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 beltIES-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 driveIES-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]