Question 1

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

Accepted Answer

A) True 
 B)False  False

Question 2

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

Accepted Answer

A) DC 
B) stator 
C) available 
D) contactor B

Question 3

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

Accepted Answer

A) True 
 B)False  False

Question 4

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.

Accepted Answer

A) True 
 B)False

Question 5

Synchronous motors are constructed almost exactly like alternators.

Accepted Answer

A) True 
 B)False

Question 6

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

Accepted Answer

A) rectifier 
B) brushless 
C) complementary 
D) supplementary

Question 7

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

Accepted Answer

A) cage 
B) main 
C) stator 
D) auxiliary

Question 8

A synchronous motor converts AC electrical energy into ______________power.

Accepted Answer

A) thermal 
B) hydraulic 
C) pneumatic 
D) mechanical

Question 9

AC loads generally have a lagging power factor.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A) field control and excitation are provided by a static system 
B) brush sparking is produced 
C) field excitation is manually removed whenever the motor is out of step 
D) manual resynchronization can be achieved whenever it is practical

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_____________ .