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Electrical Machines

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

 100W
 500W
 1000W
 3000W

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Electrical Machines
A 220 V DC machine has an armature resistance 1 Ω. If the full load current is 20 A, the difference of induced voltage between generator and motor is

 20 V.
 40 V.
 60 V.
 0 V.

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Electrical Machines
What is/are the advantages of parallel operation of alternators?

 Increase efficiency under light load conditions
All of these
 Increase in reliability
 continuity supply is maintained

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Electrical Machines
In most condition which frame of motor will be preferred?

  Totally enclosed fan coiled.
 Open type.
 Splash proof.
 Drip proof.

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Electrical Machines
A 4 pole DC generator runs at 750 rpm and generate an emf of 240 V. The armature is wave wound and has 792 conductors. If the total flux from each pole is 0.0145 Wb. What is the leakage co-efficient?

  1.2.
 1.4.
 1.5.
 1.8.

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Electrical Machines
3rd harmonics are eliminated in induction motor by using

  delta connection.
  star connection.
  zig - zag connection.
  V connection.

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