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

A power transmission line feeds input power at 2300 V to a step-down transformer with its primary windings having 4000 turns giving the output power at 230 V. If the current in the primary coil of the transformer is 5 A and its efficiency is 90 %, the output current would be:
  1. 45 A
  2. 50 A
  3. 20 A
  4. 25 A

Solution

Efficiency, η=0.9=PsPp

VsIs=0.9 × VpIp

Is=0.9 ×2300 ×5230=45 A

Asked in: JEE Main 2018 (16 Apr Online)

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