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Synchronous Motors

Synchronous Motors
The back e.m.f. of a synchronous motor depends on

load
All of these
load angle
speed

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Synchronous Motors
When load on an over-excited or under excited synchronous motor is increased, rate of change of its armature current as compared with that of power factor is

twice
less
more
equal

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Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

None of the listed here
More than
Less than
About the same as

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Synchronous Motors
The standard full-load power factor ratings for synchronous motors are

unity or 0.8 leading
unity or 0.8 lagging
unity or zero
zero or 0.8 leading

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Synchronous Motors
The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

None of these
pull-in torque
pull-up torque
pull-out torque

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Synchronous Motors
The back emf in the stator of a synchronous motor depends on

Rotor excitation
Rotor speed
Flux density
None of the listed here

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MORE MCQ ON Synchronous Motors

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