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Electrical Machines

Electrical Machines
When flux density is constant in a transformer, hysteresis loss varies as

 f
 V
 V²
 f²

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Electrical Machines
The speed of a 3-phase induction motor operating in its stable region

 increases with increase in the load torque.
 remains constant.
 decreases with decrease in the load torque.
 decreases with increase in the load torque.

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Electrical Machines
A 500 V, 120 KW, 50 Hz, star connected synchronous motor operating at 0.8 power factor leading has full load efficiency of 91%. The armature resistance is equal to 0.08Ω. The magnitude of armature current is nearly equal to

 240 A.
 127 A.
  190 A.
 173 A.

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

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

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Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the hysteresis loss.
None of these
  reduces the saturation magnetization.
  increases the electrical resistivity of iron.

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Electrical Machines
Slip test is performed to determine

 positive sequence reactance and negative sequence reactance
All of these
 slip
 direct axis reactance and quadrature axis reactance

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