Machine Design (2171909) MCQs

MCQs of Journal Bearings

Showing 41 to 50 out of 81 Questions
2 3 4 5 6 7
41.

The fitted bearing must be partial bearing.

(a)

True
(b)

No
(c)

No lubricating space is required
(d)

Can’t be stated
Answer:

Option (a)

42.

The fitted bearing must be partial bearing.

(a)

True
(b)

No
(c)

No lubricating space is required
(d)

Can’t be stated
Answer:

Option (a)

43.

Hydrostatic and hydrodynamic lubrication are the same thing.

(a)

True
(b)

False
Answer:

Option (b)

44.

In hydrostatic bearings

(a)

the oil film pressure is generated only by the rotation of the journal
(b)

the oil film is maintained by supplying oil under pressure
(c)

do not require an external supply of lubricant
(d)

grease is used for lubrication
Answer:

Option (b)

45.

When the lubricant is forced between the journal and the bearing by external pressure, the bearing is called hydrostatic lubricated bearing.

(a)

Agree
(b)

Disagree
Answer:

Option (a)

46.

If we exclude the cost factor, which bearing is preferred?

(a)

Hydrostatic
(b)

Hydrodynamic
(c)

Both are equally preferred
(d)

Cannot be determined
Answer:

Option (a)

47.

If fluid film pressure is high and surface rigidity is low than the mode of lubrication is called elastohydrodynamic lubrication.

(a)

True
(b)

False
Answer:

Option (a)

48.

Hydrostatic bearing usually uses ____ as a lubricant.

(a)

graphite
(b)

grease
(c)

oil
(d)

nothing
Answer:

Option (c)

49.

When the ratio of length to the diameter of the journal is less than 1, then the bearing is said to be a

(a)

short bearing
(b)

long bearing
(c)

medium bearing
(d)

square bearing
Answer:

Option (a)

50.

When the ratio of length to the diameter of the journal is greater than 1, then the bearing is said to be a

(a)

short bearing
(b)

long bearing
(c)

medium bearing
(d)

square bearing
Answer:

Option (b)

Showing 41 to 50 out of 81 Questions
2 3 4 5 6 7