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Electrical Machines
Cogging of induction motor occurs at
high voltage and when stator and rotor poles are not equal.
high voltage and when stator and rotor poles are equal.
low voltage and when stator and rotor poles are equal.
low voltage and when stator and rotor poles are not equal.
high voltage and when stator and rotor poles are not equal.
high voltage and when stator and rotor poles are equal.
low voltage and when stator and rotor poles are equal.
low voltage and when stator and rotor poles are not equal.
Answer
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Related Question
Electrical Machines
In which of the following motors DC excitation is not required?
3-phase synchronous motor
reluctance motor
3-phase synchronous generator
hysteresis motor
3-phase synchronous motor
reluctance motor
3-phase synchronous generator
hysteresis motor
Answer
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Electrical Machines
In a transformer zero voltage regulation is achieved at a load power factor which is
leading
unity
zero
lagging
leading
unity
zero
lagging
Answer
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Electrical Machines
A frog leg winding is used in a DC machine to eliminate
the use of compensating winding.
the use equalizer in lap winding.
reactance voltage produced due to communication.
the use drum winding.
the use of compensating winding.
the use equalizer in lap winding.
reactance voltage produced due to communication.
the use drum winding.
Answer
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Electrical Machines
A synchorous generator connected to an infinite bus is over excited. Considering only the reactive power from the point view of the system the machine acts as
A capacitor.
None of these.
A resistor.
an inductor.
A capacitor.
None of these.
A resistor.
an inductor.
Answer
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Electrical Machines
Which of the following is the largest conversion device?
DC machine
Synchronous machine
All of these
Induction machine
DC machine
Synchronous machine
All of these
Induction machine
Answer
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