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Modulation And Demodulation - Questions and Answers

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11. Super-hetrodyne receiver has
A. maximum stability, selectivity and sensibility
B. maximum stability, selectivity and minimum sensibility
C. maximum sensibility, minimum selectivity and stability
D. minimum stability, selectivity and sensibility
Explanation:
12. Diode can be used as
A. an oscillator
B. an amplifier
C. a detector
D. a modulator
Explanation:
13. In TV, an electrical disturbance (noise) affects
A. neither the video nor the audio signals
B. only the audio signals
C. both the video and audio signals
D. only the video signals
Explanation:
14. One of the following converts sound waves into AF signals
A. loudspeaker
B. rectifier
C. microphone
D. antenna
Explanation:
15. The main advantage of frequency modulation over amplitude modulation is
A. that there will be no distortion
B. that the complete information is contained in the side bands
C. that it uses a wider band of frequencies
D. the elimination of noises
Explanation:
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