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Electrical Machines

Electrical Machines
Commonly used starters of cage motor is

  both A and B.
  star delta.
None of these
  DOL.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  deferentially compounded.
 shunt connected.
  cumulatively compounded.
  series connected.

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Electrical Machines
In DC machine yoke offers

 produce working flux
 flux path completion
 both A and B
 mechanical protection to the machine

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Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
 electro graphite → large ratings
 carbon brush → normal ratings
All of these

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Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 either of these.
None of these
 decrease.
 increase.

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Electrical Machines
Stray losses in transformer occurs in

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

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