Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  less than one.
  very low
  greater than one.
  approx to one.

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

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

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