L2 HPR Technical Quiz

The quiz includes a random selection of 25 questions. Answer each of the questions and then click on the FINISH button at the bottom of the quiz.

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Results

#1. A 4" diameter rocket with its motor is determined to have the center of gravity (CG) four inches behind the center of pressure (CP). Is this a rocket likely to be stable?

#2. Which describes the thrust curve of a progressive motor?

#3. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?

#4. Rocket A is descending at 10 feet per second, rocket B weighs the same but is descending at 20 feet per second. Which statement is true?

#5. What is the oxidizer most commonly used in a commercial hybrid rocket motor?

#6. For a rocket with a much less than 10:1 “length to diameter” (L/D) ratio, such as spools and pyramids, what type of drag contributes significantly to stability and makes it possible to fly without much, if any, nose weight?

#7. The flight of a high-power rocket can be separated into three portions; they are:

#8. Which of Newton’s Laws best describes the behavior of a rocket motor?

#9. What is the most common function of a motor liner and the O-ring seals in a solid rocket motor?

#10. What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?

#11. How does Newton’s Third Law “To every action there is always an equal and opposite reaction” relate to rocketry?

#12. When doing an air-start of an L class motor, which of the following would be considered the safest configuration?

#13. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?

#14. Most APCP (ammonium perchlorate composite propellant) rocket motors are central- burning rather than end-burning:

#15. What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor’s thrusting phase?

#16. Which of the following has a total impulse (It) in the J motor range?

#17. How do you convert Newtons of thrust to pounds of thrust?

#18. How can a statically unstable rocket be made stable?

#19. When using a pressure-sensor altimeter in a rocket that will not reach Mach 1:

#20. What is a shred?

#21. The center of pressure (CP) of a rocket is generally defined as:

#22. What is the most common oxidizer in commercially available high power composite solid rocket motors?

#23. The average thrust of a rocket motor is 100 Newtons, and the burn time is 4 seconds. What is the total impulse?

#24. What is NH4ClO4?

#25. Which of the motors listed below has the highest average thrust?

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