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Electrical Machines

Electrical Machines
Iron losses in a DC machine are independent of variation in

  voltage.
  speed and voltage.
  load.
 speed.

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Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Either A or B.
 Squirrel Cage induction motor.
 Synchronous motor.

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Electrical Machines
A transformer has hysteresis loss of 30 W, at 240 V, 60 Hz. The hysteresis loss at 200 V, 50 Hz will be

 25 W.
 36 W.
 28 W.
 30 W.

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Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  zero.
  about 50 V.
  about 2 V.
  220 V.

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Electrical Machines
Value of specific electric loading of Induction motor is in the range of

 30000 - 100000 ampere conductor / metre.
  5000 - 45000 ampere conductor / metre.
 40 - 400 ampere conductor / metre.
  400 - 4000 ampere conductor / metre.

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Electrical Machines
A slip ring Induction motor runs at 290 rpm at full load, when connected to 50 Hz supply. Determine the number of poles and slip.

  P = 20, s = 3.33 %.
  P = 40, s = 5.79 %.
  P = 60, s = 0.96 %.
  P = 50, s = 4.43 %.

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