Question 1

A rotory converter can also be run as a

Accepted Answer

A) d.c. shunt motor 
B) d.c. series motor 
C) d.c. compound motor 
D) synchronous motor

Question 2

The net armature voltage of a synchronous motor is equal to the

Accepted Answer

A) vector sum of Eb and V 
B) arithmetic sum of Eb and V 
C) arithmetic difference of Eb and V 
D) vector difference of Eh and V

Question 3

Hunting in a synchronous motor cannot be due to

Accepted Answer

A) windage friction 
B) variable load 
C) variable frequency 
D) variable supply voltage

Question 4

The induced e.m.f. in a synchronous motor working on leading power factor will be

Accepted Answer

A) more than the supply voltage 
B) less than the supply voltage 
C) equal to the supply voltage 
D) none

Question 5

In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then

Accepted Answer

A) the motor is said to be fully loaded 
B) the torque generated is maximum 
C) the excitation is said to be zero per cent 
D) the excitation is said to be hundred per cent

Exam 2: Synchronous Motor: Part B

A rotory converter can also be run as a

The net armature voltage of a synchronous motor is equal to the

Hunting in a synchronous motor cannot be due to

The induced e.m.f. in a synchronous motor working on leading power factor will be

In a synchronous motor it the back e.m.f. generated in the armature at noload is approximately equal to the applied voltage, then