Electrical Machines
If a transformer has turns ratio K, the primary and secondary current are I1 and I2 respectively and magnetizing current and core loss component of no load current Iμ and Iw respectively, then

 I1 = KI2 + Iμ.
 I1 = KI2.
  I1 = KI2 + Iw + Iμ.ok
 I1 = KI2 + Iw.

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

 power factor and supply voltage during hunting.
  power factor and DC excitation at constant load.
 supply voltage and excitation current at constant load.
 supply voltage and field current at constant excitation.

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Electrical Machines
Armature reaction in a DC machine

 makes an angle with the main pole axis which is load dependent.
  makes an angle of 90° with the main pole axis.
 is in the same direction as the main poles.
 is in direct opposition to the main poles.

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