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Electrical Machines

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

  Compound.
  None of them.
  Shunt.
  Series.

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Electrical Machines
In DC generator, armature reaction refers to what?

 Effect of armature flux on the load.
  Effect of armature flux on the main field flux.
 Effect of field flux on the armature flux.
None of these

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Electrical Machines
Maximum efficiency will occur, when copper loss is_______to iron loss?

 equal to
 greater than
 less than
 any of the above

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Electrical Machines
Induction motors have the advantage of

  less cost.
  simple in construction.
  all of below.
  less maintenance.

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Electrical Machines
Motors for fans and pumps are selected in the rpm range

  375 to 500.
  1440 to 2880.
  720 to 920.
  500 to 720.

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Electrical Machines
Which method is less recommendable for induction motor starting in the industries?

  Rotor resistance starting.
  Auto transformer starting.
  Stator resistance starting.
  Direct online starting.

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