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Electrical Machines

Electrical Machines
A 3-phase, 50Hz, 4 pole induction motor is running at 1440 rpm and rotor input power is 2KW. Find the rotor output power?

 1920W
 2000W
 1450W
 1820W

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Electrical Machines
In a synchronous motor electromagnetic power varies

 directly as applied voltage
 inversely as applied voltage
None of these
 directly as square of applied voltage

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Electrical Machines
Skewing of cage rotors offers the following advantages

  less noise.
  all of below.
  locking tendency is reduced.
  uniform torque.

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Electrical Machines
A transformer core is made up of a silicon steel laminations which has maximum flux density 1 Tesla. If it was cold rolled grain oriented its flux density increases to 1.6 Tesla. What is the saving in core size or area due to cold rolled grain oriented process?

 38%
 40%
 68%
 60%

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Electrical Machines
No load test on induction motor is conducted to find which of the following losses?

 Stator copper loss
 Rotational loss
All of these
 Stator core loss

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Electrical Machines
What is/are the necessary conditions for parallel operation of alternators?

 Terminal voltage is same
 Speed of alternators should be same
 Both 1and 2
 Frequency should be same

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