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Electrical Machines

Electrical Machines
Slip rings of an induction motors are made of

  aluminium.
  phosphor bronze.
  stainless steel.
  carbon.

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Electrical Machines
A 230 volt dc motor has an armature winding resistance of 0.5 ohm. Calculate the emf induced by the motor if the full load armature current is 23 ampere.

  None of these.
 220.4 volt.
  120 volt.
  218.5 volt.

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Electrical Machines
Which of the following machine is invariably provided with forced ventilation?

 Fractional horse power slow speed motor.
 50 MW generator in a power plant.
  Hermetically sealed motor of refrigerator.
 Fractional horse power high speed motor.

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

 Running torque.
 Slip.
 Line voltage.
 Rotor current.

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Electrical Machines
What is the full form of MNP?

  Magnetic field neutral pole.
  Magnetic field neutral plane.
  Magnetic neutral plane.
  Magnetic neutral pole.

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Electrical Machines
Eddy current loss will depends on

 Flux density
All of these
 Frequency
 Thickness

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