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

Consider the following statements pertaining to the open die forging of a cylindrical specimen between two flat dies: 1. Lubricated specimens show more surface movement than unlubricated ones. 2. Lubricated specimens show less surface movement than unlubricated ones. 3. Lubricated specimens show more barrelling than unlubricated ones. 4. Lubricated specimens show less barrelling than unlubricated ones. Which of these statements are correct?

A

1 and 3

B

1 and 4

C

2 and 3

D

2 and 4

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

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

A wave is first reflected by a boundary P and then by a boundary Q without dissipating energy. If the boundary P is rigid and the boundary Q is non-rigid, then find the fraction of the amplitude of the reflected wave by boundary P to the reflected wave by boundary Q.

A

0

B

∞

C

1 : 1

D

None of these

In the following sentence, a part of the sentence is underlined. Below are given alternatives to the underlined part, which may improve the sentence. Choose the correct alternative in case no improvement is needed, choose the alternative that indicates ''No Improvement.'' Here are the journal article for the assignment. A. is the journal article B. is the journal articles C. these are the journal article

A

Only A

B

Only C

C

Only B

D

Both B and C

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

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

S₁:Since the sixties there has been an increasing interest in neurophysiology, which deals with the neural bases of mental activity and behaviour.
P :It has format which is very similar to that of Brain and Language, a sister journal.
Q :Since then, a number of journals devoted entirely to this area of research have appeared.
R :Before the 1960's when this field was the concern of a small number of investigators, research articles were scattered in various neurological journals.
S :Brain and cognition is one such journal.
S₆:So far the journal has published the mixture of articles including reports and investigations.

The Proper sequence should be:

A

RQSP

B

QRSP

C

QSPR

D

RSPQ

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

Statement (I): The journal while rotating inside a bearing automatically shifts its centre to one side and thus the journal is eccentric inside the bearing. Statement (II): The wedge shape of oil film gives rise to thin-film lubrication, which is considered as stable lubrication.

A

Both Statement (I) and Statement (II) are individually true, and Statement (II) is the correct explanation of Statement (I)

B

Both Statement (I) and Statement (II) are individually true, but Statement (II) is NOT the correct explanation of Statement (I)

C

Statement (I) is true, but Statement (II) is false

D

Statement (I) is false, but Statement (II) is true

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

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