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Electrical Machines

Electrical Machines
What is the frequency of rotor current of 50 Hz induction motor operating at 4% slip?

 50Hz
 1 Hz
 2.5Hz
 2HZ

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Electrical Machines
Find the synchronous reactance of alternators in which a given field current of 200 A on short circuit and a generated emf of 50 V on open circuit. Armature resistance is 0.1 ohm

 0.5Ω.
 1Ω.
 0.25Ω.
  0.23Ω.

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Electrical Machines
Oil is provided in an oil filled transformer for

 lubrication.
  insulating.
  both cooling and insulation.
 cooling.

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Electrical Machines
The voltage regulation of a DC generator at full load being zero implies that the generator is

  deferentially compounded.
  series connected.
 shunt connected.
  cumulatively compounded.

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Electrical Machines
Diverters are used only in

 shunt motors
 either of these
None of these
 series motors

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Electrical Machines
Fifth harmonic component of the induced voltage in three phase AC generator can be eliminated by using a winding pitch of

  4 / 5.
 2 / 3.
 5 / 6.
 6 / 7.

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