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Electrical Machines

Electrical Machines
A 4 pole 50 Hz induction motor is running at 1470 rpm. Find the speed of stator magnetic field with respect to rotor?

 1500 rpm
 30 rpm
 zero
 1470 rpm

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Electrical Machines
In a dc machine 4 pole lap winding is used. The number of parallel paths are?

 1
 4
 8
 2

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Electrical Machines
A single-winding single-phase motor has

 low starting torque.
 starting torque equal to full-load torque.
  zero starting torque.
 high starting torque.

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Electrical Machines
A 4-pole DC generator runs at 1500 rpm. The frequency of current in the armature winding is:

 100 Hz.
 Zero Hz.
 25 Hz.
 50 Hz.

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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

  harmonics.
  resonance.
  crawling.
  cogging.

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Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 none of these.
  Shunt.
 Compound (cummolative).
 Series.

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MORE MCQ ON Electrical Machines

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