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Electrical Machines

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

 remains constant.
 decreases
 increases.
 decreases.

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Electrical Machines
Armature reaction of an unsaturated DC machine is

  crossmagnetising.
  none of above.
  magnetising.
 demagnetising.

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Electrical Machines
An induction motor when started on no load does not accelerate up to full speed but runs at 1/7th of the rated speed. The motor is said to be

 crawling.
 cogging.
 plugging.
 locking.

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Electrical Machines
If any two leads from slip rings are interchanged in a 3 - Φ induction motor, the motor will

  not run.
  get damaged.
  continue running in the same direction as before.
  run in a direction opposite to previous one.

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Electrical Machines
In above question, find rms line voltage for delta connection?

  230.2 V.
 399 V.
 100 V.
 50 V.

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Electrical Machines
Field divertor method of speed control of a DC series motor gives speed above rated one due to reduction of

 None of above.
 Field current.
 Line current.
 Armature current.

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