Question Set 178

21.

The velocity of sliding __________ the distance of the point of contact from the pitch point.

A.	is directly proportional to
B.	is inversely proportional to
C.	is equal to cos φ multiplied by
D.	does not depend upon

Answer: Option A

22.

A column is known as a long column if the slenderness ratio is

A.	40
B.	50
C.	70
D.	100

Answer: Option D

23.

Circumferential joint in boilers is used to get the required length of a boiler.

A.	True
B.	False

Answer: Option A

24.

The ball bearings are provided with a cage

A.	to reduce friction
B.	to facilitate slipping of balls
C.	to prevent the lubricant from flowing out
D.	to maintain the balls at a fixed distance apart

Answer: Option D

25.

When screw threads are to be used in a situation where power is being transmitted in one direction only, then the screw threads suitable for this will be

A.	square threads
B.	acme threads
C.	knuckle threads
D.	buttress threads

Answer: Option D

26.

In radial cams, the follower moves

A.	in a direction perpendicular to the cam axis
B.	in a direction parallel to the cam axis
C.	in any direction irrespective of cam axis
D.	along the cam axis

Answer: Option A

27.

The square threads are not so strong as V-threads but they offer less frictional resistance to motion than Whitworth threads.

A.	Correct
B.	Incorrect

Answer: Option A

28.

According to Unwin's formula, the relation between the diameter of rivet hole (d) and the thickness of plate (t) is given by (where d and t are in mm)

A.	d = t
B.	d = 1.6 t
C.	d = 2 t
D.	d = 6 t

Answer: Option D

29.

In order to avoid tearing of the plate at an edge, the distance from the centre line of the rivet hole to the nearest edge of the plate should be equal to (where d = Diameter of rivet hole)

A.	d
B.	1.5 d
C.	2 d
D.	2.5 d

Answer: Option B

30.

The value of stress concentration factor depends upon

A.	material of the part
B.	geometry of the part
C.	material and geometry of the part
D.	none of these

Answer: Option C