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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 2HZ
 1 Hz
 2.5Hz
 50Hz

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Electrical Machines
The armature resistance of the dc motor is generally of the range

  0.5 ohm.
 100 ohm.
 50 ohm.
  0.1 ohm.

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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

  2 KW.
 10 KW.
 0.
 8 KW.

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Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.
  cheaper in cost.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 50 V.
  230.2 V.
 399 V.
 100 V.

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

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