UKRA Level 2, RSO & Hybrid Exam

What does 'CG' stand for in rocket terminology?
1. Calculated gravity
2. Centre of gravity
3. Concentric geometry
What does 'CP' stand for in rocket in rocket terminology?
1. Centre of pressure
2. Circular parachute
3. Calculated pressure
What relationship must the 'CG' of a rocket have to the 'CP' of a
rocket for it to fly safely?
1. The 'CG' must be greater than the 'CP'
2. The 'CG' must be at least one body tube diameter forward of the 'CP'
3. The 'CG' must be at least one body tube diameter aft of the 'CP'
Which of the following suggestions would help most to make a
marginally stable rocket safer to fly?
1. Add weight to the nose
2. Make the fins smaller
3. Use a less powerful motor
If the wind at your launch site is blowing toward trees at an
average speed of 35 km/hour (approx. 22mph) should you. . . .
1. Angle your rocket 10 degrees into the wind to minimise recovery drift
2. Reduce the size of the parachute to increase descent rate
3. Not fly your rocket at all
You have a rocket, which is predicted to go to 610m (approx.
2000ft on an I161 reload but a strong breeze is blowing. For
safety what would be the best action to take. . . .
1. Use a slower burning I112 reload to reduce the rockets peak altitude
2. Use a smaller parachute to stop the rocket drifting out of the site
3. Use a faster burning I357 reload to increase the rocket's take off velocity
If you recess the nozzle end of a rocket motor more than one
body tube diameter into the base of a rocket what will happen?
1. The 'Krushnick Effect' will cause the motor's power to be lost
2. The rocket will fly erratically due to the change in its 'CG'
3. The 'Bernoulli principle' dictates the rocket may not lift off the launch pad.
You are making an ejection charge to be fired from an altimeter
in a 100 mm (approx. 4 inch) diameter rocket. The charge
should be about:
1. 1g in weight
2. 6g in weight
3. 28g in weight
A rocket is predicted to reach 1036m (approx. 3400ft) in
altitude. Its potential maximum ballistic range is around. . .
1. 671m (2200ft)
2. 1036m (3400ft)
3. 2134m (7000ft)
A rocket is 150mm (approx. 6 inches) in diameter, 2.44m
(approx. eight feet) long and weighs around 6kg (12lbs
approx.) without a motor. A good motor for its first flight
would be. . . .
1. A 600ns I435
2. A 1280ns J415
3. A 5120ns L952
A rocket motor of 1200ns total impulse and burning for 6
seconds would be classed as a. . . .
1. J1200
2. K200
3. J200
Which of the following motors has the longest burn time?
1. A 1280ns J300
2. A 700ns J 200
3. A 1000ns J420
Which of the following motors has the highest average thrust?
1. A 1200ns J400
2. A 1280ns J280
3. A 2560ns K250
What is the total impulse of a motor that gives 400n average
thrust for four seconds?
1. 400ns
2. 400 Newtons
3. 1600ns
A rocket weighing 1kg (2lbs approx.) without motor and flying
on a motor giving 800n of thrust will. .
1. Probably crash because it is underpowered
2. fly well but not go very high
3. probably reach supersonic speed
A rocket motor is classed as 'high power' if its propellant mass
is greater than:
1. 125g
2. 62.5g
3. 100g
When does a UKRA Safety Officer have authority to cancel a
launch?
1. When consulted by the flyer
2. When the Launch Control Officer is unavailable to check a flight
3. At all times
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single I or J class motor?
1. 45m (148ft)
2. 15m (49ft)
3. 60m (197ft)
A rocket has an I284 composite reload & ten D12 black powder
motors in it, all electrically ignited by individual igniters. What
is the probable launch scenario?
1. The I284 will light first then the 'D's will air light. The flight will be
  successful.
2. The 'D's will light first lifting the rocket off the pad at a very low speed
  increasing the risk of a crash when the I284 lights moments later.
3. All motors will fire at about the same time.
Roughly what altitude will a 100mm (approx. 4inch) diameter
rocket weighing 3kg (6lbs approx.) and flying on a full 640ns 'I'
motor reach.
1. Approximately 427m (1400ft)
2. Approximately 762m (2500ft)
3. Approximately 1189m (3900ft)
Roughly what altitude will a 150mm (approx. 6 inch) diameter
rocket weighing 7kg (14lbs approx.) and flying on a full
2560ns 'K' motor reach.
1. Approximately 396m (1300ft)
2. Approximately 671m (2200ft)
3. Approximately 1219m (4000ft)
Roughly what altitude will a 66mm (approx. 2.6 inch) diameter
rocket weighing 1.5kg (3lbs approx.) and flying on a 240ns 'H'
motor reach.
1. Approximately 274m (900ft)
2. Approximately 610m (2000ft)
3. Approximately 1036m (3400ft)
Which of Newtons laws of motion best describes the operation
of a rocket motor?
1. 1st law: A body will stay still or in constant motion in a straight line unless
  acted upon by a force.
2. 2nd law: The rate of change of momentum in a body is proportional to the
  force acting upon the body.
3. 3rd law: For every action there is an equal and opposite reaction.
What are the three principle forces acting on a rocket during
flight?
1. Thrust, body diameter and surface finish.
2. Nose shape, thrust and aerodynamic drag.
3. Gravity, thrust and aerodynamic drag.
What are the three factors that have the greatest effect on a
rocket's peak altitude?
1. Lift off weight, propellant weight and motor thrust.
2. Fin size, propellant weight and motor thrust.
3. Motor thrust, weight and aerodynamic drag.
To fly a rocket with a single motor of 2000ns total impulse you
must be UKRA certified to:
1. Level 1
2. Level 2
3. Level 3
To fly a rocket powered by a cluster consisting of one 'H' class
motor and three 'D' class motors totalling 330ns you must be
UKRA certified to:
1. Level 1
2. Level 2
3. Level 3
All launch pads / towers must be:
1. Rigid enough so as not to deflect or break under 48 kilometre/hour (30mph)
  winds.
2. Able to support the weight of the largest rocket that could be fitted to it.
3. Rigid enough so as not to deflect under strongest launchable winds.
A payload cannot be flown if it is:
1. Likely to cause radio interference.
2. Inflammable in nature.
3. Over 2 times the weight of the empty rocket in which it is to be flown.
4. A vertebrate creature.
To achieve Level 1 certification you must:
1. Successfully launch a rocket powered by motor/s of 160.01 to 640.01ns
  total impulse.
2. Successfully launch and retrieve a rocket powered by an 'H' or 'I' motor.
3. Successfully demonstrate to the RSO a rocket flight powered by an 'H' or 'I'
  class motor.
A rocket containing seven motors ignited with fuses is:
1. Automatically classed as experimental.
2. Not allowed to fly at a UKRA event.
3. Classed as a complex rocket and should be launched from a greater
  distance than an equal power rocket employing a single motor.
A two-stage rocket employing an 'I' class booster and 'H' class
sustainer is:
1. Classed as a 'complex' rocket and should be launched from a greater distance
  than an equal power rocket employing a single motor.
2. To be treated in the same way as a single stage 'J' powered rocket.
3. Classed as a Level 2 rocket because its total impulse is over 640.01ns.
A two stage rocket employing electronic ignition of the second
stage crashes during first stage burn. The first thing the safety
officer must do is:
1. Check if the rocket is damaged.
2. Inform the Launch Control Officer of the situation then take a fire extinguisher
  to the rocket in case of a grass fire at the impact point.
3. Stop spectators approaching the live upper stage and make sure everyone is
  ready in case of a land shark.
The most important things to check for on a high performance
rocket before allowing it to fly are:
1. Recovery attachment, fin attachment and shock cord mount.
2. Nose / payload attachment, recovery attachment and body tube strength.
3. Fin attachment, static vent and motor mount strength.
4. All of the above.
If anyone on the range shouts 'heads up' the safety officer must:
1. Run for the nearest cover.
2. Get the spectators to the nearest cover.
3. Encourage everyone to stand still and look up.
If a NOTAM has been issued to 762m (2500ft) and a rocket is
predicted to reach 777m (2550ft) in altitude the Safety Officer
should:
1. Refuse permission to fly.
2. Check over the altitude predictions to determine their accuracy.
3. Consult with the LCO and make a visual check for aircraft before flight.
Night launching of high power rockets is only permitted:
1. When illuminated recovery devices are employed.
2. When illuminated recovery devices are employed, on November 5th or when
  special permission has been given by the Technical and Safety committee of
  UKRA for a non-illuminated night flight.
3. On November 5th, away from coasts and when illuminated recovery devices
  are employed.
You should endeavour to build your rockets so that it may be
recovered:
1. By parachute.
2. Within the boundary of the launch area.
3. Substantially intact so as they can be launched again.
A certification flight is considered successful when:
1. The rocket is brought back to the certifying officer intact.
2. The rocket successfully deploys its recovery system.
3. The rocket launches successfully.
What does the circular symbol on rockets 'A' and 'B' mean?
1. Centre of gravity.
2. Centre of Pressure.
3. Rotational symmetry point in diagram.
What is wrong with the aft fins on rocket 'A' if it were intended
for high speed flight?
1. They are not big enough.
2. They are not of a delta design.
3. Their span is too great in comparison with their root edge.
What effect may the forward fins have on the flight
characteristics of rocket 'A'?
1. They will add to its stability by increasing the overall fin area.
2. They will decrease its stability because they move its C/P forward.
3. They will have little effect because of the rocket's length.
From the information supplied by the diagram would you
expect rocket 'A' to be stable in low-speed flight?
1. No it will probably be unstable.
2. Yes it will probably be stable.
3. There is not sufficient information supplied.
Between rocket 'A' and 'B' which would be more likely to
survive supersonic flight, assuming similar construction?
1. Rocket 'A'.
2. Rocket 'B'.
3. There is insufficient information supplied.
Between rocket 'A' and 'B' which is more stable?
1. Rocket 'A'.
2. Rocket 'B'.
3. There is insufficient information supplied.
Rocket 'B' has a solid hard-wood nose cone. For safety, what
would you recommend to the flyer?
1. To use a light balsa or plastic nose instead.
2. To angle the rocket down range and launch in light breeze only.
3. Not to fly at all because the rocket is too dangerous.
If rocket 'A' is 100mm (approx. 4") in diameter and weighs 3kg
(6lbs approx.) and rocket 'B' is 125mm (approx. 5") in diameter
and weighs 2.5kg (5lbs approx.) which would reach the higher
altitude if both were launched on identical motors?
1. Rocket 'A'.
2. Rocket 'B'.
3. There is insufficient information supplied.
Between rocket 'A' and 'B' which has a more suitable nose
shape for flight at 1290 kilometres/hour (approx. 800mph)?
1. Rocket 'A'
2. Rocket 'B'
3. Both are unsuitable for such high speed flight.
If rocket 'B' was to be used for a level 2 certification flight and
there was a stiff breeze blowing what motor would you
recommend be used?
1. A 'J95' to keep airspeed low.
2. An 'I435' to keep airspeed high.
3. A 'J350' to keep airspeed moderate.
Devices with which UN numbers require an explosive licence?
Note Not Otherwise Specified =N.O.S.
1. UN 0432 Articles, Pyrotechnic for technical purposes 1.4S
2. UN 0275 Cartridges, Power Device 1.3C
3. UN 0349 Articles, Explosive, N.O.S. 1.4S
4. UN 0161 Powder, Smokeless 1.1C
5. UN 0351 Articles, Explosive, N.O.S. 1.4C
6. UN 0454 Igniters 1.4S
Devices with which UN numbers require an RCA?
Note Not Otherwise Specified =N.O.S.
1. UN 0432 Articles, Pyrotechnic for technical purposes 1.4S
2. UN 0275 Cartridges, Power Device 1.3C
3. UN 0349 Articles, Explosive, N.O.S. 1.4S
4. UN 0161 Powder, Smokeless 1.1C
5. UN 0351 Articles, Explosive, N.O.S. 1.4C
6. UN 0454 Igniters 1.4S
Which options apply to an “Acquire only” explosives
certificate?
1. Requires a registered store of relevant UN classes.
2. Must purchase and use certified motors on site.
3. May purchase motors certified motors mail order. (Requires RCA for relevant
  UN classes.)
4. Motors must be disposed of in an appropriate manner.
Which options apply to an “Acquire and Keep” explosives
certificate?
1. Requires a registered store of relevant UN classes.
2. Must purchase and use motors certified motors on site.
3. May purchase motors certified motors mail order. (Requires RCA for relevant
  UN classes.)
4. Must destroy any unused motors on site.
What is the maximum amount of NEQ (net explosive content)
that can be kept in a registered store (Mode B).
1. 10kg
2. 15kg
3. 7kg
4. One M Reload
What do you need an RCA document for?
1. To handle explosive material.
2. To transport explosive material.
3. To launch rockets.
What is a “registered store”?
1. A registered Ammo box.
2. The entire property named on the registration.
3. Your field launch box.
What is the life an explosives certificate, registered store and
RCA?
1. Store = 5 years, Explosives Cert. = 5 years, RCA = 5 years.
2. Store = 1 year, Explosives Cert. = 10 years, RCA = 10 years.
3. Store = 1 year, Explosives Cert. = 3 years, RCA = 5 years.
4. Store = 1 year, Explosives Cert. = 3 years, RCA = Life of explosives
  certificate.
Where may UN Class numbers for any item of interest to
UKRA members be obtained?
1. The manufacturer / distributor of the item.
2. The Police.
3. The HSE.
When determining the centre of gravity (CG) of a rocket with a
heavier motor at the launch site one can
1. Install the motor, recovery system and payload and determine the balance
  point of the rocket as it is ready for flight.
2. Balance the rocket with an empty motor because that is the condition of the
  rocket after burn out
3. It is not necessary to test for the centre of gravity when using a more powerful
  motor because it has more thrust.
What happens to the centre of gravity (CG) of a rocket during a
solid rocket motors thrusting phase.
1. The centre of gravity stays the same.
2. The centre of gravity shifts forward.
3. The centre of gravity shifts aft.
What happens to the coefficient of drag (Cd) as the rocket
approaches the speed of sound?
1. The Cd decreases.
2. The Cd stays the same.
3. The Cd increases.
What effect does a boat tail have on a subsonic rocket's
coefficient of drag (Cd)?
1. No effect, a boat tail is only a cosmetic design feature.
2. It increases the Cd by changing the airflow over the fins.
3. It decreases the Cd by reducing the base drag.
What is the thrust curve of a regressive motor burn?
1. A regressive burn has a high initial thrust relative to the ending thrust of the
  motor.
2. A regressive burn has a lower initial thrust relative to the ending thrust.
3. The thrust curve is flat.
What is the thrust curve of a progressive motor?
1. A progressive burn has a high initial thrust relative to the ending thrust of the
  motor.
2. A progressive burn has a lower initial thrust relative to the ending thrust.
3. The thrust curve is flat.
What is the function of a motor liner and the O-ring seals in a
solid rocket motor?
1. To hold all of the parts in place prior to ignition of the rocket motor.
2. To make the motor easier to clean if it is a reloadable motor.
3. To keep the hot gasses of the motor from burning or melting the motor case.
What is the most common oxidiser in commercially available
high power composite solid rocket motors?
1. Ammonium Perchlorate
2. Ammonium Nitrate
3. Ammonium Chlorate
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?
1. This hole allows excessive ejection charge pressures to vent to reduce shock cord stress
2. The hole is used to give air pressure readings for on-board altimeters.
3. The hole vents internal air pressure as the rocket gains altitude to prevent
  premature separation.
In general terms, the specific impulse of a rocket motor is:
1. The total thrust force of a motor throughout its action time.
2. The total impulse divided by unit weight of propellant.
3. Dependent on the diameter and length of the propellant grain.
In general terms, the total impulse of a rocket motor can be
described as:
1. The product of the average motor thrust and its burn time.
2. The product of the propellant weight and its burn time.
3. The product of the propellant weight and the motor thrust.
What is a Newton?
1. The amount of force required to accelerate one pound one foot per second per second.
2. The amount of force required to accelerate one kg, one foot per second per second.
3. The amount of force required to accelerate one kg, one meter per second per second.
What does the motor designation I220-8 mean?
1. The motor is in the I impulse range with an average thrust of 220 Newtons and an 8 second delay from motor ignition.
2. The motor is in the I impulse range, having a total impulse of 620 Newtonseconds With an average thrust of 220 Newtons and an 8 second delay from
  motor burn-out.
3. 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. *
What is the difference in kinetic energy between two identical rockets, one descending at 9.1m/second (30 feet per second), the other descending at 18.3m/second (60 feet per second)?
1. Cannot be determined without the weight.
2. Two times as much energy.
3. Four times as much energy.
The equation for determining the energy of a moving body (such as a rocket) is:
Note : m=Mass v=Velocity a=Area
1. E = 1/2 mv2
2. E = ma2
3. E = mv3
What is the purpose of a launch lug?
1. To add drag to the rocket at launch.
2. To guide the rocket along the launch rod or rail.
3. Both
A rocket with a motor cluster consisting of a central composite
54mm J415 motor and four 29mm G80 composite motors using
electric matches:
1. will result in all motors starting about the same time.
2. will result in the J415 motor starting first followed by the G80's.
3. will result in the G80's starting first followed by the J415.
What is a shred?
1. A failure of the rocket air frame during boost resulting in destruction of the
  rocket.
2. A failure of the recovery system during boost.
3. A failure of the motor causing early ejection.
What is a cato?
1. A failure of the rocket resulting in failure of the air frame during boost.
2. A failure of the recovery system during boost.
3. A failure of the motor causing flight termination.
What is a complex high power rocket?
1. A rocket having more than one stage.
2. A rocket having a cluster of rocket motors.
3. Both
When is a recovery device not necessary in a high power
rocket?
1. When the high power rocket is intended for ballistic flight.
2. When the rocket has a bursting charge.
3. A recovery device is always necessary.
When must the stability of a rocket be determined?
1. If the safety monitor requests it.
2. When designing a new rocket.
3. Whenever the rocket is prepared for flight.
What is the maximum weight of a high power rocket?
1. Less than maximum weight recommended by the motor manufacturer for a
  given motor.
2. Less than 50 kg (112 pounds).
3. There is no maximum high power rocket weight.
When is it permissible to catch a high power rocket?
1. If the rocket weights less than 1 kg (2.2 pounds).
2. It is never permissible to catch a high power rocket.
3. Neither
When is it permissible to consume alcohol when prepping or
launching high power rockets?
1. When the preparation is done the day before the launch.
2. If the blood alcohol level is below the 'impaired" level.
3. It is never permitted.
What is the minimum safe distance for the operator from a
Hybrid engine powered vehicle?
1. 30.5m (100 ft).
2. 36.6m (120 ft)
3. As referenced in the Safe Distance Chart.
At what temperature in Degrees Centigrade does Nitrous Oxide
break down?
1. 570
2. 610
3. 750
What does a Hybrid engine require to be flown under UKRA
insurance?
1. A ventable tank.
2. Must be commercially available.
3. Both
What is the oxidiser most commonly used in a commercial
hybrid rocket engine?
1. N2O.
2. N2O4.
3. NO2.
What is the nominal tank pressure of a nitrous oxide hybrid
motor at 23.9o C (75o F)?
1. 0.69 MPa (100 p.s.i.)
2. 5.17 MPa (750 p.s.i.)
3. 10.34 MPa (1,500 p.s.i)
Above what temperature, in degrees Centigrade (Farenheight),
does pressurised nitrous oxide change to a gas?
1. 36.1 (97).
2. 24 (75).
3. 2.7 (37).
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single A class motor?
1. 2 Metres.
2. 3 Metres.
3. 5 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single B or C class motor?
1. 2 Metres.
2. 3 Metres.
3. 5 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single D class motor?
1. 2 Metres.
2. 3 Metres.
3. 5 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single E class motor?
1. 7 Metres.
2. 3 Metres.
3. 5 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single F or G class motor?
1. 10 Metres.
2. 7 Metres.
3. 5 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single H class motor?
1. 15 Metres.
2. 10 Metres.
3. 7 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single K class motor?
1. 15 Metres.
2. 60 Metres.
3. 45 Metres.
At what minimum distance should all persons, except those
required for the launch of a rocket, be kept when the vehicle is
powered by a single L or M class motor?
1. 60 Metres.
2. 150 Metres.
3. 90 Metres.
For a rocket powered by a _ or _ A class motor the launch site
should normally have the following minimum dimension.
1. 15 Metres.
2. 30 Metres.
3. 60 Metres.
For a rocket powered by an A class motor the launch site
should normally have the following minimum dimension.
1. 15 Metres.
2. 30 Metres.
3. 60 Metres.
For rockets powered by a B class motor the launch site should
normally have the following minimum dimension.
1. 15 Metres.
2. 30 Metres.
3. 60 Metres.
For a rocket powered by a C class motor the launch site should
normally have the following minimum dimension.
1. 120 Metres.
2. 30 Metres.
3. 60 Metres.
For a rocket powered by a D class motor the launch site should
normally have the following minimum dimension.
1. 150 Metres.
2. 300 Metres.
3. 450 Metres.
For rockets powered by an E, F or G class motor the launch site
should normally have the following minimum dimension.
1. 150 Metres.
2. 300 Metres.
3. 450 Metres.
For rockets powered by an H class motor the launch site should
normally have the following minimum dimension.
1. 450 Metres.
2. 300 Metres.
3. 760 Metres.
For a rocket powered by an I class motor the launch site should
normally have the following minimum dimension.
1. 450 Metres.
2. 300 Metres.
3. 760 Metres.
For rockets powered by a J or K class motor the launch site
should normally have the following minimum dimension.
1. 760 Metres.
2. 3200 Metres.
3. 1600 Metres.