Mostly, synchronous motors are of_____________?

A. Alternator type machines
B. Induction type machines
C. Salient pole type machines
D. Smooth cylindrical type machines

The working of a synchronous motor is similar to_____________?

A. Gear train arrangement
B. Transmission of mechanical power by shaft
C. Distribution transformer
D. Turbine

In a synchronous motor, the magnitude of stator back e.m.f. & depends on_______________?

A. D.c. excitation only
B. Speed of the motor
C. Load on the motor
D. Both the speed and rotor flux

The back e.m.f. of a synchronous motor depends on______________?

A. Speed
B. Load
C. Load angle
D. All of the above

A synchronous motor can be made self starting by providing?

A. Damper winding on rotor poles
B. Damper winding on stator
C. Damper winding on stator as well as rotor poles
D. None of the above

The shaft of synchronous motor is made of____________?

A. Mild steel
B. Chrome steel
C. Alnico
D. Stainless steel

The operating speed of a synchronous motor can be changed to new fixed value by___________?

A. Changing the load
B. Changing the supply voltage
C. Changing frequency
D. Using brakes

The maximum power developed in a synchronous motor occurs at a coupling angle of____________?

A. 30°
B. 60°
C. 90°
D. 180°

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

A synchronous motor running with normal excitation adjusts to load increases essentially by increase in______________?

A. Back e.m.f.
B. Armature current
C. Power factor
D. Torque angle