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# Blake: MCQ in Satellite Communications

This is the Multiple Choice Questions in Chapter 20: Satellite Communications 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. The height of the geosynchronous orbit above the equator is about:

a. 3,578 km

b. 35,780 km

c. 357,800 km

d. depends on satellite velocity

Solution:

2. The high and low points of a satellite’s orbit are called, respectively,:

a. apogee and perigee

b. perigee and apogee

Solution:

3. The area on the earth that is “covered” by a satellite is called its:

a. earth station

c. footprint

d. plate

Solution:

4. The velocity required to stay in orbit:

a. is constant

b. is zero (freefall)

c. is lower close to the earth than far from the earth

d. is higher close to the earth than far from the earth

Solution:

5. An antenna is aimed by adjusting the two “look angles” called:

a. azimuth and elevation

b. azimuth and declination

c. declination and elevation

d. apogee and perigee

Solution:

6. The power per transponder of a typical Ku-band satellite is in the range:

a. 5 to 25 watts

b. 50 to 250 watts

c. 500 to 2500 watts

d. depends on its orbit

Solution:

7. The power level for an earth station to transmit to a satellite is on the order of:

a. 101 watts

b. 102 watts

c. 103 watts

d. 104 watts

Solution:

8. The “payload” on a communications satellite consists of:

a. transponders

b. batteries

c. solar cells

d. all of the above

Solution:

9. “Station-keeping” refers to:

a. antenna maintenance

d. none of the above

Solution:

10. DBS stands for:

a. decibels of signal

b. down-beam signal

Solution:

11. LNA stands for:

a. low-noise amplifier

b. low north angle

c. low-noise amplitude

d. low-noise array

Solution:

12. A reduction in TWT power for linearity is called:

a. backdown

b. backoff

c. power-down

d. EIRP drop

Solution:

13. TVRO stands for:

b. television repeater only

c. television remote origin

d. none of the above

Solution:

14. TDMA stands for:

a. transponder-directed multiple antennas

b. television distribution master antenna

c. time-division multiple access

d. transmit delay minimum aperture

Solution:

15. VSAT stands for:

a. video satellite

b. video signal antenna terminal

c. very small antenna terminal

d. very small aperture terminal

Solution:

16. On the uplink from a terminal, a VSAT system uses:

a. high power to a small antenna

b. low power to a small antenna

c. low power to a large antenna

d. LEO satellites

Solution:

17. A typical VSAT system is configured as a:

a. star

b. mesh

c. ring

d. repeater

Solution:

18. LEO stands for:

a. long elliptic orbit

b. low-earth orbit

c. lateral earth orbit

d. longitudinal earth orbit

Solution:

19. For real-time communication, LEO systems require:

a. a constellation of satellites

b. tracking dish antennas

c. very high power

d. all of the above

Solution:

20. The frequency bands used by Ku-band satellites are:

a. 4 GHz and 6 GHz

b. 12 GHz and 14 GHz

c. 20 GHz and 30 GHz

d. none of the above

Solution:

COMPLETION

1. A satellite in geosynchronous orbit takes ____________________ hours to complete one orbit.

Solution:

2. The ____________________ is the signal path from the earth station to the satellite.

Solution:

3. The ____________________ is the signal path from the satellite to the earth station.

Solution:

4. A satellite in a ____________________ orbit appears to stay directly above one spot on the equator.

Solution:

5. Non-geostationary satellites are sometimes called ____________________ satellites.

Solution:

6. A geosynchronous orbit is about ____________________ km above the earth.

Solution:

7. A ____________________ is an outline of the area on the earth’s surface that a satellite broadcasts to.

Solution:

8. All satellite orbits are ____________________ in shape.

Solution:

9. The ____________________ is the distance of a satellite’s closest approach to the earth.

Solution:

10. The ____________________ is a satellite’s farthest distance from the earth.

Solution:

11. An antenna’s ____________________ is its angular direction between east and west.

Solution:

12. An antenna’s ____________________ is its vertical angle with respect to the earth’s surface.

Solution:

13. An antenna’s ____________________ is the angle by which it is offset from the earth’s axis.

Solution:

14. Satellites using the ____________________ band operate on 12 GHz.

Solution:

15. The time for a signal to make a round trip via satellite is about ____________________ milliseconds.

Solution:

16. A ____________________ is a type of repeater used on communications satellites.

Solution:

17. Both the gain and the beamwidth of a dish antenna depend on its ____________________.

Solution:

18. VSAT systems commonly use a ____________________ network configuration.

Solution:

19. To date, LEO satellite systems have been a financial ____________________.

Solution:

20. C-band antennas are ____________________ than Ku-band antennas.

Solution:

1. A receiving antenna with a gain of 44.4 dBi looks at a sky with a noise temperature of 15 K. The loss between the output of the antenna and the input of the LNA is 0.4 dB, and the LNA has a noise temperature of 40 K. Calculate the G/T.

Solution:

2. A receiver has a noise figure of 1.7 dB. Find its equivalent noise temperature.

Solution:

3. A receiving antenna with a G/T of 25 dB is used to receive signals from a satellite 38,000 km away. The satellite has a 100-watt transmitter and an antenna with a gain of 30 dBi. The signal has a bandwidth of 1 MHz at a frequency of 12 GHz. Calculate the C/N at the receiver.

Solution:

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

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