1. What is the primary function of a satellite’s attitude control system?
A. To increase the satellite's orbit speed
B. To maintain the satellite’s proper orientation in space
C. To control the satellite's power system
D. To determine the satellite's position in space
Answer: B) To maintain the satellite’s proper orientation in space
Rationale: The attitude control system (ACS) is responsible for
maintaining the satellite's orientation in space to ensure that its
sensors, antennas, or solar panels are properly oriented for their
respective functions.
2. Which of the following propulsion systems is commonly used in deep
space missions?
A. Chemical propulsion
B. Ion propulsion
,C. Electric propulsion
D. All of the above
Answer: B) Ion propulsion
Rationale: Ion propulsion systems are efficient and provide high specific
impulse, making them ideal for deep space missions where long-
duration propulsion with minimal fuel consumption is essential.
3. In satellite communications, the term "transponder" refers to which
of the following?
A. A system that receives and retransmits signals
B. A device that measures atmospheric pressure
C. A component that stores satellite telemetry data
D. A power generator for the satellite
Answer: A) A system that receives and retransmits signals
Rationale: A transponder in satellite communications is a device that
receives signals from the Earth, amplifies them, and retransmits them
back to Earth or to other satellites.
,4. Which of the following is NOT a characteristic of Low Earth Orbit
(LEO)?
A. Orbit altitude ranges from 160 km to 2,000 km
B. Short orbital periods, typically 90 to 120 minutes
C. Ideal for long-term communication with minimal signal delay
D. Ideal for Earth observation missions
Answer: C) Ideal for long-term communication with minimal signal
delay
Rationale: LEO satellites have low latency due to their proximity to
Earth, but they have shorter lifespans and are not ideal for long-term
communication as they require a large number of satellites for global
coverage.
5. What is the primary advantage of using a Geostationary Orbit
(GEO) for a communication satellite?
A. The satellite can be easily serviced from Earth
, B. The satellite remains fixed relative to a point on the Earth’s surface
C. The satellite has a very short orbital period
D. The orbit is highly elliptical, allowing for better coverage
Answer: B) The satellite remains fixed relative to a point on the Earth’s
surface
Rationale: A GEO satellite’s orbital period matches the Earth’s rotation
period, allowing the satellite to remain over the same location on Earth,
which is ideal for communication applications.
6. What is the primary role of a spacecraft's thermal control system?
A. To provide electrical power to the spacecraft
B. To regulate the spacecraft’s internal and external temperature
C. To orient the spacecraft in space
D. To monitor the spacecraft's position
Answer: B) To regulate the spacecraft’s internal and external
temperature
A. To increase the satellite's orbit speed
B. To maintain the satellite’s proper orientation in space
C. To control the satellite's power system
D. To determine the satellite's position in space
Answer: B) To maintain the satellite’s proper orientation in space
Rationale: The attitude control system (ACS) is responsible for
maintaining the satellite's orientation in space to ensure that its
sensors, antennas, or solar panels are properly oriented for their
respective functions.
2. Which of the following propulsion systems is commonly used in deep
space missions?
A. Chemical propulsion
B. Ion propulsion
,C. Electric propulsion
D. All of the above
Answer: B) Ion propulsion
Rationale: Ion propulsion systems are efficient and provide high specific
impulse, making them ideal for deep space missions where long-
duration propulsion with minimal fuel consumption is essential.
3. In satellite communications, the term "transponder" refers to which
of the following?
A. A system that receives and retransmits signals
B. A device that measures atmospheric pressure
C. A component that stores satellite telemetry data
D. A power generator for the satellite
Answer: A) A system that receives and retransmits signals
Rationale: A transponder in satellite communications is a device that
receives signals from the Earth, amplifies them, and retransmits them
back to Earth or to other satellites.
,4. Which of the following is NOT a characteristic of Low Earth Orbit
(LEO)?
A. Orbit altitude ranges from 160 km to 2,000 km
B. Short orbital periods, typically 90 to 120 minutes
C. Ideal for long-term communication with minimal signal delay
D. Ideal for Earth observation missions
Answer: C) Ideal for long-term communication with minimal signal
delay
Rationale: LEO satellites have low latency due to their proximity to
Earth, but they have shorter lifespans and are not ideal for long-term
communication as they require a large number of satellites for global
coverage.
5. What is the primary advantage of using a Geostationary Orbit
(GEO) for a communication satellite?
A. The satellite can be easily serviced from Earth
, B. The satellite remains fixed relative to a point on the Earth’s surface
C. The satellite has a very short orbital period
D. The orbit is highly elliptical, allowing for better coverage
Answer: B) The satellite remains fixed relative to a point on the Earth’s
surface
Rationale: A GEO satellite’s orbital period matches the Earth’s rotation
period, allowing the satellite to remain over the same location on Earth,
which is ideal for communication applications.
6. What is the primary role of a spacecraft's thermal control system?
A. To provide electrical power to the spacecraft
B. To regulate the spacecraft’s internal and external temperature
C. To orient the spacecraft in space
D. To monitor the spacecraft's position
Answer: B) To regulate the spacecraft’s internal and external
temperature
