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

#2. 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?

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

#4. A Bates grain has an essentially neutral thrust curve because:

#5. The definition of coefficient of drag (Cd) is:

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

#7. In general terms, the specific impulse of a rocket motor is:

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

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

#10. What is a Newton?

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

#12. What is NH4ClO4?

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

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

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

#16. What is a shred?

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

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

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

#20. 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?

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

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

#23. 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?

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

#25. What is a Newton?