Analog Communications Questions and Answers – Varactor Diode

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This set of Analog Communications Multiple Choice Questions & Answers (MCQs) focuses on “Varactor Diode”.

1. Which layer is used for detection of bad frames in wide area network?
a) frame layer
b) link layer
c) physical layer
d) session layer
View Answer

Answer: b
Explanation: Wide area network covers a long geographical area and thus it also has least connected devices. Link layer is used in WAN for detection of bad frames.

2. TEM stands for Transmitted Electromagnetic wave.
a) True
b) False
View Answer

Answer: b
Explanation: TEM stands for Transverse Electromagnetic wave. Since both electric and magnetic field are transverse to the direction of wave propagation.

3. What is the reason of attenuation in free space?
a) decrease in energy per square meter due to expansion
b) decrease in energy per square meter due to compression
c) losses in upper atmosphere due to expansion
d) losses in upper atmosphere due to compression
View Answer

Answer: a
Explanation: In free space, the basic reason of attenuation is the decrease in energy per square meter. It generally happens due to expansion.
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4. What is the range of UHF?
a) below the microwave range
b) above the microwave range
c) same as the microwave range
d) it does not include the microwave range in any way
View Answer

Answer: a
Explanation: Ultra high frequency is the ITU designation for radio frequencies that lies under 300MHz to 3 GHz i.e. its range is below the microwave range.

5. Striplines and microstrips are used to __________
a) couple sections of waveguide
b) couple waveguides to antennas
c) couple components on a circuit board
d) couple electromagnetic waves in an order
View Answer

Answer: c
Explanation: The main use of Striplines and microstrips in any circuit is to couple components on a circuit board.
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6. What is the another term used for a single microwave link?
a) section
b) hop
c) link
d) skip
View Answer

Answer: b
Explanation: Microwave link is a communication system that uses a beam of radio waves in the microwave frequency range. Hop is also used in places of single microwave link.

7. In digital microwave systems, additional repeaters increase the ________
a) selectivity
b) noise level
c) jitter
d) sensitivity
View Answer

Answer: c
Explanation: In telecommunication, jitter can be seen as a deviation from true periodicity of a presumably periodic signal. Higher level of jitter are more likely to occur on either slow or heavily congested link. In any circuit, adding additional repeaters finally increase the jitter only.
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To practice all areas of Analog Communications, here is complete set of 1000+ Multiple Choice Questions and Answers.

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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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