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Q' Seleet the best answer for only FOUR of the following : 1.Which of the following statements are true: -An HF communication cannot be develoned vis eround waves B. The main phenomena for sonospheric communication is the retraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is net preseat 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.

Q' Seleet the best answer for only FOUR of the following : 1.Which of the following statements are true: -An HF communication cannot be develoned vis eround waves B. The main phenomena for sonospheric communication is the retraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is net preseat 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.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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O' Select the best answer for only FOUR of the following : 1.Which of the following statements are true: A. An HF communication cannot be develoned vis eround waves B. The main phenomena for sonospheric communication is the retraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is net present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C.Amplitude limiter D. AF ampliude. 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. S. A carrier of 880 kHz is modulated by 3.5H. 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:O' Select the best answer for only FOUR of the following : 1.Which of the following statements are true: A. An HF communication cannot be develoned vis eround waves B. The main phenomena for sonospheric communication is the retraction. HF communication is preferred for long-distance communications. D. All of the above 2. Which of the following stage is net present in AM receiver as compared to FM receiver A. AM amplifier B. Demodulator C.Amplitude limiter D. AF ampliude. 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. S. A carrier of 880 kHz is modulated by 3.5H. 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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