Machine Design (2171909) MCQs

MCQs of Rolling Contact Bearings

Showing 51 to 60 out of 64 Questions
3 4 5 6 7
51.

For the majority of bearings, actual life is considerably greater than rated life.

(a)

True
(b)

False
Answer:

Option (a)

52.

The dynamic load-carrying capacity of a bearing is defined as the radial load in radial bearings that can be carried for a minimum life of 1000 revolutions.

(a)

True
(b)

False
Answer:

Option (b)

53.

In the expression of dynamic load capacity P=XVFr + YFa, V stands for?

(a)

Race rotation factor
(b)

Radial load factor
(c)

Thrust load factor
(d)

Service factor
Answer:

Option (a)

54.

In the expression of dynamic load capacity P=XVFr + YFa, X stands for?

(a)

Race rotation factor
(b)

Radial load factor
(c)

Thrust load factor
(d)

Service factor
Answer:

Option (b)

55.

In the expression of dynamic load capacity P=XVFr + YFa, Y stands for?

(a)

Race rotation factor
(b)

Radial load factor
(c)

Thrust load factor
(d)

Service factor
Answer:

Option (c)

56.

Calculate the bearing life if expected life for 90% bearings is 9000 hr and the shaft is rotating at 1500 rpm.

(a)

850 million rev
(b)

810 million rev
(c)

810 hr
(d)

850 hr
Answer:

Option (b)

57.

The ball bearing is subjected to a radial load of 4000 N. Expected life for 90% bearings is 9000 hr and the shaft is rotating at 1500 rpm. Calculate the dynamic load capacity.

(a)

42.21 kN
(b)

37.29 kN
(c)

26.33 kN
(d)

35.22 kN
Answer:

Option (b)

58.

Extreme Pressure (EP) additives cause ______ wear in the bearing parts.

(a)

abrasive
(b)

corrosive
(c)

pitting
(d)

fatigue
Answer:

Option (b)

59.

Scoring is a ________ phenomenon.

(a)

stick-slip
(b)

fracture
(c)

fatigue
(d)

in-out
Answer:

Option (a)

60.

_______ is a surface fatigue failure which occurs when the load on the bearing part exceeds the surface endurance strength of the material.

(a)

Scoring
(b)

Pitting
(c)

Corrosion
(d)

Abrasive wear
Answer:

Option (b)

Showing 51 to 60 out of 64 Questions
3 4 5 6 7