Kinematics and Theory of Machines (3131906) MCQs

MCQs of Friction, Clutch and Brake

Showing 11 to 20 out of 77 Questions
1 2 3 4 5 6
11.

The type of brakes commonly used in railway trains is _____.

(a)

shoe brake
(b)

band brake
(c)

band and block brake
(d)

internal expanding brake
Answer:

Option (a)

12.

The type of brakes commonly used in motor cars is ______.

(a)

shoe brake
(b)

band brake
(c)

band and block brake
(d)

internal expanding brake
Answer:

Option (d)

13.

The efficiency of a screw jack depends on ________.

(a)

the pitch of the threads
(b)

the load
(c)

both pitch and load
(d)

neither pitch nor load
Answer:

Option (a)

14.

The efficiency of a screw jack increases with a/an ______.

(a)

decrease in the load
(b)

increase in the load
(c)

decrease in the pitch
(d)

increase in the pitch
Answer:

Option (d)

15.

For flat and conical pivots, the ratio of the friction torque with uniform wear to the friction torque with uniform pressure is ______.

(a)

2/3
(b)

3/2
(c)

4/3
(d)

3/4
Answer:

Option (d)

16.

The frictional torque for the same diameter in a conical bearing is ________than in a flat bearing.

(a)

more
(b)

less
(c)

equal
(d)

may be more or less
Answer:

Option (a)

17.

For a safe design, a friction clutch is designed assuming ______.

(a)

uniform pressure theory
(b)

uniform wear theory
(c)

varying pressure theory
(d)

varying wear theory
Answer:

Option (b)

18.

No force is required for the downward motion of a load on a screw jack if ______.

(a)

α<Φ
(b)

α>Φ
(c)

α>2Φ
(d)

α<2Φ
Answer:

Option (b)

19.

In a multiple-friction clutch, the number of active friction surfaces is ________.

(a)

2 n
(b)

n
(c)

2 (n-1)
(d)

n-1
Answer:

Option (d)

20.

In a self-locking brake, the force required to apply the brake is ______.

(a)

minimum
(b)

zero
(c)

maximum
(d)

non-zero
Answer:

Option (b)

Showing 11 to 20 out of 77 Questions
1 2 3 4 5 6