A rotating machine is maintained at a uniform angular speed of 150 rad s-1, with a torque of 100 Nm. The power is
15 kW
1.5 kW
0.15 kW
1500 W
To maintain a rotor at a uniform angular speed of 200 rads−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.
The input power to a machine is 1500 W. And its efficiency is 80%. Then the output power by the machine is :
To maintain a rotor at a uniform angular speed of 200 rad/s, an engine needs to transmit a torque of 180 N m. 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.