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Electrical Machines

Electrical Machines
The current drawn by the a 230 V DC motor of armature resistance 0.5 Ω and back emf 200 V is

 60
 660
 40
 600

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Electrical Machines
An unexcited single phase synchronous motor is

  universal motor.
 reluctance motor.
 repulsion motor.
 AC series motor.

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Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 improve starting torque
 decrease starting torque
 increase pull out torque
 reduce magnetising current and improve power factor

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Electrical Machines
The maximum power developed in cylindrical synchronous machine is occurs at a load angle of

 less than 90o.
 Greater than 90o.
 0o.
 90o.

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/3, 1/√3
 1/√3, 1/3
 1/3, 1/3
 1/√3, 1/√3

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Electrical Machines
A 220 V DC machine has an armature resistance 1Ω. If the full load current is 20 A, the difference of induced voltage and generator is

 60 V.
 20 V.
 0 V.
  40 V.

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MORE MCQ ON Electrical Machines

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