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

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

A

Remains constant at all speeds

B

Is minimum at zero speed and increases monotonically with increase in speed

C

Is maximum at zero speed and decreases monotonically with increase in speed

D

Becomes minimum at an optimum speed and then increases with further increase in speed

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

A

Parallel

B

Perpendicular

C

Both A and B

D

None of these

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

A

120°

B

180°

C

270°

D

360°

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

A

120°

B

180°

C

270°

D

360°

If p = bearing pressure on projected bearing area, Z = absolute viscosity of lubricant and N = speed of journal, then the bearing characteristic number is given by

A

$$\frac{{{\text{ZN}}}}{{\text{p}}}$$

B

$$\frac{{\text{p}}}{{{\text{ZN}}}}$$

C

$$\frac{{\text{Z}}}{{{\text{pN}}}}$$

D

$$\frac{{\text{N}}}{{{\text{Zp}}}}$$

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

Medium bearing

D

Square bearing

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

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

C

Either A or B

D

None of these

In a boundary lubricated bearing, there is a __________ of lubricant between the journal and the bearing.

A

Thick film

B

Thin film

C

Either A or B

D

None of these

When a bogie negotiates a curve, reduction in adhesion occurs resulting in sliding. Thus sliding is acute when

A

Wheel base of axles is more

B

Degree of curvature is more

C

Both (A) and (B)

D

None of the above

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

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