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Electrical Machines

Electrical Machines
On what factors the speed of dc motor depends?

 All of these.
 Armature current Ia.
 Applied voltage.
 Field flux.

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

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Electrical Machines
Which motor used in Lathe machine?

  D.C. shunt motor.
  D.C. cumulative compound motor.
None of these
  D.C . series motor.

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Electrical Machines
Transformer action requires a

 increasing magnetic flux.
 constant magnetic flux.
 alternating magnetic lux.
 alternating electric flux.

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Electrical Machines
The speed of rotation of 5th harmonic component in the stator of an induction motor is

  (1 / 5) times the synchronous speed.
 (1 / 15) times the synchronous speed.
 5 times the synchronous speed.
  0.5 times the synchronous speed.

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Electrical Machines
Armature reaction depends on which of the following?

 power factor of load
None of these
 magnitude of load current
 both 1 and 2

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MORE MCQ ON Electrical Machines

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