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Electrical Machines

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

  Commutator.
 Brush.
 Armature.
 Yoke.

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Electrical Machines
In most condition which frame of motor will be preferred?

 Splash proof.
 Open type.
  Totally enclosed fan coiled.
 Drip proof.

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Electrical Machines
The working principle of transformer depends on

 Newtons law.
 Coulombs law.
 Faradays law of electromagnetic induction.
 Amperes law.

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Electrical Machines
The rotor of a 3 - Φ wound induction motor is provided with

  heavy short-circuited end rings.
  heavy copper or aluminium bars placed in rotor slots.
  three phase winding.
  single phase winding.

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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?

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

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Electrical Machines
If the source voltage of a DC motor is increased, which of the following will decrease?

  Full load current.
 Starting torque.
 Starting torque, operating speed, full load current.
 Operating speed.

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MORE MCQ ON Electrical Machines

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