1c651 Vol.4
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- 1.(601) Which system was National Aeronautics and Space Administration’s (NASA) attempt atballoon communications?
- A.
Echo.
- B.
Score.
- C.
Milstar.
- D.
Telstar.
- 2.(601) Which system was the first multi-national funded communications satellite positioned over the Atlantic Ocean?
- A.
Echo.
- B.
Score.
- C.
Milstar.
- D.
Telstar.
- 3.(601) Which satellite system is managed by Defense Information Systems Agency (DISA)?
- A.
Global Positioning System (GPS).
- B.
Wideband global satellite communication (SATCOM) system (WGS).
- C.
Defense Meteorological Satellite Program (DMSP).
- D.
Defense Satellite Communications System (DSCS).
- 4.(601) What satellite system uses a type of spread spectrum that repeats switching of frequencies during transmission?
- A.
Military Strategic and Tactical Relay (Milstar).
- B.
Global Positioning System (GPS).
- C.
Wideband global satellite communication (SATCOM) system (WGS).
- D.
Defense Satellite Communications System (DSCS).
- 5.(601) Which satellite system uses the government’s allocated 500 Megahertz of X-band and 1 Gigahertz of Ka-band spectrum?
- A.
Military Strategic and Tactical Relay (Milstar).
- B.
Global Positioning System (GPS).
- C.
Wideband global satellite communication (SATCOM) system (WGS).
- D.
Defense Satellite Communications System (DSCS).
- 6.(601) Which 24 satellite constellation provides navigation and timing information to military and civilian users worldwide?
- A.
Military Strategic and Tactical Relay (Milstar).
- B.
Global Positioning System (GPS).
- C.
Wideband global satellite communication (SATCOM) system (WGS).
- D.
Defense Meteorological Satellite Program (DMSP).
- 7.(601) The recurrence of global weather monitoring with the combination of day/night and dawn/dusk coverage is every
- A.
Two hours.
- B.
Four hours.
- C.
Six hours.
- D.
12 hours.
- 8.(602) Which main part of a satellite houses those systems that perform the primary mission?
- A.
Satellite bus.
- B.
Communications/payload.
- C.
Structures and mechanisms.
- D.
Telemetry, tracking, and control.
- 9.(602) Which is not part of the structures and mechanisms subsystem?
- A.
Booms used to deploy solar arrays.
- B.
Space launch vehicle’s payload fairing.
- C.
Components connecting various satellite sections together.
- D.
Equipment for separating the satellite from the launch vehicle.
- 10.(602) Which type of stress is the satellite’s structure subject to during handling and stacking sequences?
- A.
Testing.
- B.
Transport.
- C.
Pre-launch.
- D.
Manufacture.
- 11.(603) Which is a power storage component in the electrical power subsystem?
- A.
Solar arrays.
- B.
Rechargeable batteries.
- C.
Solar array drive assembly.
- D.
Radioisotope thermoelectric generators.
- 12.(603) What type of battery is used as a continuous energy source and cannot be recharged?
- A.
Primary.
- B.
Secondary.
- C.
Tertiary.
- D.
Fuel cell.
- 13.(603) What component is the heart of a fuel cell by generating electricity in the form of direct current?
- A.
Heat recovery.
- B.
Fuel cell stack.
- C.
Fuel processor.
- D.
Current inverters and conditioners.
- 14.(603) Which effect occurs when a solar cell converts sunlight into electricity?
- A.
Gyroscopic.
- B.
Photoelectric.
- C.
Thermoelectric.
- D.
Electromagnetic.
- 15.(603) What is used to protect solar cells from radiation damage?
- A.
Sun shields.
- B.
Special mirrors.
- C.
Thermal blankets.
- D.
Layers of quartz or sapphire.
- 16.(603) In what common method of solar cell construction are the solar cell edges overlapped?
- A.
Flat mounting.
- B.
Body mounting.
- C.
Paddle mounting.
- D.
Shingle mounting.
- 17.(604) Which rocket motor is simple to build, cheaper to produce, and provides additional thrust at liftoff?
- A.
Ion engine.
- B.
Gas-propellant.
- C.
Solid-propellant.
- D.
Liquid-propellant.
- 18.(604) What type of double-base-propellant has both an oxidizer and a fuel?
- A.
Composite.
- B.
Homogenous.
- C.
Heterogeneous.
- D.
Non-hygroscopic.
- 19.(604) Which is not an ideal characteristic of solid-propellants?
- A.
High density.
- B.
Hygroscopic.
- C.
Safe and easy to handle.
- D.
Smokeless and flashless.
- 20.(604) What type of liquid propellant adds a catalyst to increase the speed of reaction?
- A.
Bipropellant.
- B.
Tripropellant.
- C.
Solid propellant.
- D.
Monopropellant.
- 21.(604) Which is not an ideal characteristic of liquid-propellants?
- A.
Low freezing point (wide range of operation).
- B.
Low heat of combustion per unit of propellant mixture.
- C.
Low toxicity and corrosiveness (easy handling and storage).
- D.
Large availability of raw materials and ease of manufacture.
- 22.(604) What is a rough measure that calculates how fast a rocket can travel by how fast propellant is ejected out of the back of the rocket engine?
- A.
Specific density.
- B.
Specific impulse.
- C.
Hygroscopicity.
- D.
Ignition uniformity.
- 23.(605) What type of attitude control occurs when the interaction between the satellite and the environment produce natural stabilizing torque?
- A.
Passive control.
- B.
Spin stabilization.
- C.
Solar wind stabilization.
- D.
Active closed-loop control.
- 24.(605) What machine is a self-contained navigation system capable of determining a vehicle’s position in inertial space through the double integration of the output of accelerometers?
- A.
Gyroscope.
- B.
Axis generator.
- C.
Computer processors.
- D.
Inertial navigation unit.
- 25.(606) Which subsystem keeps a satellite within certain temperature limits?
- A.
Propulsion.
- B.
Electrical power.
- C.
Thermal control.
- D.
Telemetry, tracking, and control.
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