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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

 frequency.
 excitation.
 load angle.
 both 1 and 2.

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Electrical Machines
Methods of synchronizing of alternator may be done by

 all dark lamp method.
  all of these.
 all bright lamp method.
 one dark two bright.

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Electrical Machines
In shapers and slotters which motor are preferred?

  Synchronous motor.
  Slip ring IM.
  Squirrel cage IM.
  Double cage motor.

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Electrical Machines
Which type of motors are used for lathes?

 Synchronous motor.
 DC shunt motors.
 Either A or B.
 Cage induction motor.

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Electrical Machines
The overall power factor of an on load transformer

 is always leading.
  depends on the power factor of the load.
 is always lagging.
 is always unity.

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Electrical Machines
The slight curvature at the lower end of the OCC of a self excited DC generator is due to

  high speed.
  high field resistance.
  magnetic inertia.
  residual flux.

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