synchronous motors MCQs – Page 7

Practise focused synchronous motors questions with marked answers for exam preparation and subject revision.

synchronous motors Mcqs
121. The synchronous motor is not inherently self-starting because_______________?
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A. the rotating magnetic field is produced by only 50 Hz frequency currents

B. the force required to accelerate the rotor to the synchronous speed in an instant is absent

C. the starting device to accelerate the rotor to near synchronous speed is absent

D. a rotating magnetic field does not have enough poles

122. As the load is applied to a synchronous motor, the motor takes more armature current because
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A. the rotor strengthens the rotating field casuing more motor current

B. the rotor by shifting its phase backward causes motor to take more current

C. the increased load has to take more current

D. the back e.m.f. decreases causing an increase in motor current