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Electrical Machines

Electrical Machines
A 20KVA auto transformer, turn ratio is 0.8. Find the power transferred conductively?

 4KVA
 0KVA
 16KVA
 20KVA

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Electrical Machines
It is an advisable to use auto transformer if the transformation ratio is

 near to 1.
 0.5.
 0.25.
 Greater than 1.

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Electrical Machines
Example of double excited machine is

 DC Shunt Motor
None of these
 Synchronous motor.
 Both are correct.

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Electrical Machines
A 3-phase, 50 Hz, 4 pole induction motor is running at 1440 rpm. Find the rotor efficiency?

 95%
 96%
 92%
 94%

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Electrical Machines
The oscillation in a synchronous motor can be damped out by

  providing damper bars in the rotor pole faces.
  maintaining constant excitation.
  running the motor on leading power factors.
  oscillation cannot be damped.

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Electrical Machines
A differentially compound motor under high-over-load conditions will behave like a / an

  series motor.
 AC synchronous motor.
 cummulative compound motor.
 shunt motor.

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