Question

To maintain a rotor at a uniform angular speed of $200\,rad\,s^{-1}$ an engine needs to transmit a torque of $180\,Nm$. The power of the engine required is (Assume the efficiency of the engine as 100%).

• A. 360 W
• B. 9000 W
• C. 36000 W
• D. 96000 W

Answer 1

Answer: (C)

36000 W

Answer 2

Using power P = $\tau \, \omega$ , we get P = 180 $\times$ 200 = 36000 W