MCQs on Internal Expanding Brake
1 - Question
The intensity of normal pressure between the friction lining and the brake drum at any point is proportional to square of the vertical distance from the pivot.
a) It is independent
b) Proportional to vertical distance linearly
c) Inversely proportion to vertical distance
d) None of the listed
View Answer
Answer: b
Explanation: It is proportional to the vertical distance linearly.
2 - Question
The coefficient of friction in internally expanding brakes is constant.
a) True
b) No, it varies with increase in speed linearly
c) It decreases with increase in speed linearly
d) None of the listed
View Answer
Answer: a
Explanation: Coefficient of friction is constant in these types of brakes.
3 - Question
The centrifugal force acting on the shoe can never be omitted.
a) True
b) Always omitted
c) Depends on the magnitude
d) There is no centrifugal force acting
View Answer
Answer: b
Explanation: Centrifugal force on the internal expanding brakes is generally neglected as it is very small.
4 - Question
These kinds of brakes require little maintenance.
a) Yes
b) No
c) Very much maintenance is required
d) Depends on the working environment
View Answer
Answer: a
Explanation: Very little maintenance is required as there is less wear.
5 - Question
In internally expanding brake, a large actuating force produces a small braking torque and hence this brake isn’t used generally.
a) True
b) No, small actuating braking torque is produces
c) Zero actuating force is required
d) None of the listed
View Answer
Answer: b
Explanation: Small actuating force produce large braking torque.
6 - Question
Heat dissipating capacity of internally expanding brakes is a problem.
a) True
b) No
c) There is no heat generated
d) Heat is convected away on its own
View Answer
Answer: a
Explanation: It has relatively poor dissipation of heat.
7 - Question
Internally expanding brakes never suffer the problem of self-locking.
a) True
b) Wear might lead to self-locking
c) Brakes are never self-locked
d) None of the listed
View Answer
Answer: b
Explanation: Due to improper design, wear may be caused which might lead to self-locking of brakes.
8 - Question
Moment of normal force and frictional forces about the pivot axis are 640000N-mm and 250000N-mm respectively. If force acts at a distance of 190mm from the pivoted point, calculate the actuating force.
a) 1078.6N
b) 2052.6N
c) 3223.5N
d) 4454.5N
View Answer
Answer: b
Explanation: P=M(n)-M(f)/C.
9 - Question
Preloading is recommended for bearings.
a) True
b) False
View Answer
Answer: a
Explanation: Preloading removes the internal clearances.
10 - Question
Needles bearings have not much load capacity as they are quite small.
a) True
b) False
View Answer
Answer: b
Explanation: Needle bearings have quite large loading capacity as compared to their size.