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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________
30° electrical
90° electrical
0° electrical
45° electrical
30° electrical
90° electrical
0° electrical
45° electrical
Answer
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Related Question
Synchronous Motors
The shaft of synchronous motor is made of
Stainless steel
Mild steel
Alcino
Chrome steel
Stainless steel
Mild steel
Alcino
Chrome steel
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
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
leading power factor with under-excitation
Answer
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Synchronous Motors
A synchronous motor is a ______ motor.
Singly fed
None of the listed here
Variable speed
Variable pf
Singly fed
None of the listed here
Variable speed
Variable pf
Answer
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Synchronous Motors
In a synchronous motor, the magnitude of stator back emf depends on _____
Load on the motor
Dc excitation only
Both the speed and rotor flux
Speed of the rotor
Load on the motor
Dc excitation only
Both the speed and rotor flux
Speed of the rotor
Answer
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Synchronous Motors
A synchronous motor will always stop when
Supply voltage frequency changes
Excitation winding gets disconnected
Load in motor varies
Supply voltage fluctuates
Supply voltage frequency changes
Excitation winding gets disconnected
Load in motor varies
Supply voltage fluctuates
Answer
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