JEE Main 2019PhysicsAlternating CurrentEasyMCQ

JEE Main 2019 — Alternating Current Question with Solution

JEE Main 2019 (09 Jan Shift 2)

Question

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:

Choose an option

Show full solutionCorrect option: D
Correct answer
D45 A

Step-by-step explanation

Efficiency n=90%

⇒0.9×power in=Power out

0.9×2300×5=230×Iout

Iout=45 A

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About this question

This is a previous-year question from JEE Main 2019, covering the Alternating Current chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.