NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 14

MEDIUM

12th ICSE

IMPORTANT

Earn 100

What is the ‘power factor* of an $L - C - R$ circuit? What are its maximum and minimum values and under what conditions?

Important Questions on Alternating Current

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 15

What is the power factor of an

L - C - R

circuit at resonance?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 16

An ideal inductor in an AC circuit consumes no power, though both

V

and

I

are non-zero. Why?

EASY

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 17

Prove that an ideal capacitor connected to an

AC

source does not dissipate power.

EASY

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IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 18

Can a capacitor of suitable capacitance replace a choke coil in an

AC

circuit?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 19

What is main advantage of

AC

over

DC

due to which

AC

is used?

MEDIUM

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 20

In a series

L - C

circuit, the voltages across L and

C

are

180 °

out of phase; while in a parallel

L - C

circuit, the current in

L

and

C

are out of phase. Explain.

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 21

In any

AC

series circuit, is the applied instantaneous voltage equal to the algebraic sum of the instantaneous voltages across the different elements of the circuit? Is the same true for rms voltages?

EASY

12th ICSE

IMPORTANT

NOOTAN ISC PHYSICS Class 12 Part-1>Chapter 12 - Alternating Current>QUESTIONS>Q 22

In the adjoining $AC$ circuit, $R$ is a pure resistance and $X$ is an unknown circuit element. Using only an $AC$ voltmeter how will you detect whether $X$ is (i) pure inductance ?

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