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Electrical Machines

Electrical Machines
which of the following losses are negligible in blocked rotor test?

 both A and B
 copper loss
 iron loss
 mechanical loss

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

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

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Electrical Machines
Series booster is a

 separately excited DC generator.
  series wound DC generator.
 shunt wound DC generator.
 permanent magnet DC generator.

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Electrical Machines
Fufuraldehyde analysis is done to determine the

 condition of lamination on CRGO steel sheet.
 condition of oil in transformer.
  condition of paper insulation in transformer.
 condition of cork gaskets used in transformer.

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 20 V.
 60 V.
  40 V.
 0 V.

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Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 core.
 armature.
 none of these.

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