THEY CAN ACCOMMODATE SOME AMOUNT OF MISALIGNMENTS OF SHAFT. OF THES...

5. - GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF 5. - GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF
GATE PAPERS MACHINE DESIGN IES GATE IAS 20 YEARS QUESTION AND ANSWERS PDF

5. They can accommodate some amount of misalignments of shaft.

Of these statements

(a) 1, 2, 3 and 4 are correct

(b) 1,3 and 4 are correct

(c) 1, 4 and 5 are correct

(d) 1, 2, 3 and 5 are correct.

IES-15Ans. (a) Self aligning bearing can accommodate some amount of misalignments of

shaft.

IES-16. Removal of metal particles from the raceway of a rolling contact bearing is

a kind of failure of bearing known as

[IES-1995]

(a) Pitting

(b) wearing

(c) spalling

(d) scuffing

IES-16Ans. (a)

Load-life Relationship

IES-17. The rated life of a ball bearing varies inversely as which one of the

following?

[GATE-1993; IES-2004]

(a) Load

(b) (load)

2

(c) (load)

3

(d)

(load)

3.33

d

P

= ⎜ ⎟

⎛ ⎞

⎝ ⎠

d = dynamic load capacity

IES-17 Ans. (c)

L

,

R

R = Equivalent bearing load

p = 3 for ball bearing

=

10

3

for roller bearing.

IES-18. If the load on a ball bearing is halved, its life:

[IES-2005]

(a) Remains unchanged

(b) Increases two times

(c) Increases four times

(d) Increases eight times

d

3

= ⎜ ⎟

⎛ ⎞

⎝ ⎠

d is dynamic load carrying capacity. R is actual load applied if R

IES-18Ans. (d)

L

R

halved L will increased by 2

3

= 8 times

Design of Bearings

S K Mondal’s

Chapter 4

Selection of Taper Roller Bearings

IES-19. Assertion

(A):

Tapered roller bearings are sensitive to the tightening between

inner and outer races.

[IES-2002]

Reason (R): Tapered roller bearings are always provided with adjusting nut for

tightening.

(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

IES-19Ans. (b)

IES-20. Which bearing is preferred for oscillating conditions?

[IES-1992]

(a) Double row roller bearing

(b) Angular contact single row ball bearing

(c) Taper roller bearing

(d) Needle roller bearing

IES-20Ans. (d)

IES-21. Match List-I (Bearings) with List-II (Applications) and select the correct

answer using the codes given below the lists:

[IES-2001]

List I

List II

A. Cylindrical roller

1. Radial loads

B. Ball-bearing

2. Machine needs frequent dismantling

and assembling

C. Taper rolling bearing

3. Radial loads with lesser thrust

D. Angular contact ball-bearing 4. Shock loads