# Brakes and Dynamometers - Mechanical Engineering (MCQ) questions and answers

1)   If brakes are applied on front wheels of a car and if it moves on a level road, then retardation of the car is calculated using the formula

a. μ g
b. [μ g (l-x)] / (l + μ h)
c. (μ g x) / (l- μ h)
d. none of the above
 Answer  Explanation ANSWER: (μ g x) / (l- μ h) Explanation: No explanation is available for this question!

2)   Double block brake is a type of

a. Band brake
b. Internal expanding shoe brake
c. Shoe brake
d. None of the above
 Answer  Explanation ANSWER: Shoe brake Explanation: No explanation is available for this question!

3)   Which energy is absorbed by the brakes of an elevator during braking process?

a. Potential energy
b. Kinetic energy
c. Both a. and b.
d. None of the above
 Answer  Explanation ANSWER: Potential energy Explanation: No explanation is available for this question!

4)   In single shoe brake, when is uniform normal pressure observed between block and drum?

a. θ < 60o
b. 2θ < 90o
c. 2θ < 60o
d. θ > 30o
 Answer  Explanation ANSWER: 2θ < 60o Explanation: No explanation is available for this question!

5)   Which type of brakes have wooden blocks placed inside flexible steel band?

a. Block brake
b. Band brake
c. Band and Block brake
d. Pivoted block brake
 Answer  Explanation ANSWER: Band and Block brake Explanation: No explanation is available for this question!

6)   In the equation Rn = (pl) / (x – μ.a), if x < μ.a then the brakes are

a. self energizing
b. self locking
c. self starting
d. None of the above
 Answer  Explanation ANSWER: self locking Explanation: No explanation is available for this question!

7)   Determine the power transmitted if dead weight on brake is 70 kg and engine has a speed of 300 rpm. One end of the rope has a diameter of 0.05 m is attached to a spring balance which has reading of 150 N, diameter of drum is 1 m.

a. 8.851 kW
b. 8.851 W
c. 1319.46 W
d. none of the above
 Answer  Explanation ANSWER: 8.851 kW Explanation: No explanation is available for this question!

8)   Which parameters can be measured using a dynamometer?

a. Force
b. Torque
c. Power
d. All of the above
 Answer  Explanation ANSWER: All of the above Explanation: No explanation is available for this question!

9)   Identify the type of absorption dynamometer ?

a. Epicyclic dynamometer
b. Prony brake dynamometer
c. Torsion dynamometer
d. Tatham dynamometer
 Answer  Explanation ANSWER: Prony brake dynamometer Explanation: No explanation is available for this question!

10)   Which of the following statements is/are false?

a. To prevent heat generated due to friction, rope brake dynamometers are provided with cooling water
b. Angle of twist upto 1/10 of degree can be measured by Glibson flash light torsion dynamometer
c. In pneumatic brakes, the ratio between hydraulic pressure and air pressure is 15:1
d. All the above statements are false
 Answer  Explanation ANSWER: Angle of twist upto 1/10 of degree can be measured by Glibson flash light torsion dynamometer Explanation: No explanation is available for this question!