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Electrical Machines

Electrical Machines
In a 6 pole DC machine, 90 mechanical degrees correspond to which of the following electrical degree?

 30.
 45.
 180.
  270.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

  PN / 2 Hz.
 120P / N Hz.
 120N / P Hz.
 120 / PN Hz.

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Electrical Machines
Reactive power generated or delivered significantly depends on

 load angle.
 both 1 and 2.
 excitation.
 frequency.

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Electrical Machines
Maximum power developed depends on

 reactance
 voltage
 load angle
 both 1and 2

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Electrical Machines
For small value armature current Ia the torque developed by a DC series motor is proportional to

  1/Ia.
  Ia2.
  Ia.
  √Ia.

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

 1 Hz
 2.5Hz
 50Hz
 2HZ

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