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ELECTRICAL MACHINES

Electrical Machines
Armature reaction in DC generators will result in

 short circuit.
 reduction in generated emf.
 open circuit.
 increase in slip.

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Electrical Machines
A lap wound DC machine has 400 conductors and 8 poles. The voltage induced per conductor is 2 volts. The machine generates a voltage of

 100 V.
 800 V.
 200 V.
 400 V.

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Electrical Machines
Which machine is used for battery charging?

 DC shunt generator.
 Compounded DC generator.
 DC series generator.
 None of these.

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Electrical Machines
A series generator is connected in series to a feeder having 0.5Ω resistance to boost the voltage. The induced voltage is given by Eg = 0.6Ia, Ra = 0.2Ω and Rs = 0.3Ω. Find the voltage boosted by the generator, when delivering 400 Amp?

 90 V.
 30 V.
 40 V.
 60 V.

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Electrical Machines
When an electric train is moving down a hill, the DC motor will operate as

 DC shunt generator.
 DC shunt motor.
  DC series generator.
  DC series motor.

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