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Electrical Machines

Electrical Machines
Reactive power generated or delivered significantly depends on

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

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Electrical Machines
In star-delta starting of squirrel cage induction motor compared to DOL starting the starting current and torque are

 1/√3, 1/√3
 1/3, 1/√3
 1/√3, 1/3
 1/3, 1/3

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of commutator segments.
  number of pole pairs.
  number of parallel paths.
  number of poles.

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Electrical Machines
A 230 V dc series generator is driven at its rated speed. The no-load voltage across its armature terminals would be

 6 V
 somewhat more than 230 V
 230 V
 somewhat less than 230 V

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Electrical Machines
A dc shunt motor runs at a no-load speed of 1140 rpm. At full load, armature reaction weakens the main flux by 5% whereas the armature circuit voltage drops by 10%. The motor full-load speed in rpm is

 1080
 1200
 1000
 1203

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 high starting torque.
  zero starting torque.
 starting torque equal to full-load torque.

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MORE MCQ ON Electrical Machines

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