Question

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

I have been asked this question by my school principal while I was bunking the class.

This question is from Dynamometer in division Brakes and Dynamometers of Machine Dynamics

Answer 1

The correct option is (a) Energy is absorbed by the dynamometer

To explain: 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.