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. What are the three forces acting upon a rocket during flight?

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

#3. What is the purpose of a launch lug or rail buttons?

#4. What is the primary requirement for a rocket motor ignitor?

#5. What are the three major factors that determine the maximum altitude of a high-power rocket in vertical flight?

#6. Which of the motors listed below has the highest total impulse?

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

#8. What is a Newton?

#9. What is the major issue with accelerometer-based altimeters?

#10. What is a shred?

#11. In general terms, the total impulse of a rocket motor can be described as:

#12. Rocket A weighs twice as much as rocket B. Both are descending at 20 feet per second. Which statement is true?

#13. 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?

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

#15. 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?

#16. What are three methods used to shift the center of pressure (CP) aft?

#17. What is a Cato?

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

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

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

#21. 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?

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

#23. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d)?

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

#25. Which describes the thrust curve of a regressive motor burn?