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Electrical Machines

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

 96%
 95%
 92%
 94%

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Electrical Machines
Which of these types of motor is self starting?

  Poly-phase induction motor.
  Poly-phase synchronous machine.
  Single phase induction motor.
  None of these.

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Electrical Machines
Ward-Leonard control is basically a ___________ control method.

 Field control.
 Field diverter control.
 Armature voltage control.
 Armature resistance control.

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Electrical Machines
In above question, find rms line voltage for delta connection?

 399 V.
 50 V.
 100 V.
  230.2 V.

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Electrical Machines
Maximum power developed in a cylindrical synchronous machine depends on

 load angle
 both 1and 2
 synchronous reactance
 excitation

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Electrical Machines
Transformer core is laminated to reduce

 both 1 and 2.
 hysteresis loss.
 copper loss.
 eddy current loss.

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