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Electrical Machines

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

  Series.
  None of them.
  Shunt.
  Compound.

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Electrical Machines
The direction of rotation of a DC compound motor can be reversed by interchanging

 series field connections.
 armature or field connections.
 shunt field connections.
 armature connections.

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Electrical Machines
A commutator in dc machine provide ----------------- rectification?

 half wave
 full wave
 half wave controlled
 full wave controlled

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Electrical Machines
Type of single phase motor having highest power factor at full load is

  shaded pole type.
  capacitor start.
  split phase.
  capacitor run.

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Electrical Machines
The field system of an alternator is usually excited

  3 - Φ, 50 Hz and 400 V.
  110 / 220 V AC.
  230 V AC.
  250 / 250 V DC.

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Electrical Machines
Number of slip rings in 3-phase synchronous motor will be

 3 or 4
 0
 2
 1

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