Machine Dynamics Questions and Answers – Dynamometer

This set of Machine Dynamics Multiple Choice Questions & Answers (MCQs) focuses on “Dynamometer”.

1. Which of the following is a characteristic feature of a dynamometer?
a) It can measure torque
b) It can measure frictional resistance
c) It can measure the balancing force
d) It can act as a speedometer
View Answer

Answer: b
Explanation: Dynamometer is a device that acts as a brake but in addition to this, it can also measure frictional resistance and can measure the power of the engine.

2. Prony brake dynamometer is an absorption dynamometer.
a) True
b) False
View Answer

Answer: b
Explanation: Pronybrake dynamometer absorbs all the energy produced by the engine through frictional resistances hence it is an absorption dynamometer.

3. In which of the following dynamometers does the entire energy or power produced by the engine is absorbed by the friction resistances of the brake?
a) Prony brake dynamometer
b) Torsional dynamometer
c) Epicyclic train dynamometer
d) Belt transmission dynamometer
View Answer

Answer: a
Explanation: Prony brake dynamometer is an absorption dynamometer, in absorption dynamometers the entire energy or power produced by the engine is absorbed by the friction resistances of the brake and is transformed into heat.
advertisement
advertisement

4. In which of the following dynamometers does the energy produced by the engine is used for doing work?
a) Prony brake dynamometer
b) Rope brake dynamometer
c) Absorption dynamometer
d) Epicyclic train dynamometer
View Answer

Answer: d
Explanation: An epicyclic train dynamometer is an example of transmission dynamometer. In these types of dynamometers the energy is not wasted in friction but is used for doing work.

5. Flywheel diameter 1.2 m; diameter of the rope 12.5 mm; engine speed 200 r.p.m.; dead load on the brake 600 N; spring balance reading 150 N. Using this data, calculate the brake power of the engine in kW.
a) 5.715
b) 5.525
c) 6.125
d)5.625
View Answer

Answer: a
Explanation: The brake power of an engine is given by the relation:
B.P = [(W-S)π (D+d)N]/60
= 5715 W.
Note: Join free Sanfoundry classes at Telegram or Youtube

6. Flywheel diameter 1.2 m; diameter of the rope 12.5 mm; engine speed 400 r.p.m.; dead load on the brake 600 N; spring balance reading 150 N. Using this data, calculate the brake power of the engine in kW.
a) 12.82
b) 11.43
c) 13.64
d) 10.22
View Answer

Answer: b
Explanation: The brake power of an engine is given by the relation:
B.P = [(W-S)π (D+d)N]/60
= 11430 W.

7. For a rope brake dynamometer, the flywheel is cooled with soapy water because________
a) Energy is absorbed by the dynamometer
b) Energy is used to do work
c) Energy is provided by the motor
d) Energy supplied is more
View Answer

Answer: a
Explanation: A rope brake dynamometer is an example of absorption dynamometer, in absorption dynamometers the entire energy or power produced by the engine is absorbed by the friction resistances of the brake and is transformed into heat. Hence to overcome this soapy water is used.
advertisement

8. Belt transmission dynamometer is an absorption dynamometer.
a) True
b) False
View Answer

Answer: b
Explanation: Belt transmission dynamometer is a transmission dynamometer as a result the energy is not wasted in friction but is used for doing work.

9. For which of the following dynamometers the driving torque on the shaft is not uniform and it is subjected to severe oscillations?
a) Pony brake
b) Band brake
c) Belt transmission
d) Epicyclic train
View Answer

Answer: a
Explanation: For a pony brake dynamometer, When the driving torque on the shaft is not uniform, it is subjected to severe oscillations.
advertisement

Sanfoundry Global Education & Learning Series – Machine Dynamics.

To practice all areas of Machine Dynamics, here is complete set of 1000+ Multiple Choice Questions and Answers.

If you find a mistake in question / option / answer, kindly take a screenshot and email to [email protected]

advertisement
advertisement
Subscribe to our Newsletters (Subject-wise). Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Join our social networks below and stay updated with latest contests, videos, internships and jobs!

Youtube | Telegram | LinkedIn | Instagram | Facebook | Twitter | Pinterest
Manish Bhojasia - Founder & CTO at Sanfoundry
Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

Subscribe to his free Masterclasses at Youtube & discussions at Telegram SanfoundryClasses.