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.

Your quiz will then be automatically marked. Pass mark is 90%.

Correct answers will be highlighted in green and incorrect answers will be highlighted in pink.

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#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?