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Electrical Machines

Electrical Machines
Dynamic braking is employed to brake

None of these
 reversing drive
 non reversing drive
 both 1 and 2

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Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 increase the permeability.
 reduce both eddy current and hysteresis loss.
 reduce hysteresis loss only.

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Electrical Machines
Transformer oil is used as

 a coolant.
 an insulator.
 inert medium.
 both A and B.

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Electrical Machines
In an auto transformer, for what value of turn ratio, power transferred by inductively and conductively are same?

 0
 1
 any of the above
 0.5

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Electrical Machines
Reluctance and hysteresis motors are the types of which electrical motor?

  1 - Φ synchronous motor.
 3 - Φ induction motor.
 DC motor.
 Stepper motor.

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Electrical Machines
In which of the following speed control of DC motor the speed obtained is below than the rated speed?

 Any of above.
 Armature circuit resistance control.
 Armature voltage control.
 Field resistance control.

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