__Question 7.15__:^{–1}, an engine needs to transmit a torque of 180 Nm. What is the power required by the engine?

(Note: uniform angular velocity in the absence of friction implies zero torque. In practice, applied torque is needed to counter frictional torque). Assume that the engine is 100 % efficient.

__Solution__:Torque required, τ = 180 Nm

The power of the rotor (

*P*) is related to torque and angular speed by the relation:

*P*= τω

= 180 × 200 = 36 × 10

^{3}

= 36 kW

Hence, the power required by the engine is 36 kW.

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