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#1. The flight of a high power rocket can be separated into three portions; they are:
a. Ignition, burnout and peak altitude.
b. Powered flight, un-powered ascent and peak altitude.
c. Powered flight, un-powered ascent and descent. #2. What are the three major factors that determine the maximum altitude of a high power rocket in vertical flight?
a. Lift-off weight, propellant weight and motor thrust.
b. Fin size, propellant weight and motor thrust.
c. Motor thrust, rocket weight, and aerodynamic drag. #3. A Bates grain has an essentially neutral thrust curve because:
a. Core burning motors always have a neutral thrust curve.
b. The area of burning propellant remains relatively constant.
c. The core is centered in the propellant grain. #4. What is a shred?
a. A failure of the rocket air frame during boost resulting in destruction of the rocket.
b. A failure of the recovery system during boost.
c. A failure of the motor causing early ejection. #5. 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?
a. The two rockets have the same kinetic energy.
b. Rocket B has twice the kinetic energy of rocket A.
c. Rocket B has four times the kinetic energy of rocket A. #6. How can a statically unstable rocket be made stable?
a. Using a heavier motor.
b. Adding weight to the nose.
c. Making the rocket shorter. #7. Which describes the thrust curve of a progressive motor?
a. A general decrease in thrust during the burn.
b. A general increase in thrust during the burn.
c. About the same thrust at ignition as at burnout. #8. The center of pressure (CP) of a rocket is generally defined as:
a. The balance point of the rocket without the motor.
b. The total area of the fins, airframe and nose cone divided by two.
c. The point at which aerodynamic lift on a rocket is centered. #9. Which describes the thrust curve of a regressive motor burn?
a. A high initial thrust relative to the ending thrust of the motor.
b. A lower initial thrust relative to the ending thrust.
c. The thrust curve is flat. #10. How do you convert Newtons of thrust to pounds of thrust?
a. Add 4.45 to the number of Newtons
b. Multiply Newtons by 4.45
c. Divide Newtons by 4.45 #11. The definition of coefficient of drag (C d ) is:
a. A dimensionless number that represents the effect of gravity and Mach number of the rocket.
b. A dimensionless number dependent on the rocket configuration, Mach number and angle of attack.
c. The force, in Newtons, exerted on the rocket by the atmosphere. #12. What is the oxidizer most commonly used in a commercial hybrid rocket motor?
a. N 2 O
b. N 2 O 4
c. NO 2 #13. What does the motor designation I220-8 mean?
a. The motor has between 320-640 N-s of impulse, an average thrust of 220 Newtons, with approximately 8 seconds between motor ignition and ejection.
b. The motor has 220 N-s of impulse, an average thrust of 220 Newtons, with 8 seconds between motor burn-out and ejection.
c. The motor has between 320-640 N-s of impulse, an average thrust of 220 Newtons, with approximately 8 seconds between motor burn-out and ejection. #14. For a subsonic rocket, what factors most greatly affect the coefficient of drag (C d )?
a. Motor thrust, body diameter, nosecone shape and fin shape.
b. Speed, airframe dimensions, nosecone shape and fin shape.
c. Gravity, airframe dimensions, nosecone shape and fin shape . #15. What is the most common oxidizer in commercially available high power composite solid rocket motors?
a. Ammonium Perchlorate
b. Ammonium Nitrate
c. Ammonium Chlorate #16. Which of the motors listed below has the highest total impulse? #17. For a cluster rocket, which construction technique will minimize the effect of one motor failing to ignite?
a. Make the holes in the forward centering ring slightly closer to the rocket’s centerline than those of the aft centering ring.
b. Space the centering rings precisely one motor length apart.
c. Use four smaller fins instead of three larger fins. #18. 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?
a. One can install the motor, recovery system and payload and determine the balance point of the rocket as it is ready for flight.
b. One can balance the rocket with the motor hardware alone because that is the condition of the rocket after motor burnout.
c. It is not necessary to test for the center of gravity when using a heavier motor because it has more thrust. #19. When using a pressure-sensor altimeter in a rocket that will not reach Mach 1:
a. One or more access holes must be drilled at the base of the nose cone to permit access to the atmosphere during flight.
b. A timer, but not a motor delay, may be used as backup for deployment.
c. One or more holes must be drilled in the electronics bay for atmospheric access. #20. What is a Newton?
a. The amount of force required to accelerate one pound one foot per second per second.
b. The amount of force required to accelerate one kg one foot per second per second.
c. The amount of force required to accelerate one kg one meter per second per second. #21. Which of the following is most likely in dual-deployment rockets that use a drogue and a main parachute?
a. The drogue and the main can tangle if not properly arranged.
b. The drogue slows the rocket too much and it drifts too far.
c. The drogue does not slow the rocket enough and it lands hard. #22. Most APCP (ammonium perchlorate composite propellant) rocket motors are central-burning rather than endburning:
a. Because most APCP has a specific impulse that is too low for endburning motors.
b. Because most APCP has a burn rate that is too low for useful endburners.
c. The premise is incorrect; most APCP motors ARE endburners. #23. In general terms, the specific impulse of a rocket motor is:
a. The total thrust force of a motor throughout its action time.
b. The total impulse divided by a unit weight of propellant.
c. Inversely related to the diameter and length of the propellant grain. #24. For an inherently stable rocket, which statement about the center of gravity (CG) and the center of pressure (CP) is true?
a. The CG must be behind the CP relative to the desired direction of flight.
b. The CG must be forward of the CP relative to the desired direction of flight.
c. The CG must move forward (in the desired direction of flight) during the motor burn. #25. What are the three forces acting upon a rocket during flight?
a. Thrust, rocket diameter and finish.
b. Nose cone shape, thrust and drag.
c. Gravity, thrust and aerodynamic drag.