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Electrical Machines

Electrical Machines
The speed regulation of a DC motor is given as

 NnL − NfL.
 (NfL − NnL)/NnL.
 NnL/NfL.
 (NnL − NfL)/NfL.

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Electrical Machines
The maximum possible speed at which an alternator can be driven to generate 50 Hz and 4000 V is

  1500 rpm.
  3600 rpm.
  4000 rpm.
  3000 rpm.

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Electrical Machines
When Flemings right hand rule to find the direction of induced emf, the thumb points towards

 opposite to the direction of motion of the conductor.
 direction of flux.
 direction of motion of the conductor.
 direction of induced emf.

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Electrical Machines
Hunting in a synchronous cannot be due to

  variable supply voltage.
  variable load.
  variable frequency.
  windage friction.

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Electrical Machines
A synchronous generator is feeding a zero power factor (lagging) load at rated current. The armature reaction is

 cross – magnetizing.
 ineffective.
 magnetizing.
  demagnetizing.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  none of above.
 demagnetising.
  crossmagnetising.
  magnetising.

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MORE MCQ ON Electrical Machines

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