# Satellite Communication Multiple-Choice Questions (MCQs)

Satellite communication is used for communicating from one place to another in Earth's orbit i.e., it is used for transporting information. Satellite communication is an artificial satellite that relays and amplifies radio telecommunication signals via a transponder.

Satellite Communication MCQs: Explore and practice these top 45 multiple-choice questions with answers on all chapters of Satellite Communication to test and enhance your knowledge of Satellite Communication.

## List of Satellite Communication MCQs

1. How many types of satellites are there based on the orbits?

1. 5
2. 4
3. 3
4. 2

Explanation:

Satellites are classified into three kinds based on their orbits: geostationary orbit (GEO), medium Earth orbit (MEO), or low Earth orbit (LEO).

2. Low earth orbit satellite travel at a height of ____ Km.

1. 160-1500 Km
2. 10000-20000 Km
3. Above 35000 Km

Explanation:

Satellites in low Earth orbit travel at a height of 160-1,500 kilometers above the Earth's surface.

3. Signals are received from a ground station, amplified, and sent back to Earth on a different frequency by a ____.

1. Footprint
2. Antenna
4. Transponder

Explanation:

Signals are received from a ground station, amplified, and sent back to Earth on a different frequency by a transponder.

4. The transfer of signals from an Earth-based ground station to a satellite is referred to as the ____ in satellite communication.

Explanation:

The transfer of signals from an Earth-based ground station to a satellite is referred to as the uplink in satellite communication.

5. Which orbital element determines the shape of the orbit and specifies how long or circular it is?

1. Semi-major axis
2. Eccentricity
3. Mean anomaly
4. Argument of perigee

Explanation:

Eccentricity determines the shape of the orbit and specifies how long or circular it is.

6. A circular orbit's eccentricity is equal to ____.

1. Infinity
2. One
3. – infinity
4. Zero

Explanation:

A circular orbit's eccentricity is equal to zero.

7. How many types of orbits are there based on the angle of inclination?

1. 5
2. 4
3. 3
4. 2

Explanation:

Based on the angle of inclination, there are four types of orbits:

• Equatorial orbit
• Polar orbit

8. What is the inclination angle of a polar orbit?

1. 180 degrees
2. 0 degrees
3. 120 degrees
4. 90 degrees

Explanation:

The inclination angle of the polar orbit is 900.

9. What is the Prograde orbit's inclination angle range?

1. The inclination angle ranges from 0 to 90 degrees
2. The inclination angle ranges from 120 to 180 degrees
3. The inclination angle ranges from 20 to 180 degrees
4. The inclination angle ranges from 180 to 360 degrees

Answer: A) The inclination angle ranges from 0 to 90 degrees.

Explanation:

The inclination angle of prograde orbit’s ranges from 0 to 90 degrees.

10. Which of the following is the correct statement?

1. The orbital radius is the distance between two satellites
2. The orbital radius is the distance between Earth's centre and the satellite
3. The orbital radius is the distance between Earth's major axis and the satellite
4. The orbital radius is the distance between the angle of inclination of the orbit and the satellite

Answer: B) The orbital radius is the distance between Earth's centre and the satellite.

Explanation:

The orbital radius is the distance between Earth's centre and the satellite.

11. What are the two parameters required to measure orbital radius?

1. Mean anomaly and angle of inclination
2. Eccentricity and mean anomaly
3. Semi-major axis and angle of inclination
4. Eccentricity and semi-major axis

Answer: D) Eccentricity and semi-major axis

Explanation:

The two parameters required to measure orbital radius are Eccentricity and semi-major axis.

12. What do you mean by orbital velocity?

1. The orbital velocity is the rate at which the satellite moves around another satellite in a fixed amount of time
2. The orbital velocity is the rate at which satellites make one complete circle around the Earth
3. The orbital velocity is the rate at which the satellite moves around another satellite
4. The orbital velocity is the rate at which the satellite moves in its orbit

Answer: D) The orbital velocity is the rate at which the satellite moves in its orbit.

Explanation:

The orbital velocity is the rate at which the satellite moves in its orbit.

13. Which of the following is the correct formula to find out the orbital velocity?

1. v = (G * M / r) ^ (1/2), Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius
2. v = (G * M / r) ^ (2), Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius:
3. v = (G * M / r) ^ (3), Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius:
4. v = (G * M / r) ^ (1/3), Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius:

Answer: A) v = (G * M / r) ^ (1/2), Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius.

Explanation:

(G * M / r) ^ (1/2) or in simple words we can write it as, v = sqrt (G * M / r),

"Where G is the gravitational constant, M is the mass of the Earth, and r is the orbital radius"

14. The ____ is the amount of time it takes the satellite to make one complete circle around the Earth.

1. Mean motion
2. Period of orbit
3. True anomaly
4. Mean anomaly

Explanation:

The period of the orbit is the amount of time it takes the satellite to make one complete circle around the Earth.

15. Which of the following phenomenon maintains the satellite traveling in a circular or elliptical direction and is directed toward the center of the orbit?

1. Atmospheric drag
3. Centripetal force
4. Gravitational force

Explanation:

The centripetal force is the force that maintains the satellite traveling in a circular or elliptical direction and is directed toward the center of the orbit.

16. Which satellite subsystem is normally comprised of solar panels that convert sunlight into electrical energy, batteries for energy storage, power management, distribution units, and so on?

1. Thermal control system
2. Power subsystem
3. Communication subsystem
4. Propulsion subsystem

Explanation:

The power subsystem is normally comprised of solar panels that convert sunlight into electrical energy, batteries for energy storage, power management, distribution units, and so on.

17. Which satellite subsystem is in charge of sending and receiving signals between the satellite and ground stations or other satellites?

1. Thermal control system
2. Command and data handling subsystem
3. Communication subsystem
4. Propulsion subsystem

Explanation:

The communication subsystem is in charge of sending and receiving signals between the satellite and ground stations or other satellites.

18. Which satellite subsystem guarantees that the internal and exterior temperatures of the satellite remain within permissible limits?

1. Thermal control system
2. Command and data handling subsystem
3. Attitude Determination and Control Subsystem (ADCS)
4. Propulsion subsystem

Explanation:

Thermal control system guarantees that the internal and exterior temperatures of the satellite remain within permissible limits.

19. Which of the following is not a component of the Attitude Determination and Control Subsystem (ADCS)?

1. Star trackers
2. Gyroscopes
3. Magnetometers
4. Cameras

Explanation:

The camera is not a component of the Attitude Determination and Control Subsystem (ADCS).

20. Which satellite subsystem offers the satellite's structure and mechanical support?

2. Command and data handling subsystem
3. Structural subsystem
4. Propulsion subsystem

Explanation:

The structural subsystem offers the satellite's structure and mechanical support.

21. Which of the following statement is True?

1. The higher the transmission latency in real-time communications, the better the communication system
2. The lower the transmission latency in real-time communications, the better the communication system

Answer: B) The lower the transmission latency in real-time communications, the better the communication system.

Explanation:

The lower the transmission latency in real-time communications, the better the communication system.

22. When compared to C-band frequencies, Ku-band signals have a ____ wavelength.

1. Shorter
2. Higher

Explanation:

When compared to C-band frequencies, Ku-band signals have a shorter wavelength.

23. Which of the following is used for direct-to-home (DTH) television broadcasts, broadband internet access, videoconferencing, and other multimedia services?

1. Ku-band
2. C band

Explanation:

Direct-to-home (DTH) television broadcasts, broadband internet access, videoconferencing, and other multimedia services are all typical uses for Ku-band.

24. Which of the following satellite launch vehicle is designed by India's Space Research Organisation (ISRO)?

1. Delta IV
2. Ariane 5
3. Soyuz
4. Polar Satellite Launch Vehicle (PSLV)

Answer: D) Polar Satellite Launch Vehicle (PSLV)

Explanation:

Polar Satellite Launch Vehicle (PSLV) is a launch vehicle designed by India's Space Research Organisation (ISRO).

25. In three axis method, which of the following axis is a fictitious line that travels horizontally through the satellite's centre?

1. Pitch axis
2. Roll axis
3. Yaw axis

Explanation:

The roll axis is a fictitious line that travels horizontally through the satellite's centre.

26. The yaw axis is an imaginary line that points outward from the satellite and travels ____ to the roll and pitch axes.

1. Horizontal
2. Vertical
3. Perpendicular

Explanation:

The yaw axis is an imaginary line that points outward from the satellite and travels perpendicular to the roll and pitch axes.

27. Which of the following does not come under the flying phases?

1. Planning phase
2. Take-off phase
3. Climb phase
4. Decision speed

Explanation:

The following are the flying phases: planning phase, takeoff phase, climb phase, cruise phase, descent phase, approach phase, and taxi phase.

28. The phase of flight in which an aircraft transitions from traveling along the ground to flying in the air is known as ____.

1. Planning phase
2. Take-off phase
3. Climb phase
4. Descent phase

Explanation:

The phase of flight in which an aircraft transitions from traveling along the ground to flying in the air is known as takeoff.

29. How many types of solar arrays are used in satellites?

1. 5
2. 4
3. 3
4. 2

Explanation:

There are two types of solar arrays that are used in satellites:

• Cylindrical solar arrays
• Rectangular solar arrays

30. How many types of antennas are there?

1. 5
2. 4
3. 3
4. 7

Explanation:

There are mainly four types of Antennas. They are:

• Wire Antennas
• Horn Antennas
• Array Antennas
• Reflector Antennas

31. Which of the following is not an example of an aperture antenna?

1. Wire Antennas
2. Horn Antennas
3. Array Antennas
4. Reflector Antennas

Explanation:

Wire antennas are not an example of aperture antenna.

32. In the microwave frequency range, which antennas are used?

1. Wire Antennas
2. Horn Antennas
3. Array Antennas
4. Reflector Antennas

Explanation:

Horn antennas are used in the microwave frequency range.

33. In satellite communication, how many different types of transponders are there?

1. 5
2. 4
3. 3
4. 2

Explanation:

Two types of transponders in satellite communication are Bent pipe transponders and Regenerative transponders.

34. Which kind of signals are suitable for regenerative transponders?

1. Digital signals
2. Wireless signals
3. Imaginary signals,

Explanation:

Regenerative Transponders are suitable for digital signals.

35. ____ service is the satellite-based delivery of television and radio programs to end customers.

1. Satellite block service
2. Satellite telecommunication service
3. Direct Broadcast Satellite (DBS) service

Explanation:

Direct Broadcast Satellite (DBS) service is the satellite-based delivery of television and radio programs to end customers.

36. Which of the following is used in DBS service?

1. Amplitude modulation
2. Frequency modulation

Explanation:

Frequency modulation is utilized in DBS service.

37. The ____ is the amount of power with which the satellite sends the signal to the receiving end.

1. Rain attenuation
2. Antenna gain
3. Transmit power
4. Atmospheric attenuation

Explanation:

The transmit power is the amount of power with which the satellite sends the signal to the receiving end.

38. Which of the following statement is True?

1. Higher antenna gains aid in enhancing the intensity of the received signal
2. Higher antenna gains aids in diminish the intensity of the received signal
3. Lower antenna gains aids in enhancing the intensity of the received signal

Answer: A) Higher antenna gains aid in enhancing the intensity of the received signal.

Explanation:

Higher antenna gain aids in enhancing the intensity of the received signal.

39. Transmission loss of how many types in satellite communication?

1. 5
2. 4
3. 2
4. 6

Explanation:

Mainly transmission losses can be categorized into 2 types.

• Constant losses
• Variable losses

40. What is the formula of Equivalent Isotropic Radiated Power (EIRP)?

1. EIRP = Transmit Power - Antenna Gain + Losses
2. EIRP = Transmit Power + Antenna Gain + Losses
3. EIRP = Transmit Power + Antenna Gain - Losses

Answer: C) EIRP = Transmit Power + Antenna Gain - Losses

Explanation:

EIRP = Transmit Power + Antenna Gain – Losses.

41. In analog satellite communication systems, ____ is extensively utilized.

1. TDMA
2. FDMA
3. CDMA

Explanation:

In analog satellite communication systems, FDMA (Frequency Division Multiple Access) is extensively utilized.

42. In digital satellite communication systems, ____ is frequently employed.

1. TDMA
2. FDMA
3. CDMA

Explanation:

In digital satellite communication systems, TDMA (Time Division Multiple Access) is frequently employed.

43. Which of the following multiple access technique involves utilizing several antenna components or beams to generate independent communication pathways for various users?

1. TDMA
2. FDMA
3. CDMA
4. SDMA

Explanation:

SDMA Spatial division multiple access technique involves utilizing several antenna components or beams to generate independent communication pathways for various users.

44. Satellite communication services are divided into how many types?

1. 4
2. 3
3. 2
4. 5

Explanation:

Satellite communication services are divided into two groups.

• One-way satellite communication connection service
• Two-way satellite communication connection service

45. GPS offers ____ positional information.

1. 1-D
2. 2-D
3. 3-D

Explanation:

GPS offers three-dimensional positional information, including latitude, longitude, and altitude.