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Electrical Machines

Electrical Machines
The rotor power output of 3-phase induction motor is 15 KW. The rotor copper losses at a slip of 4% will be

 600 W
 625 W
 700 W
 650 W

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Electrical Machines
Which of the following methods of speed control is not affected through stator side?

  Change of supply voltage.
  Change of rotor resistance.
  Change of number of pole.
  Change of supply frequency.

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Electrical Machines
Which of the following is the largest conversion device?

 DC machine
 Synchronous machine
All of these
 Induction machine

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
 radiation.
 conduction.
  convection.

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Electrical Machines
Which of the following is/are the advantages of carbon brush over the copper brush?

 They are not hard as copper brush
 They are self lubricating in nature
 In case of any sparking they will be less damaged than copper brushes
All of these

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Electrical Machines
Cross magnetization effects which of the following?

 reduction in main field flux
 reduces the terminal voltage
 commutation
 both 2 and 3

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