NATE/ICE Exam Gas & Oil Forced-Air and Hot-Water Heating Systems. Top Questions & Answers. Verified.
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NATE/ICE Exam Gas & Oil Forced-Air and Hot-Water Heating Systems. Top Questions & Answers. Verified.
What fuel is heavier than air?
LP gas
What is the heating value of natural gas (Methane→CH₄)?
1,000 btu/cu ft
What is the heating value of LP gas?
2,500 btu/cu ft
What 3 requirements ...
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NATE/ICE Exam Gas & Oil Forced-Air
and Hot-Water Heating Systems. Top
Questions & Answers. Verified.
What fuel is heavier than air?
LP gas
What is the heating value of natural gas (Methane→CH₄)?
1,000 btu/cu ft
What is the heating value of LP gas?
2,500 btu/cu ft
What 3 requirements are needed for combustion?
Oxygen, fuel, ignition
Complete combustion is accomplished when?
One part methane (CH₄) and two parts oxygen (O₂)
What are the two products of of complete combustion?
Carbon dioxide (CO₂) and water (H₂O)
Air is approximately:
21% Oxygen (O₂) and 79% Nitrogen (N₂)
Proper air-fuel mixture for complete combustion using natural gas (Methane→CH₄) is:
1 part fuel and 10 parts air
To ensure complete combustion you should add:
An additional 5 parts of excess air added to the fuel-air mixture
What can cause carbon monoxide (CO) during the combustion process?
Incomplete combustion and flame impingement on the cold surface of the heat exchanger
Natural gas is also called
Methane→CH₄
What are the methods of heat transfer?
,Conduction, convention, radiation
What is the maximum allowable CO (carbon monoxide) in flue gases of a furnace?
400 PPM
What is the maximum allowable concentration of CO (Carbon monoxide) for CONTINUOUS 24-hr
exposure according to ASHRAE?
009 PPM
Where should CO measurements be taken while testing a gas-fired furnace?
In the vent pipe leaving the furnace, around the burner area, and draft diverter
A common percentage of Carbon Dioxide (CO₂) in the flue gases of natural gas furnace ranges from:
7-9%
What is the purpose of a pilot?
It ignites the main burners
What type of pilot sensor is used on a standing pilot furnace?
A thermocouple
What is the purpose of a thermocouple?
It proves the existence of a pilot flame
How far must the tip of the thermocouple be placed in the pilot flame?
3/8" - 1/2"
How many millivolts does a thermocouple produce?
30 millivolts
How many millivolts does a power-pile produce?
750 millivolts
What three components make up a spark ignition system?
An ignition transformer, a cable, and an electrode
In a furnace that uses an intermittent pilot:
The pilot is lit w/each cycle of the furnace
An intermittent pilot system uses:
A spark or hot surface igniter to light the pilot
What is another name for a hot surface igniter?
, A silicon carbide igniter
Which of the following would be the quietest ignition system?
A hot surface igniter
The voltage of a hot surface igniter can be:
120 volts AND 24 volts
What type of pilot is commonly used on a direct ignition system?
Pilots are NOT used on a direct ignition systems
What is the setting of the spark gap on a spark ignition system?
1/8"
How far must the tip of the flame igniter/sensor be placed from the main burner or pilot flame?
3/8" - 1/2"
The voltage created by an ignition control module is commonly in the range of ?
7,000 - 15,000 volts
What are four common furnace designs?
Upflow, Downflow, Horizontal, and Multipositional
Which of the following are NOT located on a combination gas valve?
A spark igniter and sensor wire
What is the purpose of the pressure regulator that is located on a combination gas valve?
It takes an incoming gas pressure of 7" WC then reducing it to 3.5" AND it increases the pressure when
the screw is turned clockwise
What component is located in the gas manifold that is used to distribute gas to each burner?
An orifice
What is the purpose of PRIMARY air?
Air needed for proper combustion AND it mixes w/the main burner fuel BEFORE the point of ignition
What is SECONDARY air?
Air that mixes w/the main burner fuel AT THE POINT of ignition, ensuring proper combustion
In what part of the burner does air and fuel mix BEFORE combustion?
The venturi
If gas burners are not installed properly, what problem could this cause?
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