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Electrical Machines

Electrical Machines
In dc machines, the space distribution of air-gap flux density wave at no load is

 rectangular
 flat-topped
 co- sinusoidal
 sinusoidal

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Electrical Machines
The synchronous speed of an induction motor will be increased by

  decreasing of frequency.
  increasing number of poles.
  speed can not be increased.
  increasing of frequency.

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Electrical Machines
The rotor winding for a 3-phase slip-ring induction motor having delta-connected stator must be connected in

  delta or star according to need.
None of these
  delta.
  star.

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Electrical Machines
Diverters are used only in

None of these
 series motors
 shunt motors
 either of these

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Electrical Machines
The 3 - Φ induction motor with rotor circuit open will

  not run.
  run normally.
  get over heated.
  make noise.

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Electrical Machines
1 KVA, 230 V, 50 Hz, single phase transformer has an eddy current loss of 30 watts. The eddy current loss when the transformer is excited by a dc source of same voltage will be

 30 W
 more than 30 W
 less than 30 W
 zero watt

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MORE MCQ ON Electrical Machines

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