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NGA 70 - AOCS & PROPERTIES OF NATURAL
GAS 2025 BRAND NEW ACTUAL EXAM WITH
100% VERIFIED QUESTIONS AND CORRECT
SOLUTIONS| ACE YOUR GRADES.
1. Internal freezing of pressure regulators, poor pressure of line
blockage or meter blockages are caused by - correct answer -
Moisture condensing in a pipeline
2. Fuel or gas to burn, oxygen in the air to react, ignition source -
correct answer -Combustion elements
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3. Natural Gas and air mixtures, lower than 5% natural gas will -
correct answer -not burn
4. Natural Gas and air mixtures, of approximately 5%-15% natural
gas will - correct answer -burn
5. Natural gas and air mixtures, higher than 15% will - correct
answer -not burn, but are considered hazardous atmospheres
6. Complete combustion results in - correct answer -water and
carbondioxide
7. Incomplete combustion results in - correct answer -by-products
including carbon monoxide and aldehydes
8. A yellow flame on the normal gas burner indicates - correct
answer -burner is out of adjustment or air, may result in carbon
monoxide
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9. Incomplete combustion is occurring and the appliance is not
properly vented causes - correct answer -sharp pungent odor
indicating the presence of aldehydes
10. If aldehydes are present, most likely this chemical is too -
correct answer -carbon monoxide
11. Immediately evacuate the building, eliminate all sources of
ignition, seek assistance from appropriate company personnel
to ventilate the building - correct answer -Preventing Ignition of
Combustible Gas
12. Ignition temperature of Natural Gas - correct answer -1100
13. Ignition temperature of Propane - correct answer -874
14. Ignition temperature of Butane - correct answer -806
NGA 70 - AOCS & PROPERTIES OF NATURAL
GAS 2025 BRAND NEW ACTUAL EXAM WITH
100% VERIFIED QUESTIONS AND CORRECT
SOLUTIONS| ACE YOUR GRADES.
1. Internal freezing of pressure regulators, poor pressure of line
blockage or meter blockages are caused by - correct answer -
Moisture condensing in a pipeline
2. Fuel or gas to burn, oxygen in the air to react, ignition source -
correct answer -Combustion elements
, Page | 2
3. Natural Gas and air mixtures, lower than 5% natural gas will -
correct answer -not burn
4. Natural Gas and air mixtures, of approximately 5%-15% natural
gas will - correct answer -burn
5. Natural gas and air mixtures, higher than 15% will - correct
answer -not burn, but are considered hazardous atmospheres
6. Complete combustion results in - correct answer -water and
carbondioxide
7. Incomplete combustion results in - correct answer -by-products
including carbon monoxide and aldehydes
8. A yellow flame on the normal gas burner indicates - correct
answer -burner is out of adjustment or air, may result in carbon
monoxide
, Page | 3
9. Incomplete combustion is occurring and the appliance is not
properly vented causes - correct answer -sharp pungent odor
indicating the presence of aldehydes
10. If aldehydes are present, most likely this chemical is too -
correct answer -carbon monoxide
11. Immediately evacuate the building, eliminate all sources of
ignition, seek assistance from appropriate company personnel
to ventilate the building - correct answer -Preventing Ignition of
Combustible Gas
12. Ignition temperature of Natural Gas - correct answer -1100
13. Ignition temperature of Propane - correct answer -874
14. Ignition temperature of Butane - correct answer -806
