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Electrical Machines

Electrical Machines
In DC generator, which component plays the vital role to produce the direct current?

 Brush.
 Yoke.
  Commutator.
 Armature.

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

  Ia2.
  Ia.
  1/Ia.
  √Ia.

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Electrical Machines
For a 3 - Φ, 4 pole, 50 Hz IM rotating at full load speed of 1440 rpm, calculate speed of rotor field with respect to rotor structure and stator structure respectively?

  60, 1500.
 1440, 1500.
 50, 1500.
 60, 1440.

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Electrical Machines
A 3 phase stepper motor has 6 stator poles and 4 rotor poles, then find the step angle?

 30°
 10°
 45°
 60°

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Electrical Machines
What will be the maximum power factor of an induction motor for dispersion coefficient of 0.05?

 20.
  0.905.
  0.05.
 1.1.

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Electrical Machines
Which of the following is/are not a self starting motor?

 3-phase induction motor
 1-phase induction motor
None of these
 both 1 and 2

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MORE MCQ ON Electrical Machines

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