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Electrical Machines

Electrical Machines
The current drawn by a 220 V DC series motor of armature resistance 0.5 Ω and back emf of 200 V is

 440 A.
 400 A.
 40 A.
 44 A.

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Electrical Machines
The demagnetising component of armature reaction in a DC generator

  reduces generator emf.
  reduces inter poles flux density.
  increases armature speed.
  results in sparking trouble.

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Electrical Machines
What is the frequency of a alternator, if P = number of poles and N = revolution made per second?

 120N / P Hz.
  PN / 2 Hz.
 120 / PN Hz.
 120P / N Hz.

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Electrical Machines
From no load to full load the slip will

 slightly decrease.
None of these
 not change.
 slightly increase.

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Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 differential compound.
 shunt.
 series.
 cumulative compound.

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Electrical Machines
In induction motor the 7th harmonic torque may make the motor rotate at (1 / 7)th synchronous speed. This is called

  cogging.
  crawling.
  harmonics.
  resonance.

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