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Propane and Natural Gas Exam Latest Update
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Propane and Natural Gas Exam LatestUpdate
If an appliance cannot be converted to another fuel ex. propane to
natural gas, it must be a ___ appliance - ANSWER "Dedicated"
Appliance
The "10ft-2ft-3ft" rule is a reference to what? - ANSWER It means
that chimneys must be 3ft above the highest point of where it passes
through, while still being 2ft higher than any portion of roof within
10ft
How many feet must a type B or L vent terminate, at minimum, above
the highest connected appliance draft hood or flue collar? -
ANSWER 5 feet
A gas vent (B or L) must terminate atleast ___ft above a forced air
inlet located within ___ft - ANSWER A gas vent (B or L) must
terminate at least 3ft above a forced air inlet located within 10ft
Two ways CSST or copper tubing can be installed inside hollow walls
or partitions if it is concealed? - ANSWER 1) Installed in single
runs that are not rigidly secured
2) With steel striker barrier, minimum 16 gauge*, barrier extends 4"
*1.3mm or .0508" thick
What is the minimum pressure for a pressure test? - ANSWER 1
1/2 times max working pressure, never less than 3 psi
What is the minimum duration for a pressure test? - ANSWER 10
minutes
What is the chemical formula of propane? - ANSWER C3H8
What is the specific gravity of liquid propane? - ANSWER .504
,What is the specific gravity of vapor propane? - ANSWER 1.50
What is the boiling point of propane? - ANSWER -44 F
What is the ignition temperature of propane? - ANSWER 920 F
What is the upper flammability limit of propane? - ANSWER 9.60%
What is the lower flammability limit of propane? - ANSWER 2.15%
What is the combustion ratio of propane? - ANSWER 24 to 1
How many BTU per cubic foot of propane vapor? - ANSWER 2488
btu
How many BTU per gallon of propane? - ANSWER 91,502 btu
What is the chemical formula of natural gas? - ANSWER CH4
What is the specific gravity of liquid natural gas? - ANSWER .30
What is the specific gravity of natural gas vapor? - ANSWER .60
What is the boiling point of natural gas? - ANSWER -260 F
What is the ignition temperature of natural gas? - ANSWER 1,150 F
What is the upper limit of natural gas? - ANSWER 14%
What is the lower limit of natural gas? - ANSWER 4%
What is the ideal combustion ratio natural gas? - ANSWER 10 to 1
How many BTU per cubic foot of natural gas? - ANSWER 1000 btu
What is a furnace plenum? - ANSWER A chamber constructed of
duct work attached to inlet or outlet of furnace with one or more
ducts connected to it
A drip (leg) is placed where and to collect what? - ANSWER A drip
(leg) is placed at the lowest point of system piping, in order to collect
condensate (which can then be removed), should not be placed
where condensate could freeze
,*Also at outlet of meter in some cases
Which device would turn on or off an appliance's gas supply in
response to changes in pressure, temperature, or liquid level? -
ANSWER A limit control
Condensate separates from flue gas due to either a reduction of ___
or an increase in ___ - ANSWER Condensate is created either
through a reduction of temperature or an increase in pressure
What is the difference between a type 1 and type 2 clothes dryer? -
ANSWER A type 1 dryer is for family living
A type 2 dryer is for business/public
What is a BTU? - ANSWER British Thermal Unit, quantity of heat
needed to raise 1 pound of water 1 degree fahrenheit
What are the maximum temperature and pressure in a low pressure
water boiler? - ANSWER A low pressure water boiler has a
maximum water temperature of 250 F and pressure of 160 psi
What are the maximum pressure in a low pressure steam boiler? -
ANSWER 15 psi
Two characteristics of a Category IV Vented Appliance? - ANSWER
1) Positive Pressure
2) Excessive Condensate
Two characteristics of a Category III Vented Appliance? - ANSWER
1) Positive Pressure
2) AVOIDS Excessive Condensate
Two characteristics of a Category I Vented Appliance? - ANSWER
1) NON Positive Pressure
2) AVOIDS Excessive Condensate
What is the difference between accessible and readily accessible? -
ANSWER Accessible requires removal of panel WHILE readily
, accessible means no panel
Where must a sediment trap be installed, what is it made of, and what
is the minimum length? - ANSWER A sediment trap is located
downstream of an appliance shut off,
it is made of a capped nipple off a tee,
at a minimum length of 3 inches
If the height of a passageway is less than 6 feet tall, the distance from
passageway to appliance is maximum... - ANSWER 20 feet
What is the minimum amount of cover for an underground piping
system? And what is an exception? - ANSWER The minimum
amount of cover is 12 inches
An exception is if there is a likely possibility of external damage, 18
inches is the minimum cover
Why can't a 4 inch draft hood be reduced to a 3 inch vent? -
ANSWER Because in order to reduce vent size, the draft hood must
be more than 4 inches
If a draft hood outlet or flue collar is 12 inches or more, what is the
maximum number of sizes a vent can be reduced? - ANSWER 2
sizes
If a draft hood outlet or flue collar is 12 inches or less, what is the
maximum number of sizes a vent can be reduced? - ANSWER 1
size
What is the maximum BTU for an unvented room heater in a
bathroom? - ANSWER 6,000 btu
What is the maximum BTU for an unvented room heater in a
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