Machine Design (2171909) MCQs

MCQs of Journal Bearings

Showing 51 to 60 out of 81 Questions
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51.

In hydrodynamic lubrication, film thickness remains unaffected by the change in speeds?

(a)

True
(b)

Increase with an increase in speed
(c)

Decrease with an increase in speed
(d)

Disappear as the speed tends to infinty
Answer:

Option (b)

52.

Viscosity is defined as the _________ by a fluid to change its shape or relative motion of its parts.

(a)

external frictional resistance offered
(b)

internal frictional resistance offered
(c)

It is not offered but exerted on the fluids
(d)

none of the listed
Answer:

Option (b)

53.

Newton law of viscosity states that shear stress is proportional to the rate of shear at any point in the fluid.

(a)

True
(b)

False
Answer:

Option (a)

54.

Viscosity of lubricating oil ________with increasing temperature.

(a)

decrease
(b)

increases linearly
(c)

increases hyperbolically
(d)

remains constant
Answer:

Option (a)

55.

The rate of change of viscosity with respect to temperature is indicated by a number called

(a)

flash point
(b)

viscosity rate
(c)

oiliness
(d)

viscosity index
Answer:

Option (d)

56.

The lowest temperature at which the oil can flow is called

(a)

fire point
(b)

flash point
(c)

pour point
(d)

oxidation stability
Answer:

Option (c)

57.

Which of the following is not a property of lubricants?

(a)

Fire point
(b)

Flash point
(c)

Pour point
(d)

Oxidation stability
Answer:

Option (d)

58.

__________is difference between the diameters of the bearing and journal.

(a)

Radial clearance
(b)

Diametral clearance
(c)

Eccentricity
(d)

Attitude
Answer:

Option (b)

59.

Diametral clearance ratio is the ratio of the _______.

(a)

diametral clearance to the diameter of the journal
(b)

radial clearance to the diameter of the journal
(c)

diametral clearance to the diameter of the bearing
(d)

radial clearance to the diameter of the bearing
Answer:

Option (a)

60.

Attitude or eccentricity ratio is the ratio of the ________.

(a)

the eccentricity to the diameter of the journal
(b)

the eccentricity to the radius of journal
(c)

the eccentricity to the diametral clearance
(d)

the eccentricity to the radial clearance
Answer:

Option (d)

Showing 51 to 60 out of 81 Questions
3 4 5 6 7 8