SYNCHRONOUS MOTOR-2

11. For V-curves for a synchronous motor the graph is drawn between ______________

field current and armature current

terminal voltage and load factor

power factor and field current

armature current and power factor

12. In a synchronous motor which loss varies with load?

windage loss

bearing friction loss

copper loss

core loss

13. The oscillations in a synchronous motor can be damped out by ____________

maintaining constant excitation

running the motor on leading power factors

providing damper bars in the rotor pole faces

oscillations cannot be damped

14. When the field of a synchronous motor is under-excited, the power factor will be _______

leading

lagging

unity

zero

15. The percentage slip in case of a synchronous motor is _____________

100%

0.5%

zero

16. Synchronous motors are ____________

not self-starting

self-starting

essentially self-starting

none of the above

17. A synchronous motor working at leading power factor can be used as ___________

voltage booster

phase advancer

noise generator

mechanical synchronizer

18. An over-excited synchronous motor is used for __________

filctuating loads

variable speed loads

low torque loads

power factor corrections

19. The speed of the synchronous motor ___________

increases with increase in load

decreases as load increases

varies with power factor

always remains constant

20. The armature current of the synchronous motor has higher values for __________

high excitation only

low excitation only

both a & b

none of the above

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