What is the use of step-up transformer?

Important Questions on Alternating Current

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2018>Q 1

In AC circuit, the current and voltage are given by $I = 5 \cos wt and V= 200 \sin wt$respectively. Power loss in the circuit is:

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 2

The power factor of $L-R$ circuit is-

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 3

The ratio of root mean square (rms) value and peak value of an alternating in-

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 4

In a step-up transformer, no. of turns in primary and secondary coils are $N_1$ and $N_2$, then-

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 5

In an alternating current circuit, the phase difference between current $I$ and voltage is $\varphi$, then the wattless component of current will be-

MEDIUM

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 6

Establish the relation between mean value and peak value of AC.

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 7

What are reactance and impedance in the alternating current circuits?

EASY

12th Bihar Board

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 7 - Alternating Current>Bihar Board-2019>Q 8

Describe the principle, construction and working of a transformer.