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Electrical Machines

Electrical Machines
The output power of any electrical motor is taken from the

 Armature.
 Field.
 Motor frame.
 Coupling mounted on the shaft.

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Electrical Machines
In a DC Shunt Motor if the load current increases then field flux

 decreases.
 increases.
 remains constant.
 decreases

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Electrical Machines
For a transformer to be tested at full load conditions but consuming only losses from the main, we do

 load test
None of these
 OC and SC tests
 back to back test

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Electrical Machines
Hunting in a synchronous motor takes place

  motor is under loaded.
  when power factor is unity.
  when supply voltage fluctuates.
  when load varies.

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Electrical Machines
The polarity of a DC generator can be reversed by

 increasing field current.
 reversing field electric current as well as direction of rotation.
 reversing the field current.
 any of above.

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Electrical Machines
In a transformer the magnetic coupling between the primary and secondary winding can be increased by

 using the magnetic core of low reluctance.
 increasing the number of turns.
 using soft material for winding.
 using transformer oil of better quality.

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