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If the peak message signal amplitude is half the peak amplitude of the carrier signal, the signal is modulatedIf the peak message signal amplitude is half the peak amplitude of the carrier signal, the signal is modulated.
The answer is:
C. 50%
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A percentage of modulation greater than |
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Single sideband AM systems occupy same bandwidth as of conventional AM systemsSingle sideband AM systems occupy same bandwidth as of conventional AM systems.
The answer is:
B. false
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How is the performance of SSB AM systems in fading channels?How is the performance of SSB AM systems in fading channels?
The answer is:
A. poor
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Which of the following is a disadvantage of tone-in-band SSB system?Which of the following is a disadvantage of tone-in-band SSB system?
The answer is:
D. generation and reception of signal is complicated
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FFSR in AM systems stands forFFSR in AM systems stands for
The answer is:
A. feedforward signal regeneration
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AM demodulation technique can be divided into and demodulationAM demodulation technique can be divided into and demodulation.
The answer is:
C. coherent, noncoherent
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Non coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiverNon coherent detection requires the knowledge of transmitted carrier frequency and phase at the receiver.
The answer is:
B. false
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A product detector in AM systems is also calledA product detector in AM systems is also called
The answer is:
D. phase detector
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AM system use only product detector for demodulation. They never use envelope detectorsAM system use only product detector for demodulation. They never use envelope detectors.
The answer is:
B. false
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LCD usesLCD uses
The answer is:
B. twisted nematic crystals
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Which of the following stage is present in FM receiver but not in AM receiver?Which of the following stage is present in FM receiver but not in AM receiver?
The answer is:
A. amplitude limiter
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Function of duplexer in a RADAR is to permit the use of same antenna for transmission and receptionFunction of duplexer in a RADAR is to permit the use of same antenna for transmission and reception.
The answer is:
A. true
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Single Sideband Modulation (SSB) is generally reserved for point-to-point communicationSingle Sideband Modulation (SSB) is generally reserved for point-to-point communication.
The answer is:
A. true
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For an AM transmitter, class C amplifier can be used after the modulation stageFor an AM transmitter, class C amplifier can be used after the modulation stage.
The answer is:
B. false
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For which of the modulated system, the linear amplified modulated stage is used?For which of the modulated system, the linear amplified modulated stage is used?
The answer is:
A. low level amplitude modulated system
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When noise is passed through a narrow band filter, the output of filter should be?When noise is passed through a narrow band filter, the output of filter should be?
The answer is:
D. sinusoidal
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A narrow band noise can exist inA narrow band noise can exist in
The answer is:
D. am and fm both
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The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be?The upper and lower sideband frequencies for 5KHz amplitude modulation with a 30KHz carrier frequency will be?
The answer is:
A. 35khz and 25khz
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Phase array radar can track many targets together |
total MCQs: 126
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