L2 HPR Technical Quiz

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#1. The definition of coefficient of drag (C d ) is:

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

#3. What happens to the coefficient of drag (C d ) as the rocket approaches the speed of sound?

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

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

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

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

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

#9. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?

#10. What is NH 4 ClO 4 ?

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

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

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

#14. What does the motor designation I220-8 mean?

#15. What are three methods used to shift the center of gravity (CG) of a rocket forward?

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

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

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

#19. Which of the following has a total impulse (I t ) in the J motor range?

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

#21. 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?

#22. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?

#23. What can happen if all the motors of a cluster do not ignite at launch?

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

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

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