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PHXII15:COMMUNICATION SYSTEMS

356752 In frequency modulation

1 Frequency of CW remains constant but amplitude changes in accordance with modulating wave frequency

2 Frequency of

C W

changes in accordance with the modulating wave frequency but the amplitude also changes

3 Frequency of CW changes in accordance with the frequency of modulating wave frequency but the amplitude remains constant

4 Frequency of CW changes in accordance with the amplitude of modulating wave amplitude

PHXII15:COMMUNICATION SYSTEMS

356753 Which of the following modulated signal has the best noise-tolerance?

1 Long-wave

2 Short-wave

3 Medium-wave

4 Amplitude-modulated

JEE - 2013

PHXII15:COMMUNICATION SYSTEMS

356754 A modulating signal is a square wave as shown in the figure
supporting img
The carrier wave is given by
$c (t) = 2 \sin (8 π t) v o l t s$ .
The modulation index is

1 2

2 0.75

3 0.5

4 1.5

Explanation:

$μ = \frac{A_{m}}{A_{c}} = \frac{1}{2} = 0.5$

PHXII15:COMMUNICATION SYSTEMS

356755 A carrier wave of peak voltage $12 V$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75 %$ is

1

6 V

2

9 V

3

4 V

4

15 V

Explanation:

$μ = \frac{A_{m}}{A_{c}} \Rightarrow \frac{3}{4} = \frac{A_{m}}{12} \Rightarrow A_{m} = 9 V$

PHXII15:COMMUNICATION SYSTEMS

356752 In frequency modulation

1 Frequency of CW remains constant but amplitude changes in accordance with modulating wave frequency

2 Frequency of

C W

changes in accordance with the modulating wave frequency but the amplitude also changes

3 Frequency of CW changes in accordance with the frequency of modulating wave frequency but the amplitude remains constant

4 Frequency of CW changes in accordance with the amplitude of modulating wave amplitude

PHXII15:COMMUNICATION SYSTEMS

356753 Which of the following modulated signal has the best noise-tolerance?

1 Long-wave

2 Short-wave

3 Medium-wave

4 Amplitude-modulated

JEE - 2013

PHXII15:COMMUNICATION SYSTEMS

356754 A modulating signal is a square wave as shown in the figure
supporting img
The carrier wave is given by
$c (t) = 2 \sin (8 π t) v o l t s$ .
The modulation index is

1 2

2 0.75

3 0.5

4 1.5

Explanation:

$μ = \frac{A_{m}}{A_{c}} = \frac{1}{2} = 0.5$

PHXII15:COMMUNICATION SYSTEMS

356755 A carrier wave of peak voltage $12 V$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75 %$ is

1

6 V

2

9 V

3

4 V

4

15 V

Explanation:

$μ = \frac{A_{m}}{A_{c}} \Rightarrow \frac{3}{4} = \frac{A_{m}}{12} \Rightarrow A_{m} = 9 V$

PHXII15:COMMUNICATION SYSTEMS

356752 In frequency modulation

1 Frequency of CW remains constant but amplitude changes in accordance with modulating wave frequency

2 Frequency of

C W

changes in accordance with the modulating wave frequency but the amplitude also changes

3 Frequency of CW changes in accordance with the frequency of modulating wave frequency but the amplitude remains constant

4 Frequency of CW changes in accordance with the amplitude of modulating wave amplitude

PHXII15:COMMUNICATION SYSTEMS

356753 Which of the following modulated signal has the best noise-tolerance?

1 Long-wave

2 Short-wave

3 Medium-wave

4 Amplitude-modulated

JEE - 2013

PHXII15:COMMUNICATION SYSTEMS

356754 A modulating signal is a square wave as shown in the figure
supporting img
The carrier wave is given by
$c (t) = 2 \sin (8 π t) v o l t s$ .
The modulation index is

1 2

2 0.75

3 0.5

4 1.5

Explanation:

$μ = \frac{A_{m}}{A_{c}} = \frac{1}{2} = 0.5$

PHXII15:COMMUNICATION SYSTEMS

356755 A carrier wave of peak voltage $12 V$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75 %$ is

1

6 V

2

9 V

3

4 V

4

15 V

Explanation:

$μ = \frac{A_{m}}{A_{c}} \Rightarrow \frac{3}{4} = \frac{A_{m}}{12} \Rightarrow A_{m} = 9 V$

PHXII15:COMMUNICATION SYSTEMS

356752 In frequency modulation

1 Frequency of CW remains constant but amplitude changes in accordance with modulating wave frequency

2 Frequency of

C W

changes in accordance with the modulating wave frequency but the amplitude also changes

3 Frequency of CW changes in accordance with the frequency of modulating wave frequency but the amplitude remains constant

4 Frequency of CW changes in accordance with the amplitude of modulating wave amplitude

PHXII15:COMMUNICATION SYSTEMS

356753 Which of the following modulated signal has the best noise-tolerance?

1 Long-wave

2 Short-wave

3 Medium-wave

4 Amplitude-modulated

JEE - 2013

PHXII15:COMMUNICATION SYSTEMS

356754 A modulating signal is a square wave as shown in the figure
supporting img
The carrier wave is given by
$c (t) = 2 \sin (8 π t) v o l t s$ .
The modulation index is

1 2

2 0.75

3 0.5

4 1.5

Explanation:

$μ = \frac{A_{m}}{A_{c}} = \frac{1}{2} = 0.5$

PHXII15:COMMUNICATION SYSTEMS

356755 A carrier wave of peak voltage $12 V$ is used to transmit a message signal. The peak voltage of the modulating signal in order to have a modulation index of $75 %$ is

1

6 V

2

9 V

3

4 V

4

15 V

Explanation:

$μ = \frac{A_{m}}{A_{c}} \Rightarrow \frac{3}{4} = \frac{A_{m}}{12} \Rightarrow A_{m} = 9 V$

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