Analog Communications Questions and Answers – Demodulation of DSB-SC

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This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Demodulation of DSB-SC”.

1. Flyback switched mode is used in television because it does not require a filter choke.
a) True
b) False
View Answer

Answer: a
Explanation: Flyback switched mode is used in television because it does not require filter choke. It is also cheap as compared to others.

2. Waves of frequency 60MHz can penetrate the atmosphere.
a) True
b) False
View Answer

Answer: a
Explanation: Most Radio Waves penetrate the atmosphere. Thus, frequencies above 30MHz can penetrate the atmosphere. So 60 MHz can penetrate the atmosphere.

3. Ground wave travels along surface of ground.
a) True
b) False
View Answer

Answer: a
Explanation: Ground wave propagation occurs in the area between the surface of the Earth and the Ionosphere. The wave travels parallel or along the surface of the ground. It is usually used for transmission of low frequency signals.
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4. TM stands for _________
a) Trans positional Modulation
b) Time Multiplexing
c) Transit Modulation
d) Tuned Modulation
View Answer

Answer: a
Explanation: TM stands for Transpositional Modulation. In TM, the message signal is modulated by inserting inflections in the original waveform. The waveform is modified resulting in a modulated signal where each quarter cycle is transposed in modulation process.

5. In which of the modulation, the waveform is modified resulting in a signal where each quarter cycle is transposed.
a) AM
b) FM
c) PM
d) TM
View Answer

Answer: d
Explanation: In TM, the message signal is modulated by inserting inflections in the original waveform. The waveform is modified resulting in a modulated signal where each quarter cycle is transposed in modulation process.
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6. Which of the following is a reflector antenna?
a) Marconi reflector antenna
b) Corner reflector antenna
c) Helical antenna
d) Bow tie antenna
View Answer

Answer: b
Explanation: It is corner reflector antenna that comes under reflector antenna. Helical antenna and bow tie antenna comes under travelling wave antenna and log antenna respectively. Marconi reflector antenna comes under grounded antenna.

7. Carbon microphone has a bidirectional feature.
a) True
b) False
View Answer

Answer: b
Explanation: Carbon microphone does not have a bidirectional feature. It is ribbon microphone that has bidirectional feature.

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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