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Synchronous Motors
The minimum armature current of the synchronous motor corresponds to operation at
0.707 power factor leading
0.707 power factor lagging
zero power factor leading
unity power factor
0.707 power factor leading
0.707 power factor lagging
zero power factor leading
unity power factor
Answer
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Related Question
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 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
leading power factor with over-excitation
Answer
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Synchronous Motors
A synchronous motor can be made self starting by providing
Damper winding on rotor poles
None of the listed here
Damper winding on stator as well as rotor poles
Damper winding on stator
Damper winding on rotor poles
None of the listed here
Damper winding on stator as well as rotor poles
Damper winding on stator
Answer
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Synchronous Motors
The rotor of a synchronous motor is
Salient pole type
None of the listed here
Identical to that of a dc motor
Nonsalient pole type
Salient pole type
None of the listed here
Identical to that of a dc motor
Nonsalient pole type
Answer
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Synchronous Motors
A synchronous machine with large air gap has
a higher synchronizing power which makes the machine less sensitive to load variations
a small value of inherent regulation
a higher value of stability limit
all of the listed here
a higher synchronizing power which makes the machine less sensitive to load variations
a small value of inherent regulation
a higher value of stability limit
all of the listed here
Answer
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Synchronous Motors
A synchronous motor is a ______ motor.
Variable pf
Singly fed
None of the listed here
Variable speed
Variable pf
Singly fed
None of the listed here
Variable speed
Answer
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