Computer Programming MCQs

5739 MCQs  (Page 82 of 574)

The speed of a synchronous motor:
A. Increases as the load increases
B. Decreases as the load decreases
C. Always remains constant
D. None of the above
Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor ?
A. Phase to phase winding resistance
B. Stator winding to earthed frame
C. Rotor winding to earthed shaft
D. All of the above
The induced e.m.f. in a synchronous motor working on leading power factor will be_____________?
A. More than the supply voltage
B. Less than the supply voltage
C. Equal to the supply voltage
D. None of these
The magnitude of field flux in a 3-phase synchronous motor?
A. Varies with power factor
B. Varies with speed
C. Varies with the load
D. Remains constant at all loads
Which of the following motors is non-self starting ?
A. D.c. series motor
B. Synchronous motor
C. Squirrel cage induction motor
D. Wound round induction motor
Exciters of synchronous machines are______________?
A. D.c. series machines
B. D.c. shunt machines
C. D.c. compound machines
D. Any of the above
The armature current of the synchronous motor
A. Has large values for low excitation i niy
B. Has large values for high excitation only
C. Has large values for low and high excitation
D. Any of the above