When maximum starting torque is obtained, the rotor power is

Electrical Engineering XYZ MCQs

When maximum starting torque is obtained, rotor power is:

1. 0.707 lagging
2. Zero
3. Unity
4. 0.5 lagging

Correct answer: 1. 0.707 lagging

Explanation: The maximum starting torque is obtained in motor when rotor power is 0.707 lagging.

This shows the current lags behind the voltage by an angle whose cosine is 0.707, under conditions where the rotor’s resistive and reactive components contribute equally to the impedance.