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Electrical Machines

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

 decreases
 remains constant.
 increases.
 decreases.

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Electrical Machines
Which motor cannot be started on no load?

 cumulative compound motors
 both B and C
 shunt motors
 series motors

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Electrical Machines
Eddy current loss will depends on

 Thickness
 Flux density
All of these
 Frequency

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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.
  continue running in the same direction as before.
  run in a direction opposite to previous one.
  get damaged.

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Electrical Machines
Hysteresis loss is proportional to

 f1.5.
 f2.
  f.
 f3.

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Electrical Machines
Short circuiting is caused in the armature winding due to

  grounding of two or more turns of the same coil.
 failure of insulation between two commutator bars.
  any of above.
  failure of insulation between two turns of coil.

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