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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. The frequency of rotor current is

 50 Hz
 5 Hz
 1 Hz
 0 Hz

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Electrical Machines
Swinburne's test is applicable to

 DC shunt and level Compound motor.
 DC compound motor.
 DC series motor.
 DC Shunt motor.

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Electrical Machines
DC machine windings are

None of these
 either of these
 short pitched
 full pitched

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Electrical Machines
If s is the slip and f is the supply frequency of an induction motor, the frequency of rotor current is given by

  sf / 2.
  f / s.
  sf.
  s2.

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Electrical Machines
A 3 - Φ, 6 pole, 50 Hz IM has a rotor speed of 987 rpm find rotor frequency?

 0.70 Hz.
  60 Hz.
 0.75 Hz.
  0.65 Hz.

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 greater than
 equal to
 any of the above
 less than

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MORE MCQ ON Electrical Machines

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