Embibe Experts Solutions for Chapter: Alternating Current, Exercise 1: Kerala Board-2018

The phaser diagram of the alternating voltage across an unknown device $\mathrm{X}$ and current flowing through it are shown below.

Draw the phaser diagram which shows the relation among ${\mathrm{V}}_{\mathrm{R}}, {\mathrm{V}}_{\mathrm{L}}, {\mathrm{V}}_{\mathrm{C}}$ and $\mathrm{I}$ In a series L.C.R circuit.

A series L.C.R circuit connected to an $\mathrm{AC}$ Source is shown below:

Write an expression for impedance offered by this circuit.

A series LCR circuit connected to an ac source is shown below:

Under what condition this circuit is used for tuning radio?

A transformer is used to charge the alternating voltage to a high or low value. What is the principle of a transformer?

A transformer is used to charge the alternating voltage to a high or low value.

A power transmission line feeds input power of $230 \mathrm{V}$ to a step-down transformer with its primary windings having $4000$ turns. What should be the number of turns in the secondary in order to get output power at $230 \mathrm{V}$?

The current through an AC circuit depends on the magnitude of the applied voltage and impedance of the circuit.

Write any two factors on which the impedance of a series LCR circuit depends.

The current through an AC circuit depends on the magnitude of the applied voltage and impedance of the circuit.

Draw and impedance diagram of a series LCR circuit and write the expression for the power factor from the diagram.

The current through an AC circuit depends on the magnitude of the applied voltage and impedance of the circuit.

A sinusoidal voltage of peak value $283 \mathrm{V}$ and frequency $50 \mathrm{Hz}$ is applied to a series LCR circuit in which $\mathrm{R}=3 \mathrm{\Omega }, \mathrm{L}=25.48 \mathrm{mH}, \mathrm{and} \mathrm{C}=796 \mathrm{\mu F}$. Find the impedance of the circuit.