Modulation
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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 \(CW\) 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
\({\rm{c}}\left( t \right) = 2\sin \left( {8\pi t} \right)\,\,volts\).
The modulation index is

1 2
2 0.75
3 0.5
4 1.5
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 \(9V\)
3 \(4V\)
4 \(15V\)
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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 \(CW\) 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
\({\rm{c}}\left( t \right) = 2\sin \left( {8\pi t} \right)\,\,volts\).
The modulation index is

1 2
2 0.75
3 0.5
4 1.5
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 \(9V\)
3 \(4V\)
4 \(15V\)
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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 \(CW\) 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
\({\rm{c}}\left( t \right) = 2\sin \left( {8\pi t} \right)\,\,volts\).
The modulation index is

1 2
2 0.75
3 0.5
4 1.5
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 \(9V\)
3 \(4V\)
4 \(15V\)
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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 \(CW\) 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
\({\rm{c}}\left( t \right) = 2\sin \left( {8\pi t} \right)\,\,volts\).
The modulation index is

1 2
2 0.75
3 0.5
4 1.5
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 \(9V\)
3 \(4V\)
4 \(15V\)
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