NAR HPR Level 2 Certification Practice Exam
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Question A1
Which of the following National Fire Protection Association standards provides a code for high power rocketry?
A. NFPA 1124
B. NFPA 1125
C. NFPA 1127
D. NFPA 1122
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Question A3
What is the maximum launch weight allowable for a rocket which does not require a FAA Certificate of Waiver or Authorization (COA)?
A. 4 ounces (113 grams)
B. 3.3 pounds (1500 grams)
C. 1 pound (453 grams)
D. 4.4 ounces (125 grams)
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Question A9
Which of the following characteristics does NOT meet the definition of a High Power Rocket Motor?
A. Average thrust greater than 80 Newtons
B. Total impulse is more than 160 Newton-seconds
C. The motor uses a "composite" propellant
D. Propellant weight greater than 125 grams
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Question A12
A person shall fly a high power rocket only in compliance with:
A. NFPA 1127
B. Federal Aviation Administration Regulations, Part 101
C. Federal, state, and local laws, rules, regulations, statutes, and ordinances
D. All of the above
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Question A13
Which of the following statements is always true concerning the definition of a hybrid rocket motor?
A. The fuel component is composed of either paper or plastic
B. The fuel is in a different physical state (solid, liquid, or gaseous) than the oxidizer
C. The oxidizer component is nitrous oxide
D. Both "A" and "C" above.
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Question A16
Which of the following statements are true concerning the definition of a High Power Rocket Motor?
A. Total impulse is less than 81,920 Newton-seconds
B. The total impulse is more than 160 Newton-seconds
C. The motor must use either fiberglass or metal case materials
D. Both A and B above
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Question A17
Which of the following (hypothetical) rocket motors is NOT a High Power Rocket Motor?
A. An F90 with 40 grams of propellant
B. An H60 with 62 grams of propellant
C. A G35 with 66 grams of propellant
D. All of the above are High Power Rocket Motors
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Question A18
What information does FAA FAR 101.29(a) require you to provide when filing for FAA Launch Authorization?
A. Estimated number of rockets and type of propulsion (liquid or solid), fuel(s) and oxidizer(s)
B. Description of the launcher(s) planned to be used, including any airborne platform(s) and description of recovery system
C. Highest altitude, above ground level, expected to be reached, launch site latitude, longitude, and elevation, and any additional safety procedures that will be followed
D. All of the above
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Question A20
According to NFPA 1127, a High Power Rocket shall only be launched if:
A. It contains any combination of motors having 40,960 Newton-secondsof total impulse or less
B. It contains a recovery system that is designed to return all parts to the ground intact and at a landing speed which the rocket does not present a hazard
C. It utilizes an electronically actuated recovery system as either a primary or backup deployment method if the installed total impulse is greater than 2560 Newton-seconds
D. All of the above
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Question A22
According to NFPA 1127, the definition of a High Power Rocket is a rocket vehicle that:
A. Is propelled by one or more High Power Rocket motors
B. Is propelled by a combination of model rocket motors having an installed total impulse of more than 320 Newton-seconds or a combination of model rocket motors having more than a total of 125 grams (4.4 ounces) of propellant weight
C. Weighs more than 1500 grams (53 ounces or 3.3 pounds) with motor(s) installed
D. All of the above
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Question B1
What does the "H" in the motor designation H100-5 stand for?
A. It indicates that the motor uses black powder as a propellant
B. It indicates the total power range or impulse range of the rocket motor
C. It indicates the total thrust of the rocket motor
D. It is the first letter in the manufacturer's name
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Question B4
What are the units of measurement for the "100" in the motor designation H100-5?
A. Newtons
B. feet per second
C. Newton-seconds
D. Newtons per second
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Question B5
What is the maximum total impulse for a "J" rocket motor?
A. 320.00 Newton-seconds
B. 640.00 Newton-seconds
C. 1280.00 Newton-seconds
D. 2560.00 Newton-seconds
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Question C1
What is the maximum launch angle, measured from vertical, for a high power rocket?
A. 10 degrees
B. 15 degrees
C. 20 degrees
D. 25 degrees
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Question C5
The FAA has granted a waiver for high power rocket flight to 18000 feet for your event. Flights up to that altitude are expected. What is the minimum launch site dimension?
A. 1800 feet
B. 18,000 feet
C. 4500 feet
D. 9000 feet
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Question C6
The FAA has granted a waiver for high power rocket flight to 2500 feet for your 2xN clusterpowered rocket. What are the minimum launch site dimensions?
A. 500 feet
B. 1250 feet
C. 1500 feet
D. 4000 feet
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Question C12
What is the minimum safe distance from a high power rocket containing three (3) "H" motors?
A. 100 feet
B. 50 feet
C. 75 feet
D. 200 feet
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Question C14
Which of the following igniters may be ignited by the continuity test of some launch controllers?
A. Nichrome wire
B. Flashbulbs
C. Very low current electric matches
D. Both "B" and "C" above
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Question C17
Unless the motor manufacturer instructs otherwise, igniters for clustered rocket motors should be wired together in:
A. Open
B. Short Circuit
C. Parallel
D. Series
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Question C18
When should igniters installed in rocket motors be checked for continuity?
A. Only on the launch pad when ready for launch
B. Only in an enclosed shelter
C. Igniters should never be checked for continuity while installed in a rocket motor
D. Any time
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Question C21
Which of the following adhesives is most likely to be weakened under humid or wet weather conditions?
A. Cyanoacrylate glues (super glue)
B. White "Elmer's" glue
C. Slow-curing epoxy adhesives
D. Aliphatic resin based glues
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Question C22
Which of the following adhesives is the best choice for motor mount construction using phenolic motor tubes?
A. Aliphatic resin based glues
B. Cyanoacrylate glues (super glue)
C. Slow-curing epoxy adhesives
D. "Hot melt" adhesives
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Question C23
The centering rings provided with your high power kit are a loose fit around the phenolic motor tube. Which of the following adhesives is the best choice for a strong joint?
A. Aliphatic resin based glues
B. Cyanoacrylate glues (super glue)
C. Slow-curing epoxy adhesives
D. "Hot melt" adhesives
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Question C24
A small hole is typically recommended near the top, but below the nosecone or payload section shoulder, 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 vents internal air pressure as the rocket gains altitude to prevent internal air pressure from prematurely separating the model
C. The hole is used to give air pressure readings for on board altimeters prematurely separating the model
D. The hole allows easy verification that a parachute is installed
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Question C25
When clustering combinations of black powder and composite motors, which type of rocket motor should be ignited first?
A. It does not matter which motors are ignited first
B. Clusters should never mix composite and black powder motors
C. Composite rocket motors should be ignited first
D. Black powder rocket motors should be ignited first
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Question C26
Why should composite motors be ignited first in a mixed composite and black powder cluster?
A. The exhaust products from black powder motors prevent composite motor ignition
B. Composite motors are more likely to "cato" than black powder motors
C. Composite motors are more difficult and take longer to ignite
D. Composite rocket motors are more powerful than black powder motors
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Question C29
Petroleum based lubricants should not be used with the oxygen or nitrous oxide systems used in hybrids. Why?
A. They thicken when exposed to oxygen or nitrous oxide
B. There is a risk of spontaneous ignition or explosion
C. They lose their lubricating properties when exposed to oxygen or nitrous oxide
D. The lubricant can promote corrosion of the metal components in the presence oxygen or nitrous oxide
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Question C33
Which of the following individuals has the final authority in permitting a high power rocket to fly?
A. The range safety officer (RSO)
B. The rocket owner
C. The launch control officer (LCO)
D. The check-in officer
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Question C36
Your rocket was returned from its flight with "zipper" damage where the shock cord tore through the model. What is the most likely cause:
A. Parachute ejection occurred too soon after motor burnout
B. Parachute ejection occurred too late after apogee
C. Parachute ejection occurred at apogee on a vertical flight
D. Both "A" and "B"
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Question C37
Your payload section, with heavy payload, separated from your model immediately after motor burnout. What might be the cause?
A. The center of pressure at burnout was behind the center of gravity for the model
B. The payload shoulder was too loose in the body tube
C. The rocket motor had a failure of its delay system
D. Both "B" and "C" are correct
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Question C38
What is the distance around a launcher for a "J" powered model that must be cleared of easy to burn material, assuming the motor isn't "sparky?"
A. 10 feet
B. 50 feet
C. 30 feet
D. 75 feet
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Question C41
What is "titanium sponge?"
A. A substitute for ejection wadding
B. An ingredient used in some rocket motors that causes them to eject sparks in the exhaust
C. A lightweight material used in nose cones on supersonic rockets
D. An effective cleaning tool for high power rocket motor casings
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Question C43
According to NAR studies, the vast majority of unsuccessful flights fail because of:
A. Rockets that are structurally unsound
B. Rocket designs that are unstable
C. Recovery system failures
D. Rocket motor malfunctions
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Question C45
You have an excellent flying field, except that when the winds are from the northwest at over 10 mph, rockets often drift into neighboring fields where you don't have permission to fly. Your alternatives include:
A. Limit flights to lower altitudes so rockets stay on the field
B. Move the launch pad closer to the NW edge of the field, provided there are no roads or houses within 1500 feet
C. Don't fly on days with problematic winds
D. All of the above
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Question C48
The Range Safety Officer (RSO) is concerned about your High Power Rocket's stability. Which of the following can be applied to determine the model's stability?
A. Fly a sub-scale, model rocket version of the actual model
B. Perform manual calculations to determine the rocket's Center of Pressure (CP) location and verify the prelaunch Center of Gravity (CG) location
C. Provide simulation data showing the rocket's Center of Pressure (CP) location and prelaunch Center of Gravity (CG) locations
D. All of the above
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Question C50
Your field is 1500 x 1500 feet, and your FAA waiver is 3000 feet AGL. If you use parachutes sized to bring your rocket down at 20 feet per second, what is the maximum wind you can fly in for rockets that fly to the waiver altitude?
A. You can fly at 15 mph, if you have the pads at the upwind edge of the field, tilt into the wind and the rocket flies vertically
B. You are limited only by the HPR maximum wind of 20 miles per hour
C. You can fly in winds up to about 6 miles an hour, if you have the pads at the upwind edge of the field
D. This field can only be used in calm winds for flights to the waiver altitude
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Question C57
Twisted wire pairs in rocket wiring are considered good practice because:
A. It reduces resistance in wire bundles
B. It reduces strain on solder joints
C. It improves the routing of wire bundles
D. It resists electromagnetic interference from internal and external sources
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Question D6
During boost a rocket powered by a solid rocket motor tends to:
A. Become unstable
B. Become less stable in flight
C. Become more stable in flight
D. Have no change in stability
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Question D7
Which of the following can cause unstable flight?
A. Weak tubes or couplers that permit airframe bending
B. Misaligned motor mount tube or motor nozzle
C. Inadequate airspeed leaving the launch tower on a breezy day
D. All of the above
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Question D8
As a rule of thumb, how far should the center of pressure be from the center of gravity?
A. The center of pressure should be 1.0 body tube diameters ahead of the fin leading edge; the center of gravity does not matter
B. The center of pressure should be at the same location as the center of gravity
C. The center of pressure should be at least 1.0 body tube diameters ahead of the center of gravity
D. The center of pressure should be at least 1.0 body tube diameters behind the center of gravity
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Question E1
What is the airspeed velocity of an unladen swallow?
A. Mach 1
B. African or European?
C. c
D. 1 furlong per fortnight
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