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 1122
C. NFPA 1125
D. NFPA 1127

 

Question A7
What is the maximum allowable weight for a High Power Rocket permitted per NFPA 1127?
A. 400 pounds
B. 3069 pounds
C. 100 pounds
D. There is no limit provided the rocket weighs less than 1/3 of the average certified thrust of the motors intended to be ignited at launch

 

Question A8
What is the minimum age for user certification? [Note: Excludes NAR Jr. HPR program]
A. 16 years old
B. 25 years old
C. 21 years old
D. 18 years old

 

Question A11
A launch site is defined as containing areas for which of the following activities?
A. Launching
B. Recovery
C. Parking
D. All of the above

 

Question A14
You're attending a launch that has a thin (but see-through) cloud layer at ~3,000 feet and clear blue skies above it. Is it okay to "punch" through this cloud layer with a High Power Rocket if there's a Certificate of Waiver or Authorization (COA) granting Class 2 flights up to 6,000 feet?
A. Yes, since there is an active COA, High Power Rockets can be flown up to the 6,000 foot altitude limit
B. No, flights into any clouds are prohibited unless specifically waived by the FAA
C. Yes, as long as the cloud layer can barely be seen through and the RSO allows it
D. Both "A" and "C" above

 

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

 

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

 

Question A19
Which of the following are operating limitations for Class 2 High Power Rockets per the FAA's FAR 101 Regulations?
A. At any altitude where clouds or obscuring phenomena of more than five-tenths coverage prevails
B. At any altitude where the horizontal visibility is less than five miles
C. Into any cloud
D. All of the above

 

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

 

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

 

Question B1
What does the "H" in the motor designation H100-5 stand for?
A. It indicates the total power range or impulse range of the rocket motor
B. It is the first letter in the manufacturer's name
C. It indicates the total thrust of the rocket motor
D. It indicates that the motor uses black powder as a propellant

 

Question B2
What does the "100" in the motor designation H100-5 stand for?
A. It is the average thrust in Newtons of the rocket motor
B. It is the manufacturer's retail price code
C. It is the rocket motor burn time in seconds
D. It is the peak thrust in pounds of the rocket motor

 

Question B4
What are the units of measurement for the "100" in the motor designation H100-5?
A. feet per second
B. Newtons
C. Newton-seconds
D. Newtons per second

 

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

 

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

 

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. 4000 feet
D. 1500 feet

 

Question C12
What is the minimum safe distance from a high power rocket containing three (3) "H" motors?
A. 50 feet
B. 200 feet
C. 75 feet
D. 100 feet

 

Question C16
Which of the following is most likely to cause catastrophic failure of a black powder rocket motor?
A. High altitude
B. Electromagnetic fields
C. Vibration
D. Temperature cycling

 

Question C17
Unless the motor manufacturer instructs otherwise, igniters for clustered rocket motors should be wired together in:
A. Short Circuit
B. Open
C. Series
D. Parallel

 

Question C18
When should igniters installed in rocket motors be checked for continuity?
A. Only in an enclosed shelter
B. Any time
C. Igniters should never be checked for continuity while installed in a rocket motor
D. Only on the launch pad when ready for launch

 

Question C21
Which of the following adhesives is most likely to be weakened under humid or wet weather conditions?
A. Slow-curing epoxy adhesives
B. White "Elmer's" glue
C. Cyanoacrylate glues (super glue)
D. Aliphatic resin based glues

 

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

 

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. The hole allows easy verification that a parachute is installed
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. This hole allows excessive ejection charge pressures to vent to reduce shock cord stress

 

Question C25
When clustering combinations of black powder and composite motors, which type of rocket motor should be ignited first?
A. Black powder rocket motors should be ignited first
B. Clusters should never mix composite and black powder motors
C. It does not matter which motors are ignited first
D. Composite rocket motors should be ignited first

 

Question C28
What is (are) the advantages of using a "relay" type launch control?
A. It is cheaper than a non-relay launch control
B. The relay allows a better indication of igniter continuity
C. It can deliver more power to the rocket motor igniters
D. Both "B" and "C" above

 

Question C30
Which of the following safety hazards may be associated with hybrid rocket motors?
A. High pressure gas, low temperatures (frostbite)
B. Low temperatures (frostbite)
C. High pressure gas
D. Corrosive materials

 

Question C31
The range safety officer says that your model is unsafe to fly. Who has the authority to overturn this ruling:
A. The Launch Control Officer (LCO)
B. The individual who "checked-in" the model
C. Three certified high power fliers who agree the model is safe
D. The safety monitor's (RSO) decision cannot be overturned by anyone

 

Question C32
Parachute ejection systems that sense barometric pressure for activation need a vent to the outside in their compartment because:
A. The hole is used to sample air pressure outside the rocket's airframe
B. This hole allows excessive ejection charge pressures to vent
C. This hole vents internal air pressure as the rocket gains altitude to prevent internal air pressure from prematurely separating the model
D. The hole allows easy verification that the battery is installed

 

Question C33
Which of the following individuals has the final authority in permitting a high power rocket to fly?
A. The rocket owner
B. The launch control officer (LCO)
C. The range safety officer (RSO)
D. The check-in officer

 

Question C34
Which of the following individuals has the ultimate responsibility to ensure that the rocket was built in a safe manner?
A. The launch control officer (LCO)
B. The safety monitor (range safety officer or RSO)
C. The rocket owner/builder
D. All of the above

 

Question C35
Parachute ejection systems that sense barometric pressure can malfunction during supersonic flight because:
A. Aerodynamic heating changes the values of electronic components.
B. The outside pressure distribution is not continuous around the model.
C. Static discharges will "zap" sensitive electronic components.
D. Both answers "A" and "B" are correct.

 

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"

 

Question C43
According to NAR studies, the vast majority of unsuccessful flights fail because of:
A. Recovery system failures
B. Rockets that are structurally unsound
C. Rocket designs that are unstable
D. Rocket motor malfunctions

 

Question C49
Your high-power rocket lands in a power line. Which of the following is true?
A. You must leave it alone and you must call the power company
B. You can retrieve it if part of it is already on the ground
C. You can retrieve it if you have a non-conductive tool, such as a "hot-stick"
D. You can retrieve it if the power line is on a wooden (not metal) pole

 

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

 

Question C57
Twisted wire pairs in rocket wiring are considered good practice because:
A. It resists electromagnetic interference from internal and external sources
B. It reduces strain on solder joints
C. It improves the routing of wire bundles
D. It reduces resistance in wire bundles

 

Question C60
Which sequence below provides the highest level of range safety when launching a rocket utilizing an onboard electronically actuated recovery system?
A. Arm recovery system electronics, install igniter, touch igniter clips together, connect clips to igniter
B. Install igniter, touch igniter clips together, connect clips to igniter, arm recovery system electronics
C. Install igniter, arm recovery system electronics, touch igniter clips together, connect clips to igniter
D. None of the above

 

Question D1
For a rocket to be stable which of the following statements is true?
A. The length of the body tube must be at least 5 times the model diameter
B. The rocket must have fins
C. The center of pressure (CP) must be behind the center of gravity (CG)
D. The center of pressure (CP) must be in front of the center of gravity (CG)

 

Question D4
A rocket's center of pressure can be estimated by:
A. The "Barrowman" method
B. Finding the point where the model balances
C. "Cardboard cutout" method
D. Both "A" and "C" above

 

Question D9
The definition of Positive Stability in regards to a rocket is:
A. Where the center of gravity (CG) is located ahead (forward) of the center of pressure (CP)
B. Where the center of gravity (CG) and the center of pressure (CP) lie at the same locations
C. Where the center of gravity (CG) is located behind (aft) of the center of pressure (CP)
D. None of the above

 

Question E1
What is the airspeed velocity of an unladen swallow?
A. 1 furlong per fortnight
B. Mach 1
C. African or European?
D. c