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

Write an expression for the impedances of a LCR-series circuit. In which condition these impedances is minimum?

A step-down transformer converts $2200$Volt transmission line voltage to $220$ Volts. Number of turns in secondary coil are $500$. Evaluate the number of turns in primary coil.

The maximum value of power factor in alternating current LCR circuit is-

What is the principle of working of a transformer? Write any one reason for energy loss in transformer.

Write the relation between root mean square value and peak value of alternating current.

A power transmission line feeds input power at $2300\mathrm{V}$ 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 $230\mathrm{V}$?

What is meant by Wattless current? Clarify.

A light bulb and an open coil inductor are connected to an ac source through a key as shown in figure. The switch is closed and after sometime, an iron rod is inserted into the interior of the inductor. What will be effect on glow of light bulb while inserting the rod. Give your answer with reason.