11. Power factor of a synchronous motor is unity when
12. In a 3-phase, 4-pole, 50 Hz synchronous motor, the frequency, pole number and load torque all are halved. The motor speed will be
13. Which of the following motors is non-self starting ?
14. Which of the following losses, in a synchronous motor, does not vary with load?
15. Stability of a synchronous machine
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