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Electrical Machines

Electrical Machines
A 220 V DC generator is run at full speed without any excitation. The open circuit voltage will be

  about 2 V.
  zero.
  about 50 V.
  220 V.

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Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 proportionate to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
 inversely proportional to MVA rating of transformers.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  continue running in the same direction as before.
  run in a direction opposite to previous one.
  get damaged.
  not run.

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Electrical Machines
A 3 - φ induction motor can also be referred to as a

  shunt motor.
  repulsion motor.
  asynchronous motor.
  transformer.

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Electrical Machines
Eb/Vt ratio of a DC motor is an indication of

 efficiency.
 speed regulation.
 starting torque.
 running torque.

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Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 10 KW.
 0.
 8 KW.
  2 KW.

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