1. What is the primary function of a VSAT (Very Small Aperture Terminal) system?
a) Long-distance communication
b) Satellite imaging
c) Broadband internet access
d) Weather forecasting
Answer: c) Broadband internet access
Explanation: VSAT systems are primarily designed to provide broadband internet access to remote locations via satellite communication.
2. Which term describes the size of the aperture in a VSAT terminal?
a) Large Aperture Terminal (LAT)
b) Very Small Aperture Terminal (VSAT)
c) Medium Aperture Terminal (MAT)
d) Ultra Small Aperture Terminal (USAT)
Answer: b) Very Small Aperture Terminal (VSAT)
Explanation: The term “Very Small Aperture Terminal” (VSAT) refers to the small size of the satellite dish used in these systems.
3. What is the typical architecture of a VSAT network?
a) Mesh
b) Star
c) Hybrid
d) Ring
Answer: b) Star
Explanation: In a star network architecture, all VSAT terminals communicate directly with a central hub station.
4. Which protocol is commonly used for access control in VSAT systems?
a) TCP/IP
b) FTP
c) TDMA
d) SMTP
Answer: c) TDMA (Time Division Multiple Access)
Explanation: TDMA is a common access control protocol used in VSAT systems, allowing multiple terminals to share the same satellite channel by dividing time into slots.
5. What is the purpose of calculating link margins in a VSAT star network?
a) To optimize satellite orbit
b) To ensure signal quality and reliability
c) To reduce latency
d) To conserve bandwidth
Answer: b) To ensure signal quality and reliability
Explanation: Link margins are calculated to ensure that the received signal strength at each VSAT terminal is sufficient to maintain reliable communication, considering factors like atmospheric attenuation and system noise.
6. What is the primary function of Direct Broadcast Satellite (DBS) television and radio?
a) Provide weather forecasts
b) Transmit digital signals to a satellite dish for television and radio reception
c) Track satellite movements
d) Communicate with astronauts on the International Space Station
Answer: b) Transmit digital signals to a satellite dish for television and radio reception
Explanation: DBS television and radio systems deliver digital signals directly to a user’s satellite dish for television and radio reception at home.
7. Which design aspect is crucial in the link budget for a DBS TV system?
a) Antenna color
b) Receiver location
c) Satellite altitude
d) Signal strength
Answer: d) Signal strength
Explanation: The link budget for a DBS TV system involves calculating the signal strength at the receiver, considering factors like transmission power, antenna gain, and path loss.
8. How is error control typically managed in digital DBS-TV systems?
a) Through encryption
b) Through error correction codes
c) Through modulation
d) Through frequency hopping
Answer: b) Through error correction codes
Explanation: Error correction codes are used in digital DBS-TV systems to detect and correct errors introduced during transmission, ensuring high-quality reception.
9. What is a crucial step in the installation of DBS-TV antennas?
a) Aligning the antenna with the nearest cellular tower
b) Painting the antenna to match the roof color
c) Ensuring proper line-of-sight to the satellite
d) Connecting the antenna to a landline telephone
Answer: c) Ensuring proper line-of-sight to the satellite
Explanation: Proper alignment of the DBS-TV antenna is crucial to establish a clear line-of-sight to the satellite, ensuring optimal signal reception.
10. What is the primary focus of satellite radio broadcasting?
a) Transmitting visual content
b) Providing on-demand video streaming
c) Delivering audio content to receivers on Earth
d) Facilitating two-way communication between users
Answer: c) Delivering audio content to receivers on Earth
Explanation: Satellite radio broadcasting primarily focuses on delivering audio content, such as music, news, and talk shows, to receivers on Earth via satellite transmission.