Engineering Questions with Answers - Multiple Choice Questions
Machine Dynamics MCQ – Differential Band Brake
1 - Question
When the fulcrum is between the two ends of a lever, the type of brake is _____
a) Simple band brake
b) Differential band brake
c) Shoe brake
d) Double block shoe brake
View Answer
Answer: b
Explanation: When the fulcrum is at one end of the lever, the brake is called a simple band brake, whereas when the fulcrum is between the two ends it is known as differential band brake.
2 - Question
For a simple band brake, the fulcrum is at the end of the lever.
a) True
b) False
View Answer
Answer: a
Explanation: For a simple band brake, the fulcrum is at the end of the lever and for a differential band brake, the fulcrum is between the ends of the lever.
3 - Question
For the given figure, the brake can sustain a torque of 350 N-m and coefficient of friction between the band and drum is 0.3, find necessary force required for clockwise rotation of the drum in N.
a) 32
b) 64
c) 96
d) 128
View Answer
Answer: b
Explanation: 2.3 log(T1/T2) = μ.θ = 0.3×3.93 = 1.179
log(T1/T2) = 1.129/2.3
= 0.51
T1/T2 = 3.255
Braking torque = (T1-T2)r
T1-T2 = 2000
therefore T1 = 2887N T2 = 887N
Px500 = T2x150 – T1x35
P = 64N.
4 - Question
For the given figure, the brake can sustain a torque of 350 N-m and coefficient of friction between the band and drum is 0.3, If the drum rotates in anticlockwise direction, find force in N.
a) 804
b) 756
c) 850
d) 900
View Answer
Answer: a
Explanation: 2.3 log(T1/T2) = μ.θ = 0.3×3.93 = 1.179
log(T1/T2) = 1.129/2.3
= 0.51
T1/T2 = 3.255
Braking torque = (T1-T2)r
T1-T2 = 2000
therefore T1 = 2887N T2 = 887N
Px500 = T1x150 – T2x35
P = 804N.
5 - Question
For the given figure, the brake can sustain a torque of 350 N-m and coefficient of friction between the band and drum is 0.3, find OA for self locking condition during clockwise rotation.
a) 114mm
b) 130mm
c) 57mm
d) 88mm
View Answer
Answer: a
Explanation: For self locking condition, P=0
therefore T1x35 = T2xOA
OA = 114mm.
6 - Question
Which of the following brake does not has self locking?
a) Disk
b) Differential band
c) Simple band
d) Depends on the acting force
View Answer
Answer: a
Explanation: Disk brakes do not have self locking However, it is possible to achieve self locking in differential band brakes.
7 - Question
Braking torque is independent of the radius of drum.
a) True
b) False
View Answer
Answer: b
Explanation: Braking torque is given by the equation
T = (T1-T2)r
hence it is directly proportional to the radius of the drum.
8 - Question
With the help of following data, calculate the braking torque in N-m.
T1 = 2500 N
T2 = 200 N
diameter of drum = 350mm
a) 402.5
b) 805
c) 201.5
d) 560
View Answer
Answer: a
Explanation: T = T = (T1-T2)r
r = 350/2000
T = (2500-200)350/2000
= 2300×350/2000 N-m
= 402.5 N-m.