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Electrical Machines

Electrical Machines
In DC machine torque is proportional to which of the following?

 flux(φ)
 armature current(Ia)
None of these
 both A and B

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using soft material for winding.
 using the magnetic core of low reluctance.
 increasing the number of turns.

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Electrical Machines
A DC series motor has which of the following characteristics?

 Has a almost constant speed.
 Has its field winding consinting of thick wire and less no of turns.
 Can be started easily without load.
 Has a poor torque.

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Electrical Machines
A 3 - Φ, 4 pole, 50 Hz induction motor 4 % slip, calculate frequency of the rotor emf?

 50 Hz.
 10 Hz.
  3 Hz.
  2 Hz.

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Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Series motor.
  Shunt motor.
  Cumulative compound motor.
  Differential compound motor.

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Electrical Machines
In a 3 - φ induction motor running at full load which of these parameters is stationary with respect to the stator mmf wave?

  Stator winding.
  Rotor mmf wave.
  Rotor winding.
  Both rotor and stator winding.

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MORE MCQ ON Electrical Machines

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