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1.Which of the following statements are true: A. An HF communication cannot be develoned via eround waves. B. The main phenomena for 1onospheric communication is the refraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is not present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C. Amplitude limiter D.AF amplitude. 3. What is the maximum efficiency for AM modulation A. about 70.667 % B. about 50.457 % C. about 44.222 % D. None of the above.

1.Which of the following statements are true: A. An HF communication cannot be develoned via eround waves. B. The main phenomena for 1onospheric communication is the refraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is not present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C. Amplitude limiter D.AF amplitude. 3. What is the maximum efficiency for AM modulation A. about 70.667 % B. about 50.457 % C. about 44.222 % D. None of the above.

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1.Which of the following statements are true: A. An HF communication cannot be develoned via eround waves. B. The main phenomena for 1onospheric communication is the refraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is not present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C. Amplitude limiter D. AF amplitude. 3. What is the maximum efficiency for AM modulation A. about 70.667 % B. about 50.457 % C. about 44.222 % D. None of the above. 4. The modulation index of a narrowband FM signal is A. nearly equal to 0.3 B. much less than unity C. nearly 0.5 D. much more than unity. 5. A carrier of 880 kHz is modulated by 3.5kHz sine wave. The LSB and USB are : A. 873 and 887 kHz. B. 876.5 and 883.5 kHz. C. 883.5 and 876.5 kHz. D. 887 and 873 kHz.
Transcribed Image Text:1.Which of the following statements are true: A. An HF communication cannot be develoned via eround waves. B. The main phenomena for 1onospheric communication is the refraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is not present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C. Amplitude limiter D. AF amplitude. 3. What is the maximum efficiency for AM modulation A. about 70.667 % B. about 50.457 % C. about 44.222 % D. None of the above. 4. The modulation index of a narrowband FM signal is A. nearly equal to 0.3 B. much less than unity C. nearly 0.5 D. much more than unity. 5. A carrier of 880 kHz is modulated by 3.5kHz sine wave. The LSB and USB are : A. 873 and 887 kHz. B. 876.5 and 883.5 kHz. C. 883.5 and 876.5 kHz. D. 887 and 873 kHz.
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