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Electrical Machines

Electrical Machines
Maximum power developed depends on

 both 1and 2
 reactance
 load angle
 voltage

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Electrical Machines
Which of the following represents the operating region of slip in a 1-phase induction motor?

 -2 < S < 2
 0 < S < 2
 0 < S < 1
 -1 < S < 1

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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?

 40 V.
 90 V.
 30 V.
 60 V.

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Electrical Machines
The heat generated in the transformer is dissipated mainly by

All of these
  convection.
 conduction.
 radiation.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  increases armature speed.
  results in sparking trouble.
  reduces inter poles flux density.
  reduces generator emf.

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Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
 Shunt.
  Separately excited.
  Compound.

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