HPR Level 2 Technical Questions
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. What is the purpose of a launch rod, rail or tower?
#3. A small hole is typically drilled near the top of a high-power rocket’s airframe, below the nosecone or payload section. Why?
#4. What is the “rule-of-thumb” for a stable rocket?
#5. Which of the following is most likely in dual-deployment rockets that use a drogue and a main parachute?
#6. What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound?
#8. Which of the following has a total impulse (It) in the J motor range?
#9. 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?
#10. The center of pressure (CP) of a rocket is generally defined as:
#11. Which describes the thrust curve of a regressive motor burn?
#12. How does Newton’s Third Law “To every action there is always an equal and opposite reaction” relate to rocketry?
#13. What is the purpose of a launch lug or rail buttons?
#14. How can a statically unstable rocket be made stable?
#15. The flight of a high-power rocket can be separated into three portions; they are:
#16. Which describes the thrust curve of a progressive motor?
#17. What are the three forces acting upon a rocket during flight?
#18. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d)?
#20. In general terms, the specific impulse of a rocket motor is:
#21. The definition of coefficient of drag (Cd) is:
#22. You are at the launch site and decide to fly your rocket on a heavier motor than you simulated it on. Which statement regarding CG is true?
#23. What does the motor designation I220-8 mean?
#24. 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?
#25. What effect does a boat tail have on a subsonic rocket’s coefficient of drag (C d)?
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