G20 Use of Flammable Compressed Gases
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1. What is the primary hazard associated with flammable compressed gases?
A. Corrosion of metals
B. Fire and explosion
C. Electrical shock
D. Radiation exposure
Answer: B. Fire and explosion
Flammable compressed gases can ignite easily when mixed with air and exposed
to an ignition source, creating a significant fire and explosion hazard.
2. Before using a compressed gas cylinder, the operator should first:
A. Remove all labels
,B. Verify the cylinder label and condition
C. Paint the cylinder
D. Lay it on its side
Answer: B. Verify the cylinder label and condition
Checking the label, markings, and physical condition helps ensure the correct gas
is used safely.
3. Cylinders must be secured because they:
A. Improve gas quality
B. Prevent tipping and damage
C. Reduce pressure
D. Increase gas flow
Answer: B. Prevent tipping and damage
A secured cylinder is less likely to fall, protecting the valve from damage that could
create a dangerous release.
4. The valve protection cap should remain in place:
A. Only indoors
B. Only outdoors
C. Whenever the cylinder is not connected for use
D. Only during inspections
Answer: C. Whenever the cylinder is not connected for use
The valve protection cap helps prevent valve damage during storage and
transportation.
5. A cylinder should be moved by:
A. Rolling it on its side
,B. Carrying it by the valve
C. Using an approved cylinder cart
D. Dragging it across the floor
Answer: C. Using an approved cylinder cart
An approved cylinder cart minimizes the risk of dropping or damaging the cylinder.
6. What should be done if a cylinder label is missing?
A. Guess its contents
B. Use it carefully
C. Identify it by color only
D. Remove it from service until identified
Answer: D. Remove it from service until identified
An unidentified cylinder must never be used because the contents cannot be
confirmed safely.
7. Flammable compressed gases should be kept away from:
A. Water
B. Ignition sources
C. Concrete
D. Plastic
Answer: B. Ignition sources
Heat, sparks, and open flames can ignite flammable gas.
8. Why is good ventilation important?
A. It cools cylinders
B. It reduces gas accumulation
, C. It lowers cylinder pressure
D. It improves cylinder color
Answer: B. It reduces gas accumulation
Proper ventilation prevents dangerous concentrations of flammable gas from
building up.
9. Which item should never be used to detect a gas leak?
A. Leak detection solution
B. Gas detector
C. Open flame
D. Soap solution
Answer: C. Open flame
Using an open flame to check for leaks can ignite escaping gas immediately.
10.A regulator should be:
A. Compatible with the gas and cylinder
B. Used on every gas type
C. Modified if necessary
D. Shared between incompatible gases
Answer: A. Compatible with the gas and cylinder
Using the correct regulator ensures safe pressure control and prevents equipment
failure.
11.Oxygen equipment should never be contaminated with:
A. Water
B. Dirt
C. Oil or grease
– Full Mock Exam for Revision Newest
(2025 - 2026 Update) From Real Past
Papers Questions – A Set Of 80 Most
Common Exam Frequently Tested
Questions And Answers In Details 100%
Verified Exam Highly Recommendable
Grade A+ (Verified Answers) Plus
Rationales | Instant Download Pdf
1. What is the primary hazard associated with flammable compressed gases?
A. Corrosion of metals
B. Fire and explosion
C. Electrical shock
D. Radiation exposure
Answer: B. Fire and explosion
Flammable compressed gases can ignite easily when mixed with air and exposed
to an ignition source, creating a significant fire and explosion hazard.
2. Before using a compressed gas cylinder, the operator should first:
A. Remove all labels
,B. Verify the cylinder label and condition
C. Paint the cylinder
D. Lay it on its side
Answer: B. Verify the cylinder label and condition
Checking the label, markings, and physical condition helps ensure the correct gas
is used safely.
3. Cylinders must be secured because they:
A. Improve gas quality
B. Prevent tipping and damage
C. Reduce pressure
D. Increase gas flow
Answer: B. Prevent tipping and damage
A secured cylinder is less likely to fall, protecting the valve from damage that could
create a dangerous release.
4. The valve protection cap should remain in place:
A. Only indoors
B. Only outdoors
C. Whenever the cylinder is not connected for use
D. Only during inspections
Answer: C. Whenever the cylinder is not connected for use
The valve protection cap helps prevent valve damage during storage and
transportation.
5. A cylinder should be moved by:
A. Rolling it on its side
,B. Carrying it by the valve
C. Using an approved cylinder cart
D. Dragging it across the floor
Answer: C. Using an approved cylinder cart
An approved cylinder cart minimizes the risk of dropping or damaging the cylinder.
6. What should be done if a cylinder label is missing?
A. Guess its contents
B. Use it carefully
C. Identify it by color only
D. Remove it from service until identified
Answer: D. Remove it from service until identified
An unidentified cylinder must never be used because the contents cannot be
confirmed safely.
7. Flammable compressed gases should be kept away from:
A. Water
B. Ignition sources
C. Concrete
D. Plastic
Answer: B. Ignition sources
Heat, sparks, and open flames can ignite flammable gas.
8. Why is good ventilation important?
A. It cools cylinders
B. It reduces gas accumulation
, C. It lowers cylinder pressure
D. It improves cylinder color
Answer: B. It reduces gas accumulation
Proper ventilation prevents dangerous concentrations of flammable gas from
building up.
9. Which item should never be used to detect a gas leak?
A. Leak detection solution
B. Gas detector
C. Open flame
D. Soap solution
Answer: C. Open flame
Using an open flame to check for leaks can ignite escaping gas immediately.
10.A regulator should be:
A. Compatible with the gas and cylinder
B. Used on every gas type
C. Modified if necessary
D. Shared between incompatible gases
Answer: A. Compatible with the gas and cylinder
Using the correct regulator ensures safe pressure control and prevents equipment
failure.
11.Oxygen equipment should never be contaminated with:
A. Water
B. Dirt
C. Oil or grease
