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Electrical Machines

Electrical Machines
The current drawn by a DC motor at the time of starting is

 Very high.
 Zero.
 Very low.
 Normal.

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Electrical Machines
Commutators in DC machines have a role of which converts

 Both AC to DC and DC to AC.
 high voltage DC to low voltage DC.
 none of these.
 AC to DC.

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Electrical Machines
Which of the following motor is not suitable for frequent starting and stopping?

 Resistance split phase motor
 Capacitor split phase motor
 Capacitor run motor
All of these

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Electrical Machines
Armature flux is.............with respect to main field flux or main field poles?

 rotates opposite direction
 rotates same direction
 stationary
None of these

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Electrical Machines
In a synchronous machine, if the field flux axis is ahead of the armature field axis in the direction of rotation, the machine operating is

  synchronous generator.
  synchronous motor.
  asynchronous motor.
  asynchronous generator.

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Electrical Machines
Transformer action requires a

 constant magnetic flux.
 alternating magnetic lux.
 alternating electric flux.
 increasing magnetic flux.

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MORE MCQ ON Electrical Machines

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