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Synchronous Motors

Synchronous Motors
The efficiency of a properly designed synchronous motor will usually fall in range

60 to 70%
85 to 95%
99 to 99.5%
75 to 80%

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Synchronous Motors
The rotor of a synchronous motor is

Nonsalient pole type
Identical to that of a dc motor
None of the listed here
Salient pole type

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Synchronous Motors
A synchronous motor will always stop when

Supply voltage fluctuates
Excitation winding gets disconnected
Supply voltage frequency changes
Load in motor varies

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Synchronous Motors
The pull out torque of a synchronous motor is generally ______ times its full-load torque.

5 to 10
1.25 to 3.5
0.5
6 to 9

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Synchronous Motors
The capacity of a synchronous capacitor is generally in the range of

VAR
kVAR
None of the listed here
MVAR

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Synchronous Motors
In a synchronous motor, the rotor copper loss are met by ______

Motor input
Supply lines
Dc source
Armature input

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