WEIGHT/UNIT LENGTH OF THE BELT WHICH OF THE ABOVE ARE CORRECT

4. weight/unit length of the belt

Which of the above are correct?

(a) 1, 2, 3 and 4

(b) 1 and 2 only

(c) 1 and 3 only

(d) 3 and 4 only

IES-44Ans. (a)

V-belt

designation

B – 2786 – Gr50 → standard size of belt

↓ ↓

Type

nominal

of inside

v belt length

Design of Friction Drives

S K Mondal’s

Chapter 2

Initial tension in the belt

IES-45. Given that T

1

and T

2

are the tensions on the tight and slack sides of the

belt respectively, the initial tension of the belt taking into account

centrifugal tension T

c

, is equal to

[IES-1997]

(a)

¹

²

T

+ +

T

T

c

(c)

¹

²

3

T

+ +

T

T

c

(d)

¹

²

3

T

− +

T

T

c

T

+ +

T

T

c

(b)

¹

²

2

2

3

IES-45Ans. (b)

Chain drive

IES-46. Which one of the following drives is used for a constant velocity ratio,

positive drive with large centre distance between the driver and driven

shafts?

IES-2004]

(a) Gear drive (b) Flat belt drive

(c) Chain drive

(d) V-belt drive

IES-46Ans. (c)

IES-47. Assertion

(A): Slider-crank chain is an inversion of the four-bar mechanism.

Reason(R): Slider-crank chain often finds applications in most of the reciprocating

machinery.

[IES-2003]

(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-47Ans. (b)

IES-48. Match List I (Applications) with List II (Drive element) and select the

correct answer using the codes given below the Lists:

[IES-2000]

List

I

List

II

A. Automobile differential

1. Flat belt

B.

Bicycle

2.

V-belt

C. Planning machine

3. Chain drive

D. Radiator fan of automobile

4. Gear drive

Code: A B C D A B C D

(a)

4

3

1

2

(b)

1

3

4

2

(c)

4

2

1

3

(d)

1

2

4

3

IES-48Ans. (a)

IES-49. Sources of power loss in a chain drive are given below:

[IES-1995]