A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings…

A power transmission line feeds input power at 2300 V to a step down transformer with its primary windings having 4000 turns. The output power is delivered at 230 V by the transformer. If the current in the primary of the transformer is 5 A and its efficiency is 90 %, the output current would be:
  1. 35 A
  2. 25 A
  3. 50 A
  4. 45 A

Solution

Efficiency n=90%

⇒0.9×power in=Power out

0.9×2300×5=230×Iout

Iout=45 A

Asked in: JEE Main 2019 (09 Jan Shift 2)

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