Synchronous Motors MCQ Questions & Answers | Electrical Engineering

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1.
The maximum power developed in a synchronous motor occurs at a coupling angle of

A. 30°

B. 60°

C. 90°

D. 180°

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2.
When the stator windings are connected in such a fashion that the number of poles are made half, the speed of the rotor of a synchronous motor

A. remains same as the original value

B. decreases to half the original value

C. tends to becomes zero

D. increases to two times the original value

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3.
The speed of a synchronous motor

A. increases as the load increases

B. decreases as the load decreases

C. always remains constant

D. none of the above

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4.
In which of the following motors the stator and rotor magnetic field rotate at the same speed ?

A. Universal motor

B. Synchronous motor

C. Induction motor

D. Reluctance motor

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5.
In a synchronous motor, the breakdown torque is

A. directly proportional to applied voltage

B. directly proportional to the square of the applied voltage

C. inversely proportional to applied voltage

D. none of the above

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