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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. What is the slip value?

 0.2
 0.4
 0.04
 0.02

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Electrical Machines
Demagnetization effects which of the following?

 reduces the terminal voltage
 commutation
 both B and C
 reduction in main field flux

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Electrical Machines
The material used for commutator brushes is mostly

 mica.
 cast iron.
  carbon.
 copper.

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Electrical Machines
Which of the following rotor requires damper winding?

 Salient pole rotor.
None of these
 Cylindrical rotor.
 Both type rotor.

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  level compound.
  short - shunt generator.
 series generator.
  shunt generator.

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Electrical Machines
In double cage induction motor, the inner cage offers

  high resistance and low reactance.
  low resistance and low reactance.
  high resistance and high reactance.
  low resistance and high reactance.

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