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Synchronous Motors

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

Armature input
Supply lines
Dc source
Motor input

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Synchronous Motors
By which of the following methods the constant speed of a synchronous motor can be changed to new fixed value ?

By changing the supply frequency
By changing the load
By changing the applied voltage
By interchanging any two phases

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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Motor speed
Power factor of power drawn by the motor
Any of the above
Applied voltage of the motor

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Synchronous Motors
A synchronous motor develops maximum power when load angle is

90°
45°
120°
60°

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Synchronous Motors
The operating speed of a synchronous motor can be changed to new fixed value by

changing the load
changing frequency
changing the supply voltage
using brakes

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Synchronous Motors
The duration of sudden short-circuit test on a synchronous motor is usually about

one second
one minute
None of these
one hour

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