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Synchronous Motors
A synchronous machine with low value short circuit ratio has
Lower stability limit
Good voltage regulation
High stability limit
Good speed regulation
Lower stability limit
Good voltage regulation
High stability limit
Good speed regulation
Answer
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Related Question
Synchronous Motors
The capacity of a synchronous capacitor is generally in the range of
None of the listed here
VAR
kVAR
MVAR
None of the listed here
VAR
kVAR
MVAR
Answer
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Synchronous Motors
A synchronous motor connected to infinite bus-bars has at constant full load, 100% excitation and unity power factor. On changing the excitation only, the armature current will have
leading power factor with over-excitation
leading power factor with under-excitation
lagging power factor with over-excitation
no change of power factor
leading power factor with over-excitation
leading power factor with under-excitation
lagging power factor with over-excitation
no change of power factor
Answer
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Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that
its speed is independent of supply frequency
its power factor may be varied at will
None of these
its speed may be controlled more easily
its speed is independent of supply frequency
its power factor may be varied at will
None of these
its speed may be controlled more easily
Answer
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Synchronous Motors
Change of D.C. excitation of a synchronous motor changes
Applied voltage of the motor
Any of the above
Power factor of power drawn by the motor
Motor speed
Applied voltage of the motor
Any of the above
Power factor of power drawn by the motor
Motor speed
Answer
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Synchronous Motors
The net armature voltage of a synchronous motor is equal to the
vector sum of Eb and V
vector difference of Eh and V
arithmetic difference of Eb and V
arithmetic sum of Eb and V
vector sum of Eb and V
vector difference of Eh and V
arithmetic difference of Eb and V
arithmetic sum of Eb and V
Answer
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