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Electrical Machines

Electrical Machines
Motors for fans and pumps are selected in the rpm range

  1440 to 2880.
  720 to 920.
  375 to 500.
  500 to 720.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 both 1and 2
 synchronous reactance
 excitation
 load angle

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Electrical Machines
In circle diagram for induction motor, diameter of circle represents which of the following ?

 Line voltage.
 Rotor current.
 Running torque.
 Slip.

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

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

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Electrical Machines
Oil is provided in an oil filled transformer for

  both cooling and insulation.
 cooling.
  insulating.
 lubrication.

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = θmech
 θelec = P/2*θmech
 θelec = 2/P*θmech
 θelec = 4/P*θmech

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MORE MCQ ON Electrical Machines

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