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Electrical Machines

Electrical Machines
In an induction motor, what is the ratio of rotor input to rotor copper loss?

 S
 1-S
 1/(1-S)
 1/S

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Electrical Machines
In induction motors, there is large decrease in maximum power factor when the dispersion coefficient is ________________.

 remains same.
 decreased.
 kept constant to certain value.
  increased.

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Electrical Machines
In field flux method speed control of DC Motor is

 constant hp drive below the base speed.
 constant torque drive below the base speed.
 constant power drive above base speed.
 constant torque drive above the base speed.

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Electrical Machines
The primary and secondary windings of a transformer are

 electrically linked.
  inductively linked.
 mechanically linked.
  conductively linked.

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Electrical Machines
In a DC generator the emf generated by the armature is maximum when

 rate of change of flux is minimum.
  rate of change of flux is maximum.
 shaft rotation is high.
 induced voltage is high.

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Electrical Machines
An induction motor is, in general analogous to

 two winding transformer with secondary open circuited.
 two winding transformer with secondary short circuited.
None of these
 auto transformer.

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