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Electrical Machines

Electrical Machines
In alternator, the rotary part is

  magnetic field poles.
 none of these.
 armature.
 core.

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Electrical Machines
Stray losses in transformer occurs in

 paper insulation in transformers.
 transformer insulating oil.
 steel core.
  winding conductors and steel structures of transformer.

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Electrical Machines
Poles of DC machine are often laminated to

 dissipate more heat.
 reduce armature reaction.
 reduce pulsation loss.
 reduce iron weight.

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Electrical Machines
In DC machines shape of net flux density is?

 saddle shape
 sine wave
 flat tapped or trapezoidal
 peaky in nature

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Electrical Machines
Which motor cannot be started on no load?

 shunt motors
 both B and C
 cumulative compound motors
 series motors

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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?

 30 V.
 90 V.
 60 V.
 40 V.

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