Question 27 (0.5 points) What is the main advantage of liquid rocket propellant

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Question 27 (0.5 points)

What is the main advantage of liquid rocket propellant engines versus solid rocket propellant engines?

Question 27 options:

a.Their propellant is easier to store

b. They can be throttled, stopped, and restarted

c. They require a more complex engine

d. They are cryogenized

Question 28 (0.5 points)

The “Curiosity” rover that landed on the Martian surface in August 2012:

Question 28 options:

a. Uses the same Entry-Descend and Landing system as Mars Pathfinder

b. is about the size of a child wagon

c. Is powered by a radioisotope thermoelectric generator

d. Landed at Gusev Crater

Question 29 (0.5 points)

What kind of trajectory was used by Cassini spacecraft?

Question 29 options:

a. Type I trajectory

b. VVEJGA trajectory

c. VEEGA trajectory

d. None of the above

Question 30 (0.5 points)

What is/are the main disadvantage(s) of LEO satellite systems?

Question 30 options:

a. Higher costs to build deploy, and operate

b. higher look angle than GEO systems

c. Low latency

d. All of the above

a.Their propellant is easier to store

b. They can be throttled, stopped, and restarted

c. They require a more complex engine

d. They are cryogenized

Explanation / Answer

27) Option B is correct.Liquid rockets propellent engines have higher specific impulse than solid rockets. They are capable of being throttled, shut down, and restarted.

28)Option C is correct.The Radioisotope Thermoelectric Generator, an energy source that relies on the heat generated by decaying plutonium dioxide is used to run Curiosity.

29)Option B is correct.The cassini spacecraft used the VVEJGA (Venus-Venus-Earth-Jupiter Gravity Assist) trajectory to reach at Saturn.

30)option C is correct.Low earth orbit (LEO) has least propagation delay (about 10ms) compare to other orbits due to closeness to the Earth. Due to lower latency, it can be used for realtime time critical applications.

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