This is the Multiple Choice Questions in Chapter 17: Terrestrial Microwave Communication Systems from the book Electronic Communication Systems by Roy Blake
See also: MCQ in Electronic Communication Systems by George Kennedy
Start Practice Exam Test Questions
Choose the letter of the best answer in each questions.
MULTIPLE CHOICE
1. Another term for a single microwave link is a:
a. section
b. hop
c. skip
d. jump
Answer: Option B
Solution:
2. Microwave systems use:
a. FM
b. SSB
c. QAM
d. all of the above
Answer: Option D
Solution:
3. The typical reliability of a microwave system is:
a. 90%
b. 99%
c. 99.9%
d. 99.99%
Answer: Option D
Solution:
4. A typical microwave system uses a transmitted power of about:
a. 2 watts
b. 20 watts
c. 200 watts
d. none of the above
Answer: Option A
Solution:
5. In analog microwave systems, additional repeaters increase the:
a. reliability
b. noise level
c. jitter
d. all of the above
Answer: Option B
Solution:
6. In digital microwave systems, additional repeaters increase the:
a. reliability
b. noise level
c. jitter
d. all of the above
Answer: Option C
Solution:
7. LOS stands for:
a. Loss Of Skip
b. Loss Of Signal
c. Line-Of-Sight
d. Line-Of-Signal
Answer: Option C
Solution:
8. Too much antenna gain causes:
a. a very narrow microwave beam
b. a very wide microwave beam
c. excessive noise
d. jitter
Answer: Option A
Solution:
9. The microwave signal path should clear obstacles by at least:
a. 60% of the Faraday zone
b. 60% of the Fresnel zone
c. 60% of the height of the antenna tower
d. 60% of the highest obstacle height
Answer: Option B
Solution:
10. Satisfactory performance of an analog microwave system is defined as:
a. a carrier-to-noise ratio that exceeds a given value
b. an ERP level that exceeds a given value
c. an energy-per-hertz level that exceeds a given value
d. none of the above
Answer: Option A
Solution:
11. Satisfactory performance of a digital microwave system requires a:
a. low level of transmitted power
b. high level of ERP
c. good energy per bit per transmitted Watt ratio
d. good energy per bit per noise density ratio
Answer: Option D
Solution:
12. Fading is caused by:
a. multipath reception
b. attenuation due to weather
c. ducting
d. all of the above
Answer: Option D
Solution:
13. The effects of fading due to multipath reception are often reduced using:
a. diversity
b. power
c. high-gain antennas
d. all of the above
Answer: Option A
Solution:
14. Repeaters are used in a microwave system:
a. always
b. when distance exceeds line-of-sight
c. above 10 GHz
d. below 10 GHz
Answer: Option B
Solution:
15. Microwave repeaters can be:
a. IF type
b. baseband type
c. regenerative type
d. all of the above
Answer: Option D
Solution:
16. An advantage of digital techniques over analog in a microwave system is:
a. less bandwidth is required
b. accumulation of noise is reduced
c. it requires less power
d. all of the above
Answer: Option B
Solution:
17. MMDS stands for:
a. Multichannel Microwave Distribution System
b. Multipoint Microwave Distribution System
c. Multichannel Multipoint Distribution System
d. Multiple Microwave Distribution Systems
Answer: Option C
Solution:
18. LMDS stands for:
a. Local Microwave Distribution System
b. Local Multipoint Distribution System
c. Local Multichannel Distribution System
d. Low-power Microwave Distribution System
Answer: Option B
Solution:
19. LMDS is:
a. bidirectional
b. unidirectional
c. multidirectional
d. none of the above
Answer: Option A
Solution:
COMPLETION
1. One microwave link is called a ____________________.
Answer: hop
Solution:
2. STL stands for ____________________-to-transmitter links.
Answer: studio
Solution:
3. A typical microwave system has about one hour per ____________________ or less of downtime.
Answer: year
Solution:
4. Adding more links causes ____________________ in a digital microwave system.
Answer: jitter
Solution:
5. In microwave systems, it is more convenient to use noise ____________________ than noise figure in calculations.
Answer: temperature
Solution:
6. In digital microwave systems, the energy per bit per ____________________ is a key parameter.
Answer: noise density
Solution:
7. Multipath reception can cause 20 dB or more of ____________________.
Answer: fading
Solution:
8. Two antennas stacked one above the other on a tower is an example of ____________________ diversity in a microwave system.
Answer: space
Solution:
9. The ability to use two frequencies simultaneously is an example of ____________________.
Answer: diversity
Solution:
10. Microwave systems generally use less than ____________________ watts of power.
Answer: ten
Solution:
11. ____________________ are necessary in a microwave system that extends beyond the line-of-sight distance.
Answer: Repeaters
Solution:
12. Analog microwave systems use both IF and ____________________ repeaters.
Answer: baseband
Solution:
13. Microwave digital radio techniques reduce the accumulation of ____________________ as a signal goes from link to link.
Answer: noise
Solution:
14. MMDS is unidirectional, but ____________________ is bidirectional.
Answer: LMDS
Solution:
SHORT ANSWER
1. If the line-of-sight distance for an optical beam is 12 km, what would it be, approximately, for a microwave beam?
Answer: 16 km
Solution:
2. A line-of-sight microwave link operating at 4 GHz has a separation of 40 km between antennas. An obstacle in the path is located midway between the two antennas. By how much must the beam clear the obstacle?
Answer: 16.4 meters
Solution:
3. A transmitter and receiver operating at 1 GHz are separated by 10 km. How many dBm of power gets to the receiver if the transmitter puts out 1 Watt, and both the sending and receiving antennas have a gain of 20 dBi?
Answer: -42.4 dBm
Solution:
ANS:
4. A microwave system has a feed-line loss of 2 dB and sees a sky temperature of 150 K. Calculate the noise temperature of the antenna/feed-line system referenced to the receiver input.
Answer: 201 K
Solution:
5. A microwave receiver receives –60 dBm of signal. The noise power is –100 dBm. What is the carrier-to-noise power ratio?
Answer: 40 dB
Solution:
Complete List of MCQ in Electronic Communication Systems by Blake
Related Content
P inoyBIX educates thousands of reviewers and students a day in preparation for their board examinations. Also provides professionals with materials for their lectures and practice exams. Help me go forward with the same spirit.
“Will you subscribe today via YOUTUBE?”
TIRED OF ADS?
- Become Premium Member and experienced complete ads-free content browsing.
- Full Content Access to Premium Solutions Exclusive for Premium members
- Access to PINOYBIX FREEBIES folder
- Download Reviewers and Learning Materials Free
- Download Content: You can see download/print button at the bottom of each post.
PINOYBIX FREEBIES FOR PREMIUM MEMBERSHIP:
- CIVIL ENGINEERING REVIEWER
- CIVIL SERVICE EXAM REVIEWER
- CRIMINOLOGY REVIEWER
- ELECTRONICS ENGINEERING REVIEWER (ECE/ECT)
- ELECTRICAL ENGINEERING & RME REVIEWER
- FIRE OFFICER EXAMINATION REVIEWER
- LET REVIEWER
- MASTER PLUMBER REVIEWER
- MECHANICAL ENGINEERING REVIEWER
- NAPOLCOM REVIEWER
- Additional upload reviewers and learning materials are also FREE
FOR A LIMITED TIME
If you subscribe for PREMIUM today!
You will receive an additional 1 month of Premium Membership FREE.
For Bronze Membership an additional 2 months of Premium Membership FREE.
For Silver Membership an additional 3 months of Premium Membership FREE.
For Gold Membership an additional 5 months of Premium Membership FREE.
Join the PinoyBIX community.
