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Electrical Machines

Electrical Machines
Which motor cannot be started on no load?

 both B and C
 series motors
 cumulative compound motors
 shunt motors

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Electrical Machines
The armature core of the rotor bars of dc motors are laminated

  to provide better flux linkage.
  to reduce hysteresis loss.
  to reduce eddy current loss.
  to reduce mechanical losses.

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

 decreases.
 increases.
 decreases
 remains constant.

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Electrical Machines
When maximum flux density is constant, the eddy current losses are proportional to

 V2
 V
 f
 f2

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Electrical Machines
In double cage induction motor, the outer cage offers

  low resistance and high reactance.
  high resistance and high reactance.
  high resistance and low reactance.
  low resistance and low reactance.

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Electrical Machines
Flux density under leading pole tips in case of generator will

 decrease
None of these
 increase
 either increase or decrease

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