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Gas Level 3 HBA > Gas Questions Test > Flashcards

Gas Questions Test Flashcards

1
Q

A reading of 7.0’W.C is equal to in PSIG?

A

1/4 PSIG

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2
Q

Atmospheric pressure at sea level, what is the boiling point of water?

A

212F(100C)

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3
Q

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.

A

False,
The weight of the gas as compared to the weight of an equal volume of air

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4
Q

True or False,
The specific gravity of propane is heavier than that of air?

A

True, Propane has a specific gravity of 1.52 w.c

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5
Q

2.4% -9.5% is the lower and upper flammable limit of..?

A

Propane

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6
Q

The approximate heat content of 1 cubic foot of propane is..?

A

2,500btu

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7
Q

Natural gas and propane are mainly made of…

A

Carbon and Hydrogen

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8
Q

True or false,
The flame temperature of propane is approximately 3,650C

A

False, its 3,650F

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9
Q

True or False,
The igniton temp of propane is approx. 920F-1020F

A

True, or 493C-549C

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10
Q

True or False,
The boiling temp of propane is 44F

A

False, the boiling temp is -44F

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11
Q

When propane changes from a liquid to a vapour it expands and volume increases how many times?

A

270 times

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12
Q

True or False,
One imperial gallon of propane weighs 5.1lbs.

A

True

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13
Q

How many btu’s does one pound of propane release when it burns?

A

21,600btu’s

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14
Q

The products of combustion are primarily composed of…?

A

H20,CO2, and Heat
Water, Carbon Dioxide, and Heat

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15
Q

True or False,
As the temoerature of propane increases so does the pressure?

A

True, in a sealed container as the temperature of a medium increases so doth the pressure.

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16
Q

The amount of CO2 produced by burning one cubic foot of propane is..?

A

3 cubic feet

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17
Q

How much air is required to perfectly burn one cubic foot of propane?

A

23.5 cubic feet

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18
Q

The air found in the products of combustion after complete combustion is called?

A

Excess air

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19
Q

Air mixed with gas prior to combustion is called?

A

Primary Air

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20
Q

Air that is mixed with the air fuel mixture at the point of combustion is so called?

A

Secondary Air

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21
Q

Carbon monoxide is the product of the incomplete combustion of..?

A

A hydrocarbon

22
Q

True or False,
The air you breath is composed mostly of 80% Oxygen, and 20% nitrogen.

A

False, its composed mainly 80% Nitrogen and 20% Oxygen.

23
Q

A luminous flame is caused by…?

A

Not premixing air and fuel prior to combustion.

24
Q

A bunsen flame is cause by..?

A

Premixing the fuel and air prior to combustion.

25
Q

True or False,
The max flame temp of natural gas is much lower than that of propane.

A

False, they are both approximately 3600F

26
Q

True or False,
The Theoretical boiling point of natural gas at atmospheric pressure is -259F

A

True, or -162C

27
Q

How much air is required to burn of one cubic foot of Natural Gas?

A

10 cubic feet of air is required.

28
Q

True or False,
Sulfur is added to natural gas and propane to aid in olfactory detection.

A

False, mercaptan is added for detection purposes.

29
Q

The specific gravity of natural gas is..?

A

0.55(0.60),
Lighter than that of air

30
Q

What are the major constituents of flue gases after proper combustion?

A

Carbon dioxide(CO2),
Dihydrogen Monoxide(H2O),
Nitrogen(N2),
Oxygen(O2),
and Heat

31
Q

The two main Hydrocarbons in Natural Gas is…?

A

Methane, and Ethane

32
Q

Carbon Monoxide is produced through…?

A

Incomplete Combustion

33
Q

If you adjust a natural gas flame to produced just 10% more Carbon Dioxide you may….?

A

Produce Carbon Monoxide

34
Q

True or False,
Adding more primary air you’ll get superior effeciency.

A

False, youll produce flame lift.

35
Q

Both Carbon Dioxide and Nitrogen are….?

A

Inert

36
Q

True or False,
Natural Gas is primarily made of 85-90% Ethane.

A

False, it is made of 85-90% Methane.

37
Q

One boiler horsepower is approximately how many BTUh?

A

34,000 Btuh’s or 10 KW

38
Q

Two undesirables of incomplete combustion are…?

A

Aldehydes and Carbon Monoxide.

39
Q

The relative density of LIQUID propane is….

A

Lighter, 0.51 of water.

40
Q

What is combustion air?

A

The air required for satisfactory combustion of a gas with excess air.

41
Q

How far should be the base of a ladder is from the building if the ladder is 36 feet high?

A

12ft

42
Q

What does MSDS stand for?

A

Material safety data sheet

43
Q

A ladder must extend above roof landing by?

A

36

44
Q

Who is the testing agency that certifies venting?

A

ULC
Underwriters labratory of Canada

45
Q

What is needed to start combustion?

A

heat, air, fuel

46
Q

What is the air needed to operate a gas appliance safely?

A

Combustion air, (Primary, Secondary, Excess air), dilution air

47
Q

What is air comprised of?

A

80% nitrogen 20% oxygen

48
Q

What type of air is premixed with gas prior to ignition?

A

Primary air

49
Q

What type of air surrounds the flame for combustion?

A

Secondary air

50
Q

What is the maximum filling density of propane containers?

A

80%

51
Q
A

Gas Level 3 HBA (6 decks)

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