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Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because
The back e.m.f. decreases causing an increase in motor current
The increased load has to take more current
The rotor by shifting its phase backward causes motor to take more current
The rotor strengthens the rotating field causing more motor current
The back e.m.f. decreases causing an increase in motor current
The increased load has to take more current
The rotor by shifting its phase backward causes motor to take more current
The rotor strengthens the rotating field causing more motor current
Answer
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Related Question
Synchronous Motors
In a 3-phase synchronous motor, the negative phase sequence exists when the motor is
under-loaded
supplied with unbalanced voltage
over-loaded
None of these
under-loaded
supplied with unbalanced voltage
over-loaded
None of these
Answer
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Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by
induction motor torque in field winding
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces
All of the listed here
induction motor torque in field winding
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces
All of the listed here
Answer
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Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____
None of the listed here
Approches synchronous speed
Is at standstill
Approches half synchronous speed
None of the listed here
Approches synchronous speed
Is at standstill
Approches half synchronous speed
Answer
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Synchronous Motors
An over excited synchronous motor behaves as _____
A resistor
None of the listed here
A capacitor
An inductor
A resistor
None of the listed here
A capacitor
An inductor
Answer
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Synchronous Motors
Which of the following motors is non self starting?
Synchronous motor
Wound rotor induction motor
Squirrel cage induction motor
Dc series motor
Synchronous motor
Wound rotor induction motor
Squirrel cage induction motor
Dc series motor
Answer
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