THE HIGHER THE BEARING LOAD, THE HIGHER THE VISCOSITY NEEDED TO FLO...

3. the higher the bearing load, the higher the viscosity needed to float the

journal at a given speed.

Of these statements:

(a) 1, 2 and 3 are correct

(b) 1 and 2 are correct

(c) 2 and 3 are correct

(d) 1 and 3 are correct

IAS-9Ans. (a)

IAS-10. Assertion

(A): An important feature of film lubrication is that once a lubricant film

is formed on the mating surfaces by running the bearing with a lubricant having a

high degree of oiliness, it is possible to change to a lubricant with a much lower

oiliness.

[IAS-1999]

Reason (R) Lubricants of high oiliness are liable to decompose or oxidize and hence

are not suitable for general lubrication purposes.

(a) Both A and R are individually true and R is the correct explanation of A

(b) Both A and R are individually true but R is not the correct explanation of A

(c) A is true but R is false

(d) A is false but R is true

IAS-10Ans. (a)

IAS-11. Thrust bearings of the sliding type are often provided with multiple

sector-shaped bearing pads of the tilting type instead of a continuous

angular bearing surface in order to

[IAS 1994]

(a) Distribute the thrust load more non-uniformly

(b) Provide limited adjustments to shaft misalignments

(c) Enable the formation of a wedge shaped oil film

(d) Enable lubricating oil to come into contact with the total bearing area

IAS-11 Ans. (c)

IAS-12. The most suitable bearing for carrying very heavy loads with slow speed is

(a) Hydrodynamic bearing

(b) ball bearing

[IAS 1994]

(c) Roller bearing

(d) hydrostatic bearing

IAS-12 Ans. (d)

IAS-13. Match List -I (Bearings) with List-II (Applications) and select the correct

answer using the codes given below the lists:

[IAS-1998]

List

–I

List-II

A. Journal bearing

1. Electric motors

B. Thrust bearing

2. Watches

C. Conical pivot bearing

3. Marineengines

D. Ball bearing

4. Swivelling chairs

Codes:

A

B

C

D

A

B

C

D

(a)

3

4

1

2

(b)

4

2

1

3

(c)

3

4

2

1

(d)

4

2

3

1

S K Mondal’s

Chapter 4

IAS-13Ans. (c)

Fluctuating Load Consideration for Design

S K Mondal’s

Chapter 5