PRACTICE TEST FOR TASK 70 -
CHARACTERISTICS OF NATURAL GAS
EXAM QUESTIONS AND ANSWERS
Neither is more likely. They both have the same likelihood to ignite. - Answer-Which is
more likely to ignite: a leak on a low pressure system or on a high pressure system?
Take extreme caution
Eliminate sources of ignition
Ventilate
Evacuate - Answer-What are the four steps to take when a high level of gas is detected
in a building?
1110 degrees Fahrenheit - Answer-What is the ignition temperature of natural gas?
Natural gas - Answer-What gas has an ignition temperature of 1110 degrees
Fahrenheit?
84% - Answer-What is the ignition temperature of propane?
Propane - Answer-What gas has an ignition temperature of 84 degrees Fahrenheit?
806 degrees Fahrenheit - Answer-What is the ignition temperature of butane?
Butane - Answer-What gas has an ignition temperature of 806 degrees Fahrenheit?
Gasoline
Kerosene
Fuel Oil - Answer-What three gasses have an ignition temperature of 490 degrees
Fahrenheit?
490 degrees Fahrenheit - Answer-Gasoline, kerosene, and fuel oil have an ignition
temperature of what?
Pressure and density - Answer-What increases when gas is compressed?
From an area of higher pressure to one of lower pressure. - Answer-How does natural
gas flow?
, Slower in a low pressure system. - Answer-Does natural gas move faster or slower in a
low pressure system than in a high pressure system?
Methane - Answer-The main component of natural gas is _________.
Fuel (Natural Gas), Heat Source (Fire, match, spark etc.) and Oxygen - Answer-
Combustion is a chemical reaction that requires which 3 elements?
Air and gas - Answer-Natural Gas will only burn with the right mix of what two things?
Oxygen and a correct fuel mixture - Answer-Combustion is a chemical reaction between
____________ and a ________________________?
Blue - Answer-What color flame will you see when gas combustion is normal?
A correct amount of fuel and oxygen for proper combustion - Answer-What do steady
blue flames mean?
Upwind - Answer-How should you position fire extinguishers?
Over pressure - Answer-What can cause high pilots on stoves and other equipment?
Over pressure - Answer-What can cause gas lines to rupture?
Over pressurization - Answer-A high pilot is an indication of what?
Shut off gas supply and contact appropriate company personnel - Answer-What two
steps should you follow if an overpressure event occurs?
Under pressurization - Answer-What causes lack of gas at an appliance?
Under pressure - Answer-What kind of pressure can damaged control lines at regulator
stations cause?
Under pressure - Answer-Broken gas lines or other damage by construction may
cause?
Shut off gas supply and contact appropriate company personnel - Answer-What two
steps should you follow if an under pressure event occurs?
Pipeline masking - Answer-No gas odor due to ____________________
____________________ needs to be reported.
Shut off meters to affected customers and contact appropriate company personnel -
Answer-If you encounter an abnormal operating condition that is related to gas service
to a customer, what two things should you do?
CHARACTERISTICS OF NATURAL GAS
EXAM QUESTIONS AND ANSWERS
Neither is more likely. They both have the same likelihood to ignite. - Answer-Which is
more likely to ignite: a leak on a low pressure system or on a high pressure system?
Take extreme caution
Eliminate sources of ignition
Ventilate
Evacuate - Answer-What are the four steps to take when a high level of gas is detected
in a building?
1110 degrees Fahrenheit - Answer-What is the ignition temperature of natural gas?
Natural gas - Answer-What gas has an ignition temperature of 1110 degrees
Fahrenheit?
84% - Answer-What is the ignition temperature of propane?
Propane - Answer-What gas has an ignition temperature of 84 degrees Fahrenheit?
806 degrees Fahrenheit - Answer-What is the ignition temperature of butane?
Butane - Answer-What gas has an ignition temperature of 806 degrees Fahrenheit?
Gasoline
Kerosene
Fuel Oil - Answer-What three gasses have an ignition temperature of 490 degrees
Fahrenheit?
490 degrees Fahrenheit - Answer-Gasoline, kerosene, and fuel oil have an ignition
temperature of what?
Pressure and density - Answer-What increases when gas is compressed?
From an area of higher pressure to one of lower pressure. - Answer-How does natural
gas flow?
, Slower in a low pressure system. - Answer-Does natural gas move faster or slower in a
low pressure system than in a high pressure system?
Methane - Answer-The main component of natural gas is _________.
Fuel (Natural Gas), Heat Source (Fire, match, spark etc.) and Oxygen - Answer-
Combustion is a chemical reaction that requires which 3 elements?
Air and gas - Answer-Natural Gas will only burn with the right mix of what two things?
Oxygen and a correct fuel mixture - Answer-Combustion is a chemical reaction between
____________ and a ________________________?
Blue - Answer-What color flame will you see when gas combustion is normal?
A correct amount of fuel and oxygen for proper combustion - Answer-What do steady
blue flames mean?
Upwind - Answer-How should you position fire extinguishers?
Over pressure - Answer-What can cause high pilots on stoves and other equipment?
Over pressure - Answer-What can cause gas lines to rupture?
Over pressurization - Answer-A high pilot is an indication of what?
Shut off gas supply and contact appropriate company personnel - Answer-What two
steps should you follow if an overpressure event occurs?
Under pressurization - Answer-What causes lack of gas at an appliance?
Under pressure - Answer-What kind of pressure can damaged control lines at regulator
stations cause?
Under pressure - Answer-Broken gas lines or other damage by construction may
cause?
Shut off gas supply and contact appropriate company personnel - Answer-What two
steps should you follow if an under pressure event occurs?
Pipeline masking - Answer-No gas odor due to ____________________
____________________ needs to be reported.
Shut off meters to affected customers and contact appropriate company personnel -
Answer-If you encounter an abnormal operating condition that is related to gas service
to a customer, what two things should you do?
