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Electrical Machines

Electrical Machines
The output power of a dc motor is given by

  EbIa.
  EIa.
  none of these.
  EbIa2.

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Electrical Machines
Star - delta method of starting of motor is not possible in case of

  single phase induction motor.
  high speed motor.
  low horse power motor.
  high torque motor.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 100 V.
 50 V.
 399 V.
  230.2 V.

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Electrical Machines
The commutator segments of DC machines are made up of

 hard-drawn copper
 brass
 copper alloy
 copper

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Electrical Machines
The torque developed in IM is nearly proportional to

  V.
  V2.
  1 / V.
 1 / V2.

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Electrical Machines
The main disadvantage(s) of the ward-Leonard system is/are

 poor overall efficiency.
 high maintenance cost.
 all of above.
 high initial cost.

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MORE MCQ ON Electrical Machines

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