Machine Design (2171909) MCQs

MCQs of Journal Bearings

Showing 1 to 10 out of 81 Questions
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1.

A sliding bearing which operates without any lubricant present is called

(a)

zero film bearing
(b)

boundary lubricated bearing
(c)

hydrodynamic lubricated bearing
(d)

hydrostatic lubricated bearing
Answer:

Option (a)

2.

In a journal bearing, the load on the bearing is __________ to the axis of the journal.

(a)

parallel
(b)

perpendicular
Answer:

Option (b)

3.

A sliding bearing in which although lubricant is present, the working surfaces __________ contact each other at least part of the time, is called boundary lubricated bearing.

(a)

partially
(b)

fully
Answer:

Option (a)

4.

The bearing characteristic number in a hydrodynamic bearing depends upon

(a)

length, width, and load
(b)

length, width, and speed
(c)

viscosity, speed, and bearing pressure
(d)

viscosity, speed, and load
Answer:

Option (c)

5.

In an oil-lubricated journal bearing, the coefficient of friction between the journal and the bearing

(a)

remains constant at all speeds
(b)

becomes minimum at optimum speed and then increases with further increase in speed
(c)

is minimum at zero speed and increases monotonically with an increase in speed
(d)

is maximum at zero speed and decreases monotonically with an increase in speed
Answer:

Option (b)

6.

When the length of the journal is equal to the diameter of the journal, then the bearing is said to be a

(a)

short bearing
(b)

long bearing
(c)

square bearing
(d)

medium bearing
Answer:

Option (c)

7.

In thrust bearings, the load acts

(a)

parallel to the axis of rotation
(b)

along the axis of rotation
(c)

perpendicular to the axis of rotation
(d)

in any direction
Answer:

Option (b)

8.

In a full journal bearing, the angle of contact of the bearing with the journal is

(a)

120°
(b)

180°
(c)

270°
(d)

360°
Answer:

Option (d)

9.

A sliding bearing which can support steady loads without any relative motion between the journal and the bearing is called

(a)

zero film bearing
(b)

boundary lubricated bearing
(c)

hydrodynamic lubricated bearing
(d)

hydrostatic lubricated bearing
Answer:

Option (d)

10.

In a hydrodynamic lubricated bearing

(a)

there is a thick film of lubricant between the journal and the bearing
(b)

there is a thin 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
Answer:

Option (a)

Showing 1 to 10 out of 81 Questions
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