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Electrical Machines
In a DC machine, which of these parameters remain the same whether it runs as a DC motor or a DC generator?
Mechanical power.
Armature current.
Induced emf.
Can not be determined.
Mechanical power.
Armature current.
Induced emf.
Can not be determined.
Answer
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Related Question
Electrical Machines
The sequence of induction motor is RYB, then the direction of induction motor can be changed by which of the following sequence?
RBY
All of these
BYR
BRY
RBY
All of these
BYR
BRY
Answer
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Electrical Machines
The speed of a cumulatively compound DC motor can be controlled by varying
Shunt field resistance control.
Armature voltage control.
Any of above.
Armature resistance control.
Shunt field resistance control.
Armature voltage control.
Any of above.
Armature resistance control.
Answer
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Electrical Machines
Cogging of induction motor occurs at
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.
high voltage and when stator and rotor poles are not equal.
Answer
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Electrical Machines
A frog leg winding is used in a DC machine to eliminate
the use drum winding.
the use equalizer in lap winding.
the use of compensating winding.
reactance voltage produced due to communication.
the use drum winding.
the use equalizer in lap winding.
the use of compensating winding.
reactance voltage produced due to communication.
Answer
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Electrical Machines
Two mechanically coupled alternators deliver power at 50 Hz and 60 Hz respectively. The highest speed of the alternators is
500 rpm.
3600 rpm.
600 rpm.
3000 rpm.
500 rpm.
3600 rpm.
600 rpm.
3000 rpm.
Answer
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