Physics · 2021
JEE Main · 24 February 2021, Shift 1 · Q30
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,…
A common transistor radio set requires $\displaystyle 12$ V (D.C.) for its operation. The D.C. source is constructed by using a transformer and a rectifier circuit, which are operated at $\displaystyle 220$ V (A.C.) on standard domestic A.C. supply. The number of turns of secondary coil are $\displaystyle 24$ , then the number of turns of primary are \_\_\_\_.
Official answer
440
More from Alternating Current
- A series LCR circuit with R=250/11 Ω and X_L=70/11 Ω is connected across a 220 V, 50 Hz supply. The value of capacitance needed to maximize the…2022
- In an a.c. circuit, voltage and current are given by: V=100 sin (100 t) V and I=100 sin (100 t+(π)/3) mA respectively. The average power dissipated…2024
- A alternating current at any instant is given by i=[6+√56 sin (100 π t+π / 3)] A. The rms value of the current is ____ A.2024
- Match List - I with List - II: Choose the correct answer from the options given below:2021
- A series LCR circuit driven by 300 V at a frequency of 50 Hz contains a resistance R=3 k Ω, an inductor of inductive reactance X_L=250 π Ω and an…2021
- For the given circuit, comment on the type of transformer used.2021
- To increase the resonant frequency in series LCR circuit,2022
- An alternating voltage source V=260 sin (628 t) is connected across a pure inductor of 5 mH. Inductive reactance in the circuit is:2023
JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.