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Electrical Machines

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

 15 HP.
  10 HP.
 14 HP.
  13 HP.

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Electrical Machines
Flux density under trailing pole tips in case of generator will

 decrease
 increase
None of these
 either increase or decrease

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Electrical Machines
Generator works on the principle of production

 both A and B.
 static induced emf.
None of these
 dynamically induced emf.

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Electrical Machines
The principle of dynamically induced emf is utilized in

 choke.
 thermocouple.
 generator.
 transformer.

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Electrical Machines
A 200 V DC machine supplies 20 A at 200 V as a generator. The armature resistance is 0.2 Ω. If the machine is now operated as a motor at same terminal voltage and current but with the flux increased by 10%, the ratio of motor speed to generator speed is

 1.06
 0.95
 0.96
 0.87

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Electrical Machines
Breather is provided in a transformer to

 provide cold air in transformer.
  absorb moisture of air during breathing.
 filter the transformer oil.
 absorb moisture from air entering in transformer.

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