An induction motor can run at synchronous speed when________?
Ait is run on voltage higher than the rated voltage
Be.m.f. is injected in the rotor circuit
Cit is run on load
Dit is run in reverse direction
Correct answer
B. e.m.f. is injected in the rotor circuit
Explanation
The correct answer is e.m.f. is injected in the rotor circuit.