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Electrical Machines

Electrical Machines
A 100/10, 50 VA double winding transformer is converted to 100/110 V auto transformer. The rating of auto transformer is

 550 VA
 100 VA
 110 VA
 500 VA

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Electrical Machines
A DC generator beyond critical resistance will generate

 no voltage.
 maximum voltage.
 maximum power.
 maximum current.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using transformer oil of better quality.
 using the magnetic core of low reluctance.
 using soft material for winding.
 increasing the number of turns.

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Electrical Machines
If the air gap of IM is increased, ____________ will increase.

  power factor.
  speed.
  magnetizing current.
  air gap flux.

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Electrical Machines
A DC motor with armature resistance of 0.5 ohms connected directly to a 220 Volt supply. If the armature is stationary then the current flowing through the armature is

 250 A.
 340 A.
 570 A.
 440 A.

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Electrical Machines
A 440 V, 3-phase, 10 pole and 50 HZ synchronous motor delivering a torque of 50 N-m, delivers a power of

 1000W
 100W
 3000W
 500W

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MORE MCQ ON Electrical Machines

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