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Gas Fitters > Unit 1 Properties Of Nat. Gas And Propane > Flashcards

Unit 1 Properties Of Nat. Gas And Propane Flashcards

1
Q

Natural gas is composed of several component gases. The main component gas is ________ and its percentage is _______%

A

Methane

90%

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2
Q 
Natural gas (sweet) is 
A) non toxic 
B) tasteless, colourless, and invisible 
C) odourless (if an operant is not added 
E) all of the above
A

E) all of the above

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3
Q 
Methane 
Chemical structure\_\_\_\_\_\_\_\_\_\_\_
Specific gravity\_\_\_\_\_\_\_\_\_\_\_sp.g
Expansion factor\_\_\_\_\_\_\_\_\_
Boiling temp\_\_\_\_\_\_\_\_\_\_\_•F
Calorific Value\_\_\_\_\_\_\_\_btu/ft3
A 
Chemical structure-CH 4
Specific gravity-0.6 sp.g
Expansion factor-  600:1
Boiling temp- -258 •F
Calorific Value- 1000 btu/ft3
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4
Q 
Propane
Chemical structure\_\_\_\_\_\_\_\_\_\_\_
Specific gravity\_\_\_\_\_\_\_\_\_\_\_sp.g
Expansion factor\_\_\_\_\_\_\_\_\_
Boiling temp\_\_\_\_\_\_\_\_\_\_\_•F
Calorific Value\_\_\_\_\_\_\_\_btu/ft3
A 
Chemical structure- C3 H8
Specific gravity- 1.52 sp.g
Expansion factor- 270:1
Boiling temp- -44 •F
Calorific Value- 2540 btu/ft3
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5
Q

Density is the:
A) weight of a gas compared to the weight of an equal volume of air
B) volume of of a gas compared to the weight of an equal volume of air
C) weight per volume of a substance

A

A) weight of a gas compared to the weight of an equal volume of air

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6
Q

Specific gravity is the:
A) weight of a gas compared to the weight of an equal volume of air
B) volume of of a gas compared to the weight of an equal volume of air
C) weight per volume of a substance

A

C) weight per volume of a substance

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7
Q

Specific gravity is known as _________density

A

Relative

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8
Q

The specific gravity of liquid propane is __________

A

0.509??

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9
Q

The vapour density of propane in vapour form is _____

A

1.52

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10
Q

One imperial gallon of liquid propane is _________lbs

A

5.10 lbs

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11
Q

One pound of liquid propane will produce _________cu/ft vapour

A

8.5 cu/ft vapour

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12
Q

The heat content of of 1 cu/ft of natural gas is _______btus

A

1000 btus

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13
Q

Why is mercaptan added nat. Gas and propane ?

A

To add sent for safety

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14
Q

Carbon dioxide (CO 2) and nitrogen are considered to be________

A

Inert gasses

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15
Q

One cu/ft of natural gas requires ____cu/ft of combustion air

A

10 cu/ft

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16
Q

One cu/ft of propane requires ____cu/ft of combustion air

A

25 cu/ft

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17
Q

Natural gas and propane are part of what family

A

Hydro carbons

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18
Q

What is the name of the operant that is added to natural gas and propane

A

Mercaptan

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19
Q

The boiling point of propane at atmospheric pressure is -____•F

A

-44•F

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20
Q

The specific gravity of natural gas is ______sp•g

A

0.6 sp•g

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21
Q

The explosive limits of natural gas are stated as falling within the range of ________

A

4%~ 14%

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22
Q

the definition of of relative density (specific gravity) of gas is stated as :

A

a gas’s weight compared to the weight of an equal volume of air

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23
Q

the approximate ignition temperature of natural gas is __________

A

1200 degrees F

24
Q

the flame temperature of natural gas is approximately ________

A

3500 Degrees F

25
when propane changes from a liquid to a vapor, its volume increases ______times
270 times
26
the heat content of 1 cubic foot of propane vapor i approximately _________BTUs
2540 BTUs
27
2.4 to 9.4 is the explosive limits of ________
Propane
28
the flame temperature of propane is approximately _______F
3600 degrees F
29
air contains approximately____% Nitrogen and ___% oxygen
20 %nitrogen and 80% oxygen
30
What are two classifications of combustion air
primary, and secondary Air
31
efficient and safe operations of gas fired appliances relies on what three main air supply categories
combustion , excess and dilution air.
32
air premixed with fuel prior to combustion is known as
primary air
33
premixing air and fuel prior to combustion will produce a ________flame
Blue (Bunsen)
34
what are the properties of carbon-monoxide (CO)
tasteless, colourless, odorless, combustible, and toxic
35
which are symptoms of Carbon-Monoxide (CO) poisoning? a) headaches b) dizziness, Confuson c) rapid heart rate , death d) all of the above
d) all of the above
36
calculate the volume of combustion air required, for a gas fired appliancewith an 80,000 Btuh imput
80,000btuh=80 BTU | 80 BTU *10 cf/BTU =800 cf
37
calculate the volume of combustion air required for a propane fired appliance with an input of 250,000 BTUH
250,000 Btuh=250 BTU | 250 BTU * 10 cf/ btu =2,500 cf
38
a luminous flame emits no visible light. true of false
False
39
what is the primary cause of incomplete combustion?
Lack of Primary Air.
40
Primary Air is defined as__________
air mixed with fuel prior to combustion
41
secondary Air is defined as _______
Air added after ignition.
42
Excess air is supplied to the combustion zone to ensure _________ has occured
Complete Combustion
43
Excess Gas pressure could be the cause of a lifting flame. True or false
true
44
two undesirable products of incomplete combustion are ___________ and _________
carbon monoxide and Hydrogen (also aldahides )
45
Dilution Air air is defined as _____________
ambient air inserted after combustion
46
a luminous flame is caused by_________
a lack of primary air
47
what are two main differences between leak involving natural gas and propane
Gas will Rise where propane will drop to floor level
48
the main constitutes of flue gasses after proper combustion are a) CO, H20, N2,excess air and heat b) H20, N2, Primary air and heat c) CO2, H20 N2 O2,and heat d) O2, CO, N2, H2O and heat
c)CO2, H20 N2 O2,and heat
49
__________is a product of incomplete combustion.
Carbon Monoxide
50
Theoretically _____ cu/ft of air is required to completely burn ____cu/ft of natural
10 | 1
51
Theoretically _____ cu/ft of air is required to completely burn ____cu/ft of Propane
25 | 1
52
Carbon monoxide is a toxic and combustible gas true of false
true
53
how many cu/ft of carbon dioxide is produced when burning one cu/ft of
3 cu\ft of carbon dioxide
54
as the temperature of liquid propane increases, the vapour pressure of the propane ________(increases/decreases)
increases
55
how will each of these gasses effect the body a)carbon dioxide CO2 B) carbon monoxide C0
a)carbon dioxide-nothing | B) carbon monoxide- kill you

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