MCQs of Journal Bearings (Machine Design - 2171909)

Showing 31 to 40 out of 81 Questions

31.

Which type of lubricant is used in a bearing?

32.

What is the objective of lubrication?

(a)	To reduce friction
(b)	To reduce or prevent wear
(c)	To carry away heat generated due to friction
(d)	All of the mentioned

33.

Thick film lubrication describes a phenomenon where two surfaces are _______ separated.

34.

In a hydrodynamic lubricated bearing

(a)	there is a thin film of lubricant between the journal and the bearing
(b)	there is a thick film of lubricant between the journal and the bearing
(c)	there is no lubricant between the journal and the bearing
(d)	the lubricant is forced between the journal and the bearing, by external pressure

35.

In hydrodynamic bearings

(a)	require an external supply of lubricant
(b)	the oil film is maintained by supplying oil under pressure
(c)	the oil film pressure is generated only by the rotation of the journal
(d)	grease is used for lubrication

36.

Hydrodynamic bearing is a self-acting bearing.

(a)	True
(b)	False

37.

A journal bearing is a ______ contact bearing working on the hydrodynamic lubrication and which supports load in____ direction.

38.

In partial journal bearing friction losses is ________ over full journal bearing.

39.

Temperature rise in the partial bearing is ____ than the full bearing.

40.

A clearance bearing is designed accurately to keep the radius of the journal and bearing equal.

(a)	The Journal radius is kept larger
(b)	The Journal radius is kept smaller
(c)	True
(d)	Can’t be determined

Showing 31 to 40 out of 81 Questions