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Electrical Machines

Electrical Machines
A 4-pole dc generator runs at 1500 rpm. The frequencyof current in the armature winding is

 100 Hz
 25 Hz
 50 Hz
 0 Hz

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Electrical Machines
The short circuit test on a transformer is conducted to obtain

 core loses only.
 hysteresis loss.
  copper losses.
 eddy current loss.

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Electrical Machines
In a 3 - Φ IM in order to eliminate cogging the number of stator slots must be

  unequal to number of rotor slots and skewed in shape.
  either (B) or (C).
  an integral multiple of number of rotor slots.
  equal to number of rotor slots.

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Electrical Machines
Which type motors are preferred for lathes?

 DC shunt motors.
 Synchronous motor.
 Squirrel Cage induction motor.
 Either A or B.

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Electrical Machines
The main purpose of providing tertiary winding in a three phase transformer is

None of these
 to interconnect three voltage systems.
 to carry extra load.
  to suppress harmonic and unbalance in voltage.

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

 1
 2
 4
 8

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MORE MCQ ON Electrical Machines

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