Student Login

Home›Chapters›Alternating Current PYQs›AC Generator & Transformer›Question 44

JEE Main 2021 (24 Feb, Shift 1) · AC Generator & Transformer

AC Generator & Transformer question from JEE Main 2021 (24 Feb, Shift 1)

Q44JEE Main 2021 · 24 FEB · SHIFT 1Difficult

AC Generator & Transformer

A common transistor radio set requires 12 V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at 220 V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are 24, then the number of turns of primary are ___________.

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 440

Secondary must give 12 V, primary is at 220 V.
$\dfrac{N_p}{N_s} = \dfrac{V_p}{V_s} \Rightarrow N_p = 24 \times \dfrac{220}{12}$
$N_p = 440$ turns

Report a mistake

More questions on AC Generator & Transformer

A step-up transformer has 300 turns of primary winding and 450 turns of secondary…MHT CET 2020 (16 Oct, Shift 2)
A 220 V input is supplied to a transformer. The output circuit draws a current of 2.0 A…MHT CET 2019 (3 May, Shift 1)
A transformer consisting of 300 turns in the primary and 150 turns in the secondary gives…JEE Main 2019 (10 Apr, Shift 1)
A power transmission line feeds input power at 2300 V to a step down transformer with its…JEE Main 2019 (9 Jan, Shift 2)
A power transmission line feeds input power at 2300 V to a step down transformer with its…JEE Main 2018 (16 Apr, Shift 1)
A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the…NEET 2014 (AIPMT)
The primary of a transformer when connected to a dc battery of 10 Volt draws a current of…NEET 2013
A 220 volt input is supplied to a transformer. The output circuit draws a current of 2.0…NEET 2010 (AIPMT, Prelims)