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Electrical Machines

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

 Armature.
 Yoke.
 Brush.
  Commutator.

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Electrical Machines
Which of the following is not a necessary condition to be satisfied for synchronising an incoming alternator to an already operating alternator?

 same prime mover speed
 same voltage magnitude
 same frequency
 same phase sequence

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 1.644 KW.
  2.73 KW.
 0.9103 KW.
 5.46 KW.

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Electrical Machines
The commutator segments of DC machines are made up of

 brass
 copper alloy
 copper
 hard-drawn copper

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Electrical Machines
High starting torque and low starting current is the advantage of

  hysteresis motor.
  stepper motor.
  squirrel cage induction motor.
  slip ring induction motor.

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Electrical Machines
In case of DC Shunt Motor, the speed will____ if the voltage increases, neglecting armature saturation.

 be unpredictable.
 increase
 remain the same.
 decrease.

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