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.
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#1. What ordinarily happens to the center of gravity (CG) of a rocket during a solid rocket motor’s thrusting phase?
#2. What are the three major factors that determine the maximum altitude of a high-power rocket in vertical flight?
#3. What does the motor designation I220-8 mean?
#4. The definition of coefficient of drag (Cd) is:
#5. 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?
#6. A Bates grain has an essentially neutral thrust curve because:
#7. Which of the motors listed below has the highest average thrust?
#8. What happens to the coefficient of drag (Cd) as the rocket approaches the speed of sound?
#9. Which of Newton’s Laws best describes the behavior of a rocket motor?
#10. A rocket with a motor cluster consisting of a central composite motor and four black powder motors, using five identical igniters:
#11. 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?
#12. How can a statically unstable rocket be made stable?
#13. Most APCP (ammonium perchlorate composite propellant) rocket motors are central- burning rather than end-burning:
#14. What effect does a boat tail have on a subsonic rocket’s coefficient of drag (C d)?
#15. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?
#16. The flight of a high-power rocket can be separated into three portions; they are:
#17. 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?
#18. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d)?
#19. Which of the motors listed below has the highest total impulse?
#20. What are the three forces acting upon a rocket during flight?
#21. What is the purpose of a launch lug or rail buttons?
#22. What is the major issue with accelerometer-based altimeters?
#24. What typically happens to a marginally stable rocket with a hybrid motor during the thrusting phase?
#25. What is the primary requirement for a rocket motor ignitor?
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