Exam 39: Synchronous Motor Operation

The rotor is excited by a source of direct current so that it produces simultaneous north and south poles.

The synchronous motor sets up a rotating field through_______ coils energized by alternating current.

A disadvantage of the synchronous motor equipped with a brushless exciter is that brush sparking is eliminated.

A distinguishing feature of the synchronous motor is that it runs without slip at a speed determined by the frequency of the connected power source and the number of poles it contains.

Synchronous motors are constructed almost exactly like alternators.

A method for applying excitation current to the rotor is with a_____________ exciter.

The rotor must have the same number of poles as the_________________ .

A synchronous motor converts AC electrical energy into ______________power.

AC loads generally have a lagging power factor.

An advantage of the synchronous motor equipped with a brushless exciter is that_____________ .