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Electrical Machines

Electrical Machines
Pole changing methods are suitable only for ___________ type induction motor.

  wound.
  cage.
  linear.
  none of these.

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Electrical Machines
In travelling cranes for hoisting and lowering which type of motor is preferred?

  Single phase induction motor.
  DC series motor.
  Synchronous motor.
  AC slip ring motor.

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Electrical Machines
In case the conditions for maximum power for DC motor are established, the efficiency of the motor will be

 Less than 50 %
 Any where between 75 % and 90 %.
 Around 100 %.
 Around 90 %

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.25Ω.
  0.23Ω.
 1Ω.
 0.5Ω.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 200 V.
 800 V.
 400 V.
 100 V.

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Electrical Machines
In a DC generator sparking between brushes and commutator surface may be due to

  too rapid reversal of current.
  under commutation.
 over commutation.
  any of the above.

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