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Electrical Machines

Electrical Machines
In which transformer, the tertiary winding is used?

 Star - star
 Delta - delta
 Star - delta
 Delta - star

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Electrical Machines
Number of tappings for each equalizer ring is equal to

  number of pole pairs.
  number of poles.
  number of commutator segments.
  number of parallel paths.

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Electrical Machines
The power flow of a dc motor, with respect to a DC generator is

  increased.
  reversed.
  modified.
  none of these.

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Electrical Machines
Maximum power developed depends on

 voltage
 both 1and 2
 load angle
 reactance

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Electrical Machines
The air gap between stator and the rotor of the 3 - φ induction motor is kept

  depends on the material of stator and the rotor.
  air gap does not matter.
  as small as possible.
  as wide as possible.

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Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 increase to rated voltage and then may decrease
 remain nearly constant
 decrease
 increase gradually and then stay at rated voltage

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