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G3 Exam Prep > Fuel Properties > Flashcards

Fuel Properties Flashcards

1
Q

Natural gas and propane are …

A

Members of the hydrocarbon family

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2
Q

Natural gas and propane are composed, mainly of

A

Carbon and hydrogen

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3
Q

What is the odorant added to natural gas and propane?

A

Mercaptan

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4
Q

85% to 95% of natural gas is composed of

A

Methane

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5
Q

The chemical formula for propane is

A

C3H8

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6
Q

The chemical formula for natural gas is

A

CH4

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7
Q

The chemical formula for carbon monoxide is

A

CO

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8
Q

The approximate percentage of oxygen and nitrogen in the air is

A

21% oxygen and 79% nitrogen

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9
Q

The lower and upper limit of flammability for natural gas is

A

4% to 15% of gas in the air

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10
Q

What is the heating value of natural gas in BTUs per cubic foot

A

1000 btu per cubic foot

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11
Q

What is the relative density or specific gravity of natural gas?

A

.64

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12
Q

what are the lower and upper limits of flammability for propane?

A

2.5% to 9.5% of gas in the air

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13
Q

What is the expansion rate from liquid to gas for propane?

A

270

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14
Q

Heating valve for propane in btu per cubic foot

A

2500 btu per cubic foot

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15
Q

What is the relative density or specific gravity of propane as a Gas?

A

1.52

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16
Q

What is L.E.L

A

The lowest percentage of gas in the air-gas mixture that will support combustion

17
Q

pipelines delivering gas to the end-user, are known as …

A

Distribution pipelines

18
Q

Is the ignition temperature of propane gas higher or lower than natural gas?

A

Lower for propane

19
Q

T or F

Propane has 2 1/2 times more heating value than natural gas

A

T

20
Q

natural gas is ____ than air, propane is ____ than air

A

lighter , heavier

21
Q

when 1 pound of propane burns, it releases, approximately

a) 2500 btu
b) 11700 btu
c) 21600 btu
d) 60000btu

A

c) 21600btu

22
Q

propane is a

a) manufactured gas
b) hydrocarbon
c) residential fuel
d) naphthalene fuel

A

b) hydrocarbon

23
Q

as the temperature of liquid propane in a tank increases, the vapour pressure of the propane

A

Increases

24
Q

One boiler horsepower is approximately

A

34,000 BTUs (10kw)

25
Q

The specific gravity of a gas (vapour) is

A

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

26
Q

the three elements required for combustion are…

A

fuel
heat
oxygen

27
Q

What part of an atom moves from one atom to the other

a) neutron
b) proton
c) molecule
d) electron

A

d) electron

G3 Exam Prep (5 decks)

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