Gas Combustion
Gas Combustion
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Question 1 |
What fuel is heavier than air?
A | Natural gas |
B | LP gas |
C | Ethane |
D | None of the above |
Question 2 |
What is the heating value of natural gas?
A | 800 btu/cu ft |
B | 1,000 btu/cu ft |
C | 1,500 btu/cu ft |
D | 2,500 btu/cu ft |
Question 3 |
What is the heating value of LP gas?
A | 800 btu/cu ft |
B | 1,000 btu/cu ft |
C | 1,500 btu/cu ft |
D | 2,500 btu/cu ft |
Question 4 |
What are the three requirements needed for combustion?
A | Carbon, oxygen and ignition |
B | Air, carbon, and fuel |
C | Fuel, carbon, and ignition |
D | Oxygen, fuel, and ignition |
Question 5 |
Complete combustion is accomplished when
A | One part methane is combined with two parts oxygen |
B | Two parts methane are combined with one part oxygen |
C | One part carbon is combined with two parts methane |
D | Two parts carbon are combined with one part methane |
Question 6 |
What are two products of complete combustion?
A | CO and H2O |
B | CO2 and H2O |
C | CH4 and O2 |
D | CH4 and H2O |
Question 7 |
Air is approximately
A | 21% oxygen and 79% nitrogen |
B | 51% oxygen and 49% nitrogen |
C | 70% oxygen and 21% nitrogen |
D | 49% oxygen and 51% nitrogen |
Question 8 |
The proper air and fuel mixture for complete combustion is
A | 1 part fuel and 1 part air |
B | 1 part fuel and 4 parts air |
C | 1 part fuel and 8 parts air |
D | 1 part fuel and 10 parts air |
Question 9 |
To ensure complete combustion,
A | An additional 2 parts of excess air is added to the fuel air mixture |
B | An additional 5 parts of excess air is added to the fuel air mixture |
C | An additional 10 parts of excess air is added to the fuel air mixture |
D | An additional 15 parts of excess air is added to the fuel air mixture |
Question 10 |
What can cause carbon monoxide during the combustion process?
A | Incomplete combustion and flame impingement on the cold surface of a heat exchanger |
B | Not enough fuel mixture and leaks in the vent pipe |
C | Too much primary air and incomplete combustion |
D | Too much primary and secondary air |
Question 11 |
Natural gas is also known as
A | Butane |
B | Propane |
C | Methane |
D | None of the above |
Question 12 |
What are three methods of heat transfer?
A | Evaporation, radiation, and convection |
B | Convection, air motion, and conduction |
C | Conduction, convection, and radiation |
D | Condensation, convection, and conduction |
Question 13 |
What is the maximum allowable CO in flue gases?
A | 200ppm |
B | 400ppm |
C | 600ppm |
D | 800ppm |
Question 14 |
What is the maximum allowable concentration of CO for continuous 24hr exposure, according to ASHRE?
A | 009ppm |
B | 02ppm |
C | 050ppm |
D | 80ppm |
Question 15 |
Where should CO measurements be taken while testing a gas fired furnace?
A | In the vent pipe only |
B | Only around the burner |
C | At the draft diverter on a 90% efficient furnace |
D | In the vent pipe leaving the furnace and around the burner area and draft diverter |
Question 16 |
A common percentage of CO2 in the flue gases of a natural gas furnace ranges from:
A | 4 to 6% |
B | 7 to 9% |
C | 11 to 12% |
D | 14 to 15% |
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