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# Blake: MCQ in Terrestrial Microwave Communication Systems

This is the Multiple Choice Questions in Chapter 17: Terrestrial Microwave Communication Systems from the book Electronic Communication Systems by Roy Blake. If you are looking for a reviewer in Communications Engineering this will definitely help. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Make sure to familiarize each and every questions to increase the chance of passing the ECE Board Exam.

#### 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

Solution:

2. Microwave systems use:

a. FM

b. SSB

c. QAM

d. all of the above

Solution:

3. The typical reliability of a microwave system is:

a. 90%

b. 99%

c. 99.9%

d. 99.99%

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

Solution:

5. In analog microwave systems, additional repeaters increase the:

a. reliability

b. noise level

c. jitter

d. all of the above

Solution:

6. In digital microwave systems, additional repeaters increase the:

a. reliability

b. noise level

c. jitter

d. all of the above

Solution:

7. LOS stands for:

a. Loss Of Skip

b. Loss Of Signal

c. Line-Of-Sight

d. Line-Of-Signal

Solution:

8. Too much antenna gain causes:

a. a very narrow microwave beam

b. a very wide microwave beam

c. excessive noise

d. jitter

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

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

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

Solution:

a. multipath reception

b. attenuation due to weather

c. ducting

d. all of the above

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

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

Solution:

15. Microwave repeaters can be:

a. IF type

b. baseband type

c. regenerative type

d. all of the above

Solution:

a. less bandwidth is required

b. accumulation of noise is reduced

c. it requires less power

d. all of the above

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

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

Solution:

19. LMDS is:

a. bidirectional

b. unidirectional

c. multidirectional

d. none of the above

Solution:

COMPLETION

1. One microwave link is called a ____________________.

Solution:

2. STL stands for ____________________-to-transmitter links.

Solution:

3. A typical microwave system has about one hour per ____________________ or less of downtime.

Solution:

Solution:

5. In microwave systems, it is more convenient to use noise ____________________ than noise figure in calculations.

Solution:

6. In digital microwave systems, the energy per bit per ____________________ is a key parameter.

Solution:

7. Multipath reception can cause 20 dB or more of ____________________.

Solution:

8. Two antennas stacked one above the other on a tower is an example of ____________________ diversity in a microwave system.

Solution:

9. The ability to use two frequencies simultaneously is an example of ____________________.

Solution:

10. Microwave systems generally use less than ____________________ watts of power.

Solution:

11. ____________________ are necessary in a microwave system that extends beyond the line-of-sight distance.

Solution:

12. Analog microwave systems use both IF and ____________________ repeaters.

Solution:

13. Microwave digital radio techniques reduce the accumulation of ____________________ as a signal goes from link to link.

Solution:

14. MMDS is unidirectional, but ____________________ is bidirectional.

Solution:

1. If the line-of-sight distance for an optical beam is 12 km, what would it be, approximately, for a microwave beam?

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?

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?

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.

Solution:

5. A microwave receiver receives โ60 dBm of signal. The noise power is โ100 dBm. What is the carrier-to-noise power ratio?

Solution:

### Complete List of MCQ in Electronic Communication Systems by Blake

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