Electrical Machines
An auto transformer having a transformation ratio of 0.8 supplies a load pf 10 KW. The power transfered inductively from the primary to secondary is

 10 KW.
 8 KW.
 0.
  2 KW.

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current increase.
 Back emf falls and line current increase.
  Back emf increase but line current falls.
 Both back emf as well as line current fall.

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