Match List I with List II List I List II (A) Facsimile (I) Static Document Image (B) Guided media Channel (II) Local Broadcast Radio (C) Frequency Modulation (III) Rectangular wave (D) Digital Signal (IV) Optical Fiber Choose the correct answer from the following options

A - I , B - IV , C - II , D - III

A - IV , B - III , C - II , D - I

A - IV , B - II , C - III , D - I

A - I , B - II , C - III , D - IV

Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that typically contains information to be transmitted.

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If $E_{c} = 20 \sin 10^{5} π t$ and $E_{m} = 10 \sin 400 π t$ are carrier and modulating signals respectively, he modulation index

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Important Questions on Electromagnetic Waves and Communication System

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Define modulation. Why is it necessary?

HARD

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

A modulated signal

C_{m} (t)

has the form

C_{m} (t) = 30 \sin 300 π t + 10 (\cos 200 π t - \cos 400 π t) .

The carrier frequency

f_{c}

, the modulating frequency (message frequency)

f_{m ,}

and the modulation index

μ

are respectively given by :

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

In the broadcast of communication modulation is necessary.

$(b)$ Explain any two reason why modulation is necessary ?

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

It is desired to transmit an electronic signal in the Audio Frequency (AF) range. Which of the following statements on amplitude modulation of the signal by a carrier wave is NOT TRUE?

MEDIUM

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

With reference to communication systems, what is meant by modulation?

HARD

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

What is modulation? Discuss qualitatively about amplitude modulation and frequency modulation. Mention the advantages of frequency modulation over amplitude modulation.

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

In the broadcast of communication modulation is necessary.

$(a)$ What do you mean bY modulation ?

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

A carrier wave is used to transmit a message signal. If the peak voltage of modulating signal and carrier signal are increased by

1 %

and

3 %

respectively, the modulation index is changed by

HARD

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

What is modulation? A message signal frequency

10 kHz

and peak voltage of

10

volts is used to modulate a carrier of frequency

1 MHz

and peak voltage of

20

volts. Determine modulation index and the side bands produced.

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Define modulation. Why is it necessary?

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Match List I with List II

	List I		List II
(A)	Facsimile	(I)	Static Document Image
(B)	Guided media Channel	(II)	Local Broadcast Radio
(C)	Frequency Modulation	(III)	Rectangular wave
(D)	Digital Signal	(IV)	Optical Fiber

Choose the correct answer from the following options

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

A sinusoidal voltage amplitude modulates another sinusoidal voltage of amplitude

2 kV

to result in two side bands, each of amplitude

200 V .

Find the modulation index.

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

AM

modulation, a signal is modulated on a carrier wave such that maximum and minimum amplitude are found to be

6 V

and

2 V

respectively. The modulation index is

MEDIUM

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Define modulation. Why modulation is necessary?

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Find the modulation index of an AM wave having

8 V

variation where maximum amplitude of the AM wave is

9 V

HARD

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

The modulation frequency of an

A M

radio station is

250 kHz,

which is

10 %

of the carrier wave. If another

A M

station approaches you for license what broadcast frequency will you allot?

HARD

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

A signal of $5 kHz$ frequency is amplitude modulated on a carrier wave of frequency $2 MHz$ . The frequencies of the resultant signal is/are:

EASY

Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

Define Modulation.

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

In a communication system, what is meant by modulation? State any two types of modulation.

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Physics>Modern Physics>Electromagnetic Waves and Communication System>Modulation

A carrier wave

V_{C} (t) = 160 \sin (2 π \times 10^{6} t)

volts is made to vary between

V_{\max} = 200 V

and

V_{\min} = 120 V

by a message signal

V_{m} (t) = A_{m} \sin (2 π \times 10^{3} t)

volts. The peak voltage

A_{m}

of the modulating signal is,

If Ec=20sin⁡105 πt and Em=10sin⁡400 πt are carrier and modulating signals respectively, he modulation index

Important Questions on Electromagnetic Waves and Communication System

Learn and Prepare for any exam you want !

If $E_{c} = 20 \sin 10^{5} π t$ and $E_{m} = 10 \sin 400 π t$ are carrier and modulating signals respectively, he modulation index