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Electrical Machines

Electrical Machines
In DC motors, under trailing pole tips, flux density will_______ ?

None of these
 decrease
 increase
 either increase or decrease

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Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  greater than one.
  approx to one.
  less than one.
  very low

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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
Generators work on the principle of production of

 dynamically induced emf.
None of these
 statically induced emf.
 dynamically and statically induced emf.

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Electrical Machines
In a DC generator in case the brushes are moved so as to bring them in magnetic neutral axis, then, there will be

 demagnetisation.
  none of above.
  cross-magnetisation.
  cross-magnetization as well as demagnetization.

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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.
 60 V.
 40 V.

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