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Electrical Machines

Electrical Machines
What are slot wedges in a DC machine made of?

 Mild steel.
 Silicon steel.
 Fibre.
 Cast iron.

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Electrical Machines
Essential conditions for two DC generators are connecting for parallel operation is/are

 polarities should be same.
 both A and B.
 rating of generators should be same.
 terminal voltage should be same.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 Compounded DC generator.
 DC series generator.
 None of these.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 10 KW.
 8 KW.
 0.
  2 KW.

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Electrical Machines
The leakage reactance of a 3-phase alternator is determined by performing

 short circuit and slip tests.
 open circuit and zero power factor tests.
 open circuit and short circuit tests.
 zero power factor and slip tests.

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Electrical Machines
If the excitation of the synchronous generator fails, it acts as a/an

 synchronous motor.
  induction generator.
 synchronous generator.
 induction motor.

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