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Electrical Machines

Electrical Machines
The slip of an induction motor during DC rheostatic braking is

  2 - s.
  s.
 1 - s.
 2 + s.

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Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

  2.73 KW.
 0.9103 KW.
 5.46 KW.
 1.644 KW.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 thermocouple.
 generator.
 choke.
 transformer.

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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

 3000W
 100W
 1000W
 500W

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Electrical Machines
We can apply source transformation to voltage source when a resistance is connected to it in

 15 HP.
 14 HP.
  10 HP.
  13 HP.

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Electrical Machines
To control the speed of an induction motor, the supply frequency is reduced by 10%. For the same magnetizing current to remain constant, the supply voltage must be

 increased by 10%
 increased by 20%
 reduced by 10%
 reduced by 20%

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