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Electrical Machines

Electrical Machines
If the field current is reduced to zero the maximum power developed by alternator is

 0.9103 KW.
 5.46 KW.
 1.644 KW.
  2.73 KW.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 using transformer oil of better quality.
 using soft material for winding.
 increasing the number of turns.

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Electrical Machines
The voltmeter connected across a generator reads voltage same at no load and at full load (rated). The generator is of the type

  level compound.
  short - shunt generator.
  shunt generator.
 series generator.

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Electrical Machines
Transformer cooling and insulating oil must be of

  low viscosity.
 high viscosity.
 low resistivity.
 low BDV.

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 8
 2
 4

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Electrical Machines
DC generators are usually designed to develop armature voltages not exceeding 650 V because of the limitations imposed by

 armature winding
 commutator
 starters
 field winding

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