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Electrical Machines

Electrical Machines
Total core loss is also called as -------------?

 Hysteresis loss
 Magnetic loss
 Copper loss
 Eddy current loss

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

  demagnetizing.
 magnetizing.
 cross – magnetizing.
 ineffective.

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Electrical Machines
R1 is the resistance of the primary winding of the transformer. The turn ratio in terms of primary to secondary is K. Then the equivalent resistance of the primary referred to secondary is

 R1 /K
 K²R1
 R1 /K²
 K×R1

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Electrical Machines
If the applied voltage of a DC motor is 230 V, then back emf, for maximum power developed is

 115 V.
 460 V.
 200 V.
 230 V.

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Electrical Machines
Slip test is performed to determine

 positive sequence reactance and negative sequence reactance
All of these
 slip
 direct axis reactance and quadrature axis reactance

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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

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

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MORE MCQ ON Electrical Machines

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