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Modulation And Demodulation - Questions and Answers

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6. In super-hetrodyne radio receiver, the frequency of selected radio wave is converted to
A. a higher frequency
B. an intermediate frequency
C. an audio frequency
D. a microwave frequency
Explanation:
7. the number of modulation techniques is
A. four
B. three
C. two
D. one
Explanation:
8. In frequency modulation,
A. frequency of the carrier wave remains constant
B. amplitude of the carrier wave remains the same
C. both the frequency and amplitude of the carrier wave vary
D. signal is distorted
Explanation:
9. The process of extracting the signal from the modulated wave is called
A. resonance
B. amplification
C. detection
D. modulation
Explanation:
10. One of the following gives noiseless reception
A. amplitude modulation
B. phase modulation
C. frequency modulation
D. amplitude modulated or phase modulated
Explanation:
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