EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2020>Q 2

EASY

KEAM

IMPORTANT

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Choose the wrong statement for the pure inductive circuit.

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Important Questions on Alternating Current

HARD

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2018>Q 3

A voltage

V_{PQ} = V_{0} \cos (ωt)

(where,

V_{0}

is a real amplitude) is applied between the points

P

and

Q

in the network shown in the figure. The values of capacitance and inductance are

C = \frac{1}{ω R \sqrt{3}}

and

L = \frac{R \sqrt{3}}{ω}

. Then, the total impedance between

P

and

Q

is

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KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2019>Q 4

In an

L C R

series circuit (of inductance

L,

capacitance

C

and resistance

R),

the impedance is minimum when the angular frequency of the source is given by

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2019>Q 5

The

Q

factor for a damped oscillator is given by the

EASY

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2018>Q 6

An alternating voltage

V = V_{0} \sin ω t

is applied across a circuit and as a result, a current

I = I_{0} \sin (ω t + \frac{π}{2})

flows in it. The power consumed per cycle is

MEDIUM

KEAM

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 28 - Alternating Current>KEAM 2020>Q 7

A transformer operates at

V_{p} = 6 kV

on the primary side and supplies electric energy at

V_{S} = 220 V

to a number of houses in a town. If the total power consumption of the town is

7.2 kW

, the current (in amperes) in the primary is