Tripoli High Power Level 2

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Technical - 1
Which of Newton's Laws best describes the behavior of a rocket motor?
A. Newton's First Law: Every body continues in its state of rest or of uniform motion in a straight line unless it is compelled to change that state by forces impressed upon it.
B. Newton's Second Law: The rate of change of momentum is proportional to the force impressed and is in the same direction as that force.
C. Newton's Third Law: To every action there is always an equal and opposite reaction.
Technical - 7
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.
Technical - 8
What is the "rule-of-thumb" for a stable rocket?
A. That the center of gravity is one body diameter in front of the center of pressure.
B. That the center of gravity is at the same point as the center of pressure.
C. There is no rule-of-thumb because there are too many variables.
Technical - 9
When determining the center of gravity (CG) of a rocket with a heavier motor at the launch site, one can:
A. Install the motor, recovery system and payload and determine the balance point of the rocket as it is ready for flight.
B. Balance the rocket with an empty motor 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 more powerful motor because it has more thrust.
Technical - 10
What happens to the center of gravity (CG) of a rocket during a solid rocket motor's thrusting phase?
A. The Center of gravity stays the same.
B. The Center of gravity shifts forward.
C. The center of gravity shifts aft.
Technical - 17
What effect does a boat tail have on a subsonic rocket's coefficient of drag (Cd)?
A. No effect, a boat tail is only a cosmetic design feature.
B. It increases the Cd by changing the airflow over the fins.
C. It decreases the Cd by reducing the base drag.
Technical - 18
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.
Technical - 20
What is the thrust curve of a progressive motor?
A. A progressive burn has a high initial thrust relative to the ending thrust of the motor.
B. A progressive burn has a lower initial thrust relative to the ending thrust.
C. The thrust curve is flat.
Technical - 24
What is NH4ClO4?
A. Ammonium Perchlorate.
B. Ammonium Nitrate.
C. Ammonium Chlorate.
Technical - 25
A small hole is typically recommended near the top, but below the nosecone or payload section, of a high power rocket's booster section. Why?
A. This hole allows excessive ejection charge pressures to vent to reduce shock cord stress.
B. The hole is used to give air pressure readings for on-board altimeters.
C. The hole vents internal air pressure as the rocket gains altitude to prevent premature separation.
Technical - 27
What happens when changing to more or larger injector orifices in an ideal hybrid rocket motor (assume the oxidizer weight stays the same)?
A. The total impulse decreases and the average thrust increases.
B. The total impulse stays the same and the average thrust increases.
C. The total impulse stays the same and the average thrust decreases.
Technical - 28
What is the oxidizer most commonly used in a commercial hybrid rocket motor?
A. N2O
B. N2O4
C. NO2
Technical - 31
A rocket with a motor cluster consisting of a central composite motor and four black powder motors using thermalite igniters or electric matches:
A. will result in all motors starting about the same time.
B. will result in the composite motor starting first followed by the black powder motors.
C. will result in the black powder motors starting first followed by the central composite motor.
Technical - 33
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 unit weight of propellant.
C. Dependent on the diameter and length of the propellant grain.
Technical - 35
The average thrust of a rocket motor is 100 Newtons and the burn time is 4 seconds, what is the total impulse?
A. 25 Newton-seconds
B. 400 Newton-seconds
C. 400 newtons
Technical - 37
Which motor has a higher average thrust?
A. J200
B. J400
C. K200
Technical - 38
What is the difference between a J640 and a J320 high power rocket motor (assume full 1280 Newton-second J motors)?
A. The J320 burns out twice as fast as the J640.
B. There is no difference between the motors, the numbers are manufacturer reference only.
C. The J640 burns out twice as fast as the J320.
Technical - 40
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.
Technical - 41
What does the motor designation I220-8 mean?
A. The motor is in the I impulse range with an average thrust of 220 Newtons and an 8 second delay from motor ignition.
B. b. The motor is in the I impulse range, having a total impulse of 620 Newton-seconds with an average thrust of 220 Newtons and an 8 second delay from motor burn-out.
C. The motor is in the I impulse range with an average thrust of 220 Newtons and an 8 second ejection delay from motor burn-out.
Technical - 43
The equation for determining the energy of a moving body (such as a rocket) is:
A. E = 1/2 mv2
B. E = ma2
C. E = mv3
Technical - 44
What is the purpose of a launch rod, rail or tower?
A. To keep the rocket pointing in the right direction prior to flight.
B. To control the rocket's flight long enough to allow aerodynamic stability.
C. Both a and b.
Technical - 45
What is the purpose of a launch lug?
A. To add drag to the rocket at launch.
B. To guide the rocket along the launch rod or rail.
C. Both a and b.
Technical - 47
What can happen if all the motors of a cluster do not ignite at launch?
A. Nothing, the rocket is inherently stable.
B. The rocket may not fly straight.
C. The rocket will shred.
Technical - 48
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.
Technical - 50
What is the primary requirement for a rocket motor ignitor?
A. It must transfer sufficient heat to the propellant to assure ignition.
B. It must produce hot, high velocity gasses to assure ignition.
C. It must have a high resistance to be reliable.
Safety - 1
What is generally covered in the scope of NFPA 1127?
A. Design and construction of commercial high power rocket motors, high power rocket vehicles and launch operations.
B. Design and construction of all amateur high power rocket motors, high power rocket vehicles and launch operations.
C. Design and construction of model and high power rocket motors model and high power rocket vehicles and launch operations.
Safety - 7
What is a complex high power rocket?
A. A rocket having more than one stage.
B. A rocket having a cluster of rocket motors.
C. Both a and b.
Safety - 8
What are the rocket motor criteria (minimum) that defines a high power rocket?
A. A rocket with a single motor with more than 160 Newton-seconds total impulse or an installed impulse of 320 Newton-seconds and no more than 40n960 Newton-seconds.
B. A rocket with a single motor having an average thrust in excess of 80 Newtons.
C. Both a and b.
Safety - 9
What is the lower weight limit of a high power rocket?
A. A rocket weighing more than 53 ounces.
B. A rocket weighing less than 112 pounds.
C. Both a and b.
Safety - 10
When is a recovery device not necessary in a high power rocket?
A. When the high power rocket is intended for ballistic flight.
B. When the rocket has a bursting charge.
C. A recovery device is always necessary.
Safety - 17
When must the stability of a rocket be determined?
A. If the safety monitor requests it.
B. When designing a new rocket.
C. Whenever the rocket is prepared for flight.
Safety - 18
What is the maximum weight of a high power rocket?
A. Less than maximum weight recommended by the motor manufacturer for a given motor.
B. Less than 112 pounds or 50kg.
C. There is no maximum high power rocket weight.
Safety - 20
What payloads are not permitted in a high power rocket?
A. Payloads that are flammable or explosive or intended to cause harm.
B. Vertebrate animals.
C. Both a and b.
Safety - 24
When shall the motor ignitor(s) be installed in a high power rocket motor?
A. At the launcher or a designated area.
B. When the motor is installed in the rocket.
C. Neither a or b.
Safety - 25
When shall firing circuits be armed?
A. When testing ignitor continuity.
B. When the rocket is in the launching position.
C. Both a and b.
Safety - 27
What is the alternate launch site criteria?
A. No less than 1500 feet.
B. No less than one-half the maximum altitude expected or granted by the FAA.
C. Both a and b.
Safety - 28
What is the minimum distance from an occupied building or public highway for a launch site?
A. 1000 feet.
B. 1500 feet.
C. No minimum distance if the building occupants are informed of the activity.
Safety - 31
What is the limit of surface wind for launching a high power rocket?
A. 30 mph.
B. 20 mph.
C. 15mph.
Safety - 33
High power rocket motors, motor reloading kits and pyrotechnic modules shall be stored in what type of container?
A. A Type 3 or Type 4 indoor/outdoor magazine.
B. A resealable, non-combustible container.
C. Both a (depending on propellant weight) and b.
Safety - 35
What quantity of high power rocket motors, motor reloading kits and pyrotechnic modules may be stored in an indoor magazine?
A. la pounds.
B. 25 pounds.
C. 50 pounds.
Safety - 37
A commercial manufacturer of high power rocket motors may produce what kind of motors?
A. Expendable, solid propellant high power rocket motors.
B. Reloadable non-expendable solid propellant high power rocket motors.
C. All of the above.
Safety - 38
How much variation can there be in the certified total impulse and delay time of commercial high power rocket motors?
A. 10%
B. 20 %
C. 30 %
Safety - 40
What is the key prerequisite for certification of a solid propellant high power rocket motor?
A. Prior classification by the U.S. Department of Transportation as a U N Division 1.3 or 1.4 explosive or written acknowledgment of the motor or reload kit as a flammable solid.
B. Authorization for manufacture of solid propellant high power rocket motors from the Authority Having Jurisdiction.
C. Registration of the propellant formula and characteristics with the Bureau of Alcohol, Tobacco and Firearms.
Safety - 41
When must the manufacturer report changes to the authority that originally certified the certified high power rocket motor?
A. If the design results in greater than 20% deviation from the performance established at certification.
B. Within 30 days of the change.
C. No reports must be made.
Safety - 43
What is the age limit Tripoli recognizes for a certified solid propellant high power rocket motor user?
A. 21 years of age.
B. 18 years of age.
C. There is no age limit.
Safety - 44
When may a high power rocket motor be used for spectacular displays of color, light and/or sound?
A. When used in a public display.
B. When properly designed for that purpose.
C. They may not be used for this application.
Safety - 45
When is the sale, offering for sale and/or exposing for sale of uncertified motors permissible?
A. When the motors are not to be transported outside the state of manufacture.
B. When the sale of motors are limited to certified users.
C. It is never permitted.
Safety - 47
When is it permissible to consume alcohol when prepping or launching high power rockets?
A. When the preparation is done the day before the launch.
B. If the blood alcohol level is below the "impaired" level.
C. It is never permitted.
Safety - 48
What organizations may certify high power rocket motors?
A. Tripoli Rocketry Association.
B. The National Association of Rocketry.
C. Both a and b.
Safety - 50
What document has been adopted by the Tripoli Rocketry Association as the Tripoli Safety Code?
A. NFPA 1127
B. NFPA 1125
C. NFPA 1122