Name: 
 

Chapter 15



True/False
Indicate whether the sentence or statement is true or false.
 

 1. 

Natural gas is heavier than air.
 

 2. 

Natural gas has a natural garlic-like smell.
 

 3. 

The spud orifice on a natural gas furnace is larger than the spud orifice on an L.P. gas furnace.
 

Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

 4. 

What three elements bond together to form aldehydes?
a.
carbon, hydrogen, and water vapor
c.
carbon, hydrogen, and oxygen
b.
carbon, nitrogen, and oxygen
d.
carbon dioxide, hydrogen, and oxygen
 

 5. 

Which products of combustion are toxic?
a.
carbon dioxide
d.
both a and c
b.
aldehydes
e.
both b and c
c.
carbon monoxide
 

 6. 

L.P. gas has a heat content of ____ Btu/cu.ft.
a.
1000
c.
3200
b.
1050
d.
5000
 

 7. 

L.P. gas has a boiling temperature of ____ degrees at atmospheric pressure.
a.
0
c.
-40
b.
-20
d.
-50
 

 8. 

Conventional 80% efficient gas furnaces have a flue temperature of ____ degrees F.
a.
100
c.
400
b.
200
d.
600
 

 9. 

When troubleshooting a gas furnace, the technician reads 0 volts at the gas valve solenoid coil during a call for heat. What would not be the problem?
a.
defective gas valve
d.
open limit switch
b.
defective room thermostat
e.
defective blower motor
c.
defective induced draft motor
 

Short Answer
 

 10. 

List four types of ignition on residential gas furnaces.
 



 
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