250+ TOP MCQs on Link Budget Analysis and Error Control & Answers

Digital Communication quiz on “Link Budget Analysis and Error Control”.

1. Field of view is ______ to antenna gain.
A. Proportional
B. Inversely proportional
C. Half the
D. Double
Answer: B
Clarification: The antenna field of view is the measure of a solid angle in which most of the field power is concentrated. It is inversely related to antenna gain.

2. Antenna gain ______ as effective area increases.
A. Increases
B. Decreases
C. Remains same
D. None of the mentioned
Answer: A
Clarification: Antenna gain increases with a decrease in wavelength increase in frequency and increase in effective area.

3. The beam-width becomes narrower on
A. Increasing frequency
B. Increasing antenna size
C. Increasing frequency & antenna size
D. None of the mentioned
Answer: C
Clarification: Increasing either the signal frequency or antenna size results in narrower beam-width.

4. Path loss Ls is dependent on
A. Signal power
B. Effective area
C. Wavelength
D. Antenna size
Answer: C
Clarification: The path loss is wavelength(frequency) dependent.

5. Thermal noise is generated due to
A. Lossy coupling
B. Lossless coupling
C. Lossy & Lossless coupling
D. None of the mentioned
Answer: A
Clarification: Thermal noise occurs due to the thermal motion of electrons in all conductors. It occurs due to lossy coupling between an antenna and the receiver.

6. In analog receivers, noise bandwidth is _________ signal bandwidth.
A. Lesser than
B. Greater than
C. Equal to
D. Not related
Answer: B
Clarification: With analog receivers, noise bandwidth seen by the demodulator is usually greater than the signal bandwidth.

7. The link availability measures the percentage of time the link can be ______
A. Open
B. Closed
C. Used
D. None of the mentioned
Answer: B
Clarification: Link availability is the measure of long term link utility stated on an average annual basis for a given geographical location, the link availability measures the percentage of time the link can be closed.

8. Visibility is ________ to required availability.
A. Proportional
B. Inversely proportional
C. Equal
D. Not related
Answer: B
Clarification: For a fixed link margin, visibility is inversely proportional to the required availability, and for a fixed availability visibility increases monotonically with margin.

9. The stop and wait ARQ needs _______ connection.
A. Half duplex
B. Full duplex
C. Simplex
D. None of the mentioned
Answer: A
Clarification: The stop and wait ARQ needs half duplex system since the transmitter needs ACK for each transmission.

10. In continuous ARQ will pullback uses _____ system.
A. Half duplex
B. Full duplex
C. Simplex
D. None of the mentioned
Answer: B
Clarification: The ARQ procedure called continuous ARQ with pullback requires full duplex connection.

11. Which method requires less redundancy?
A. Error detection
B. Error correction
C. Error detection & correction
D. None of the mentioned
Answer: A
Clarification: Error detection requires much simpler decoding equipment and much less redundancy than error correction.

12. Hybrid automatic repeat request is a combination of
A. ARQ and error correction code
B. ARQ and error detection code
C. Error detection and correction codes
D. One of the mentioned