Take the Challenge! ...

Test your gas safety knowledge with these questions taken from our Workshop delegate quizzes - choose Industrial or Laboratory Gas User.

Industrial User

Q1. The primary method used to identify gas cylinder contents is:

1. The cylinder label
2. The cylinder colour
3. Flammable gas cylinders have guards
4. Shape of the cylinder

Q2. What is the correct term to describe the removal of gas pressure from a system?

1. Snifting
2. Purging
3. Venting
4. Backflow

Q3. Which statement below describes the correct shutdown procedure for a mobile oxy-fuel gas unit which is to be left unattended?

1. No gas present, regulator, cylinder and torch valves closed
2. No gas present, regulator and torch valves open, cylinder valve closed
3. Gas present, regulator, cylinder and torch valves closed
4. Gas present, regulator and cylinder valves open, torch valves closed

Q4. What action should you take when an acetylene cylinder has been involved in a fire?

1. Put the fire out, wait five minutes before removing the cylinder to the store
2. Put the fire out, wait 10 minutes before removing the cylinder to the store
3. Sound the alarm, evacuate the premises and immediately call the fire brigade leaving the cylinder in situ
4. Sound the alarm, evacuate the premises and spray the cylinder from at least 10 ft away

Q5. Which of these substances can react violently when in contact with pressurised oxygen?

1. Neoprene and brass
2. Copper
3. Oils, greases and PTFE tapes
4. Glass and earthenware pots

Q6. On entering a 98% Nitrogen or Argon atmosphere a person will experience:

1. Light headedness, shortness of breath and gasping
2. Tight chest, feeling of drowning leading to unconsciousness in three to five minutes
3. Feel no symptoms but fall unconscious after just two breaths
4. Gasp uncontrollably, feel a choking sensation and pass out quickly

Q7. What is back flow and which item is designed to prevent it?

1. Backflow is an ignition and is prevented by the Flashback Arrestor
2. Back flow is the movement of gas from one hose into the other through the torch body & is prevented by operation of the Hose Check Valve (non return valve)
3. Backflow is a high-pressure wave preceding the flashback explosion; it is prevented by the Flashback Arrestor
4. Backflow is a sudden increase in pressure caused by closing cylinder valves too quickly; it is prevented by stem filters

Q8. Name two metals which react with acetylene

1. Lead and Tin
2. Aluminium and Molybdenum Steels
3. Silver and Gold
4. Copper & Silver

Q9. Which regulator type is associated with the 'rising pressure characteristic'?

1. Two Stage regulators
2. Multi Stage regulators
3. Single stage regulators
4. Propane Regulators

Q10. What are the correct methods of leak detection below?

1. Soap solution & leak detector fluid
2. Leak detector fluid & pressure drop test
3. Pressure drop test & washing up liquid
4. Washing up liquid & soap solution

Q11. What is the flammability range of acetylene in air?

1. 1 - 18 % acetylene content
2. 20 - 24 % acetylene content
3. 2 - 82 % acetylene content
4. 46 - 90 % acetylene content

Q12. What is the frequency of inspection of mobile oxy-fuel gas equipment required by BCGA Code of Practice 7?

1. Every 6 months
2. Every 2 years
3. Only after component replacement
4. At least annually

Laboratory Gas User

Q1. All inert gases are:

1. Heavier than air
2. Lighter than air
3. Ignite spontaneously
4. Asphyxiants

Q2. What is the correct term to describe the removal of gas pressure from a system?

1. Snifting
2. Purging
3. Venting
4. Backflow

Q3. The primary method used to identify gas cylinders is:

1. The cylinder label
2. The cylinder colour
3. Flammable gas cylinders have guards
4. Shape of the cylinder

Q4. Which of these substances can react violently when in contact with pressurised oxygen?

1. Neoprene and brass
2. Copper
3. Oils, greases and PTFE tapes
4. Glass and earthenware pots

Q5. Which statement correctly identifies the effects and symptoms of entering a carbon dioxide atmosphere of between 2-4 %:

1. After two breaths the victim will experience immediate collapse and death
2. The victim's breathing rate will increase and there will be a feeling of suffocation
3. The victim will be unaffected by such small percentages of carbon dioxide
4. The victim will laugh uncontrollably

Q6. On entering a 98% Nitrogen or Argon atmosphere a person will experience:

1. Light headedness, shortness of breath and gasping
2. Tight chest, feeling of drowning leading to unconsciousness in three to five minutes
3. Feel no symptoms but fall unconscious after just two breaths
4. Gasp uncontrollably, feel a choking sensation and pass out quickly

Q7. Which regulator type is associated with the rising 'pressure characteristic'?

1. Two Stage regulators
2. Multi Stage regulators
3. Single stage regulators
4. TPropane Regulators

Q8. What cylinder shoulder colour indicates toxic gas contents?

1. Pale Green
2. Red
3. Yellow
4. Black

Q9. What are the correct methods of leak detection below?

1. Soap solution & leak detector fluid
2. Leak detector fluid & pressure drop test
3. Pressure drop test & washing up liquid
4. Washing up liquid & soap solution

Q10. Which of these flammable gases is subject to the Reverse Joule-Thomson Effect?

1. Hydrogen
2. Acetylene
3. Methane
4. LPG

Q11. What is the liquid-to-gas ratio of liquid nitrogen?

1. 1 : 120
2. 1 : 250
3. 1 : 683
4. 1 : 712

Q12. Name two metals which react with acetylene

1. Lead and Tin
2. Aluminium and Molybdenum Steels
3. Silver and Gold
4. Copper & Silver

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