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Electrical Machines

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

 f
 V²
 V
 f²

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Electrical Machines
For P pole machine relation between electrical degrees and mechanical degrees is

 θelec = 4/P*θmech
 θelec = 2/P*θmech
 θelec = θmech
 θelec = P/2*θmech

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Electrical Machines
In above questions, find the power delivered by each of the alternators to a load of impedance 6Ω(resistive)

 6000 W, 7000 W.
  3190 W, 5040 W.
 100 W, 2000 W.
 1000 W, 5040 W.

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

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

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Electrical Machines
Centrifugal switch is absent in which of the single phase induction motor?

 Split phase motor.
  PSC (permanent split capacitor) motor.
 Shaded pole motor.
None of these

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Electrical Machines
The direction of rotation of conductor of a DC motor can be determined by

 Fleming's right hand rule.
 Ampere law.
 Fleming's left hand rule.
 Lenz's law.

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