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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
Q

when propane changes from a liquid to a vapor, its volume increases ______times

A

270 times

26
Q

the heat content of 1 cubic foot of propane vapor i approximately _________BTUs

A

2540 BTUs

27
Q

2.4 to 9.4 is the explosive limits of ________

A

Propane

28
Q

the flame temperature of propane is approximately _______F

A

3600 degrees F

29
Q

air contains approximately____% Nitrogen and ___% oxygen

A

20 %nitrogen and 80% oxygen

30
Q

What are two classifications of combustion air

A

primary, and secondary Air

31
Q

efficient and safe operations of gas fired appliances relies on what three main air supply categories

A

combustion , excess and dilution air.

32
Q

air premixed with fuel prior to combustion is known as

A

primary air

33
Q

premixing air and fuel prior to combustion will produce a ________flame

A

Blue (Bunsen)

34
Q

what are the properties of carbon-monoxide (CO)

A

tasteless, colourless, odorless, combustible, and toxic

35
Q

which are symptoms of Carbon-Monoxide (CO) poisoning?

a) headaches
b) dizziness, Confuson
c) rapid heart rate , death
d) all of the above

A

d) all of the above

36
Q

calculate the volume of combustion air required, for a gas fired appliancewith an 80,000 Btuh imput

A

80,000btuh=80 BTU

80 BTU *10 cf/BTU =800 cf

37
Q

calculate the volume of combustion air required for a propane fired appliance with an input of 250,000 BTUH

A

250,000 Btuh=250 BTU

250 BTU * 10 cf/ btu =2,500 cf

38
Q

a luminous flame emits no visible light. true of false

A

False

39
Q

what is the primary cause of incomplete combustion?

A

Lack of Primary Air.

40
Q

Primary Air is defined as__________

A

air mixed with fuel prior to combustion

41
Q

secondary Air is defined as _______

A

Air added after ignition.

42
Q

Excess air is supplied to the combustion zone to ensure _________ has occured

A

Complete Combustion

43
Q

Excess Gas pressure could be the cause of a lifting flame. True or false

A

true

44
Q

two undesirable products of incomplete combustion are ___________ and _________

A

carbon monoxide and Hydrogen (also aldahides )

45
Q

Dilution Air air is defined as _____________

A

ambient air inserted after combustion

46
Q

a luminous flame is caused by_________

A

a lack of primary air

47
Q

what are two main differences between leak involving natural gas and propane

A

Gas will Rise where propane will drop to floor level

48
Q

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

A

c)CO2, H20 N2 O2,and heat

49
Q

__________is a product of incomplete combustion.

A

Carbon Monoxide

50
Q

Theoretically _____ cu/ft of air is required to completely burn ____cu/ft of natural

A

10

1

51
Q

Theoretically _____ cu/ft of air is required to completely burn ____cu/ft of Propane

A

25

1

52
Q

Carbon monoxide is a toxic and combustible gas true of false

A

true

53
Q

how many cu/ft of carbon dioxide is produced when burning one cu/ft of

A

3 cu\ft of carbon dioxide

54
Q

as the temperature of liquid propane increases, the vapour pressure of the propane ________(increases/decreases)

A

increases

55
Q

how will each of these gasses effect the body
a)carbon dioxide CO2
B) carbon monoxide C0

A

a)carbon dioxide-nothing

B) carbon monoxide- kill you

Gas Fitters (2 decks)

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