

1.75 d