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Synchronous Motors
A synchronous motor can develop synchronous torque
while over-excited
when under loaded
below or above synchronous speed
only at synchronous speed
while over-excited
when under loaded
below or above synchronous speed
only at synchronous speed
Answer
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Related Question
Synchronous Motors
While running, a synchronous motor is compelled to run at synchronous speed because of _______
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles
Induced emf in rotor field winding by stator flux
Damper winding in its pole faces
Compulsion due to lenz's law
Magnetic locking between stator and rotor poles
Answer
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Synchronous Motors
The pull out torque of a practical synchronous motor will occur when the torque angle is about _____
0°
30°
45°
75°
0°
30°
45°
75°
Answer
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Synchronous Motors
When a synchronous motor is on no load, the torque angle is about ________
45° electrical
90° electrical
30° electrical
0° electrical
45° electrical
90° electrical
30° electrical
0° electrical
Answer
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Synchronous Motors
The speed of a synchronous motor
Decreases as the load decreases
None of the listed here
Increases as the load increases
Always remains constant
Decreases as the load decreases
None of the listed here
Increases as the load increases
Always remains constant
Answer
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Synchronous Motors
The back e.m.f. of a synchronous motor depends on
speed
load
load angle
All of these
speed
load
load angle
All of these
Answer
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