Machine Design Multiple Choice Questions on “Band Brakes & Disk Brakes”.
1. In both simple band brake and differential band brake, at least one end of the band passes through fulcrum.
a) Both the ends
b) Neither end
c) One end
d) None of the listed
Answer: b
Clarification: In differential, neither end of the brake passes through fulcrum.
2. Is it possible to prevent back rotation of drum?
a) Yes by using back stop brake
b) No
c) Depends on the angular velocity
d) Only in some specific cases
Answer: a
Clarification: Back stop brake can be used to prevent rotation of drum.
3. A self-locking differential brake and back stop brakes is same thing.
a) True
b) False
Answer: a
Clarification: Back stop brake is other name of self locking differential brake.
4. Band brake has complex construction with large number of parts.
a) Yes
b) It has simple construction
c) It has simple constructions but large number of parts
d) It has complicated construction but small number of parts
Answer: b
Clarification: Band brake has simple construction with small number of parts.
5. Band brakes require _____ maintenance.
a) Little
b) Zero
c) Much
d) None of the listed
Answer: a
Clarification: There is relatively less maintenance required as there are small number of parts and hence chances of brake going out of order is less.
6. The wear of band brake is even.
a) True
b) False
Answer: b
Clarification: There is uneven wear from one side to other side of the friction lining.
7. Calculate the braking torque if tension in the two sides is 3500N and 1980N with radius of drum being 160mm.
a) None of the mentioned
b) 243.20N-m
c) 223.4N-m
d) 278.6N-m
Answer: b
Clarification: Braking torque=(3500-1980)x160/1000.
8. Disk brakes have low torque transmitting capacity in high volumes.
a) True
b) False
Answer: b
Clarification: They have high torque transmitting capacity in low volumes.
9. In drum brakes, as the temperature increases coefficient of friction ______
a) increases
b) decreases
c) remains same
d) Can’t be determined
Answer: d
Clarification: Coeffecient of friction varies inversely with the temperature.
10. Loss of torque transmitting capacity at high temperatures is called
a) Fading
b) Rolling
c) Drifting
d) Planking
Answer: a
Clarification: Terminology.
11. Disk brakes largely suffer from the problem of self-locking.
a) Yes
b) No
c) Self-locking but it depends on radius of the wheel rotating
d) Material dependent
Answer: b
Clarification: There is no problem of self-locking in disk brakes.
12. Disk brakes can be used for opposite rotation of disk also.
a) No they are effective for one direction of motion only
b) They can be used
c) Poor efficiency in opposite direction
d) None of the listed
Answer: a
Clarification: Disk brakes are equally effective for both direction of motion.
13. The disk brake torque is linearly proportional to the actuating force.
a) Yes
b) No, it is proportional to its square
c) Proportional to its cube
d) Independent of force