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Electrical Machines

Electrical Machines
Hysteresis loop represents the area of

 total iron losses
 copper loss
 eddy current loss
 hysteresis loss

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Electrical Machines
In IM the rotor lamination can be ________________ than stator laminations.

  rotor can not have any laminations.
  sipper.
  thicker.
  thinner.

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Electrical Machines
A 220 V, DC shunt motor is operating at a speed of 1440 rpm. The armature resistance is 1.0 Ω and armature current is 10 A. of the excitation of the machine is reduced by 10%, the extra resistance to be put in the armature circuit to maintain the same speed and torque will be

 2 .1 Ω
 3.1 Ω
 1.8 9 Ω
 1.79 Ω

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Electrical Machines
A 10KVA auto transformer, turn ratio is 0.4. Find the power transferred inductively?

 4 KVA
 0 KVA
 6 KVA
 10 KVA

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Electrical Machines
The field divertor resistance for a DC series motor is of order of

 0.1 Ω
 50 Ω
 100 Ω
 10 Ω

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Electrical Machines
What is the function of inter pole in DC generator?

  Both option B and C.
 To get a superior commutation.
 To serve the economical aspects.
 To neutralize the distortion of main field flux due to armature reaction.

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