Gas Questions Test Flashcards
A reading of 7.0’W.C is equal to in PSIG?
1/4 PSIG
Atmospheric pressure at sea level, what is the boiling point of water?
212F(100C)
True or False
By definition, the specific gravity of a gas(vapour) is; The weight of the gas as compared to the weight of air.
False,
The weight of the gas as compared to the weight of an equal volume of air
True or False,
The specific gravity of propane is heavier than that of air?
True, Propane has a specific gravity of 1.52 w.c
2.4% -9.5% is the lower and upper flammable limit of..?
Propane
The approximate heat content of 1 cubic foot of propane is..?
2,500btu
Natural gas and propane are mainly made of…
Carbon and Hydrogen
True or false,
The flame temperature of propane is approximately 3,650C
False, its 3,650F
True or False,
The igniton temp of propane is approx. 920F-1020F
True, or 493C-549C
True or False,
The boiling temp of propane is 44F
False, the boiling temp is -44F
When propane changes from a liquid to a vapour it expands and volume increases how many times?
270 times
True or False,
One imperial gallon of propane weighs 5.1lbs.
True
How many btu’s does one pound of propane release when it burns?
21,600btu’s
The products of combustion are primarily composed of…?
H20,CO2, and Heat
Water, Carbon Dioxide, and Heat
True or False,
As the temoerature of propane increases so does the pressure?
True, in a sealed container as the temperature of a medium increases so doth the pressure.
The amount of CO2 produced by burning one cubic foot of propane is..?
3 cubic feet
How much air is required to perfectly burn one cubic foot of propane?
23.5 cubic feet
The air found in the products of combustion after complete combustion is called?
Excess air
Air mixed with gas prior to combustion is called?
Primary Air
Air that is mixed with the air fuel mixture at the point of combustion is so called?
Secondary Air
Carbon monoxide is the product of the incomplete combustion of..?
A hydrocarbon
True or False,
The air you breath is composed mostly of 80% Oxygen, and 20% nitrogen.
False, its composed mainly 80% Nitrogen and 20% Oxygen.
A luminous flame is caused by…?
Not premixing air and fuel prior to combustion.
A bunsen flame is cause by..?
Premixing the fuel and air prior to combustion.
True or False,
The max flame temp of natural gas is much lower than that of propane.
False, they are both approximately 3600F
True or False,
The Theoretical boiling point of natural gas at atmospheric pressure is -259F
True, or -162C
How much air is required to burn of one cubic foot of Natural Gas?
10 cubic feet of air is required.
True or False,
Sulfur is added to natural gas and propane to aid in olfactory detection.
False, mercaptan is added for detection purposes.
The specific gravity of natural gas is..?
0.55(0.60),
Lighter than that of air
What are the major constituents of flue gases after proper combustion?
Carbon dioxide(CO2),
Dihydrogen Monoxide(H2O),
Nitrogen(N2),
Oxygen(O2),
and Heat
The two main Hydrocarbons in Natural Gas is…?
Methane, and Ethane
Carbon Monoxide is produced through…?
Incomplete Combustion
If you adjust a natural gas flame to produced just 10% more Carbon Dioxide you may….?
Produce Carbon Monoxide
True or False,
Adding more primary air you’ll get superior effeciency.
False, youll produce flame lift.
Both Carbon Dioxide and Nitrogen are….?
Inert
True or False,
Natural Gas is primarily made of 85-90% Ethane.
False, it is made of 85-90% Methane.
One boiler horsepower is approximately how many BTUh?
34,000 Btuh’s or 10 KW
Two undesirables of incomplete combustion are…?
Aldehydes and Carbon Monoxide.
The relative density of LIQUID propane is….
Lighter, 0.51 of water.
What is combustion air?
The air required for satisfactory combustion of a gas with excess air.
How far should be the base of a ladder is from the building if the ladder is 36 feet high?
12ft
What does MSDS stand for?
Material safety data sheet
A ladder must extend above roof landing by?
36
Who is the testing agency that certifies venting?
ULC
Underwriters labratory of Canada
What is needed to start combustion?
heat, air, fuel
What is the air needed to operate a gas appliance safely?
Combustion air, (Primary, Secondary, Excess air), dilution air
What is air comprised of?
80% nitrogen 20% oxygen
What type of air is premixed with gas prior to ignition?
Primary air
What type of air surrounds the flame for combustion?
Secondary air
What is the maximum filling density of propane containers?
80%
