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Electrical Machines

Electrical Machines
Which of the following DC generators has rising V-I characteristics?

  Shunt.
  Series.
  Compound.
  None of them.

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  rotor can not have any laminations.
  thicker.
  sipper.
  thinner.

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Electrical Machines
Alternator operates on the principle of

  mutual induction.
  self or mutual induction.
  electromagnetic induction.
  self induction.

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Electrical Machines
If residual magnetism of a shunt generator is destroyed accidentally it may be restored by connecting its shunt field

 to earth.
 to an AC source.
 in reverse.
  to a DC source.

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Electrical Machines
In an induction motor, the no-load slip is generally equal to

  zero.
  less than 1 %.
 1.5 %.
 4 %.

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Electrical Machines
The constant losses in transformer is/are

 hysteresis loss.
 both 2 and 3.
 copper loss.
 eddy current loss.

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