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Electrical Machines

Electrical Machines
If the applied voltage to a dc machine is 230 V, then the back emf, for maximum power developed, is

 115 V
 230 V
 460 V
 200 V

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Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1820W
 1450W

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Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  phosphor bronze.
  stainless steel.
  carbon.

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Electrical Machines
A smaller air gap in a polyphase induction motor helps to

  reduce the chance of crawling.
  reduce the magnetizing current.
  reduce the chance of cogging.
  increase the starting torque.

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Electrical Machines
For high current and low voltage rating which winding is employed to DC machine?

 Wave winding.
 No wave and lap winding.
 Both wave and lap winding.
 Lap winding.

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Electrical Machines
When the armature current of 5 Amp is flowing through the dc motor the torque produced is 47 Nm. Keeping the speed constant if the armature current is increased to 7 amp, calculate the new torque. Assume losses to be constant.

 74 Nm.
 27.73 Nm .
  65.8 Nm.
 38.5 Nm.

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