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AV > Properties Of Gas And Principles Of Combustion > Flashcards

Properties Of Gas And Principles Of Combustion Flashcards

1
Q

Name the three states of matter

A

Liquid
Gas
Solid

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2
Q

What are the characteristics of a liquid state

A

A liquid state has a definite volume and definite weight but no definite shape of their own but will take the shape of the container holding them

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3
Q

what two factors influence the state that matter exists in?

A

temperature and pressure

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4
Q

Define specific gravity as it applies to solids or liquids.

A

It is the comparison of a volume of a substance (liquid or solid ) compared to an equal volume of water.

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5
Q

the specific gravity of water is

A

1

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6
Q

how many times is mercury heavier than water

A

13.6 times heavier than water

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7
Q

define specific gravity as it applies to vapour

A

specific gravity as it applies to vapour it is compared to air

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8
Q

what is the density of air at STP

A

air is 0.076

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9
Q

state the density of water in the following units and state the specific gravity

lb/cu ft

A

62.4

1

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10
Q

state the density of water in the following units and state the specific gravity
lb/gas

A

10

1

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11
Q

state the density of water in the following units and state the specific gravity
lb/cu in

A

0.0361

1

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12
Q

state the density of water in the following units and state the specific gravity

oz/cu in

A

0.578

1

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13
Q

state the density of water in the following units and state the specific gravity

lb/us gal

A

8.33

1

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14
Q

What gas has a Calorific value of

2500

A

methane

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15
Q

what gas has a Calorific value of 1000btu/cu ft

A

propane

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16
Q

what gas has a Calorific value of 3200 btu/cu ft

A

butane

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17
Q

define btu

A

the amount of heat required to raise the temperature of 1 lb of water 1F

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18
Q

boiling point of propane liquid

A

-44F

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19
Q

boiling point of butane liquid

A

32F

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20
Q

Boiling point of water

A

212F

21
Q

boiling point of liquefied natural gas

A

258F

22
Q

what is the density of water in lb/cu ft

A

62.4

23
Q

what is the density of air in lb/cu ft

A

0.076 lb / cu ft

24
Q

the specific gravity of natural gas

A

0.6

25
Q

the specific gravity of liquid propane

A

.51

26
Q

how many cubic feet of gas are contained in one gallon of propane liquid

A

43.6

27
Q

how many cubic feet of gas are contained in one gallon of water

A

272

28
Q

list the main gas present in the atmosphere according to the following % that they represent the atmosphere

20%
79%
1%

A

oxygen
nitrogen
other gases

29
Q

when burning gas what is significant of the filling temp 3500F

A

flame temperature of propane

30
Q

when burning gas what is significant of the filling temp 950F

A

ignition temperature of propane

31
Q

when burning gas what is significant of the filling temp 1200F

A

ignition temperature of natural gas

32
Q

when burning gas what is significant of the following temp 3350°F

A

flame temperature of natural gas

33
Q

when burning gas what is significant of the following temp 825°F

A

ignition temperature of butane

34
Q

when burning gas what is significant of the following temp 3450°F

A

flame temperature of butane

35
Q

Define the term combustion

A

The rapid oxidation of a fuel resulting in the production of heat or heat and light .

36
Q

combustion air

A

the air required to completely burn the fuel

37
Q

primary air

A

air required for the initial stages of the combustion process and is mixed with fuel prior to combustion

38
Q

secondary Air

A

air required for the intermediate and final stages of the combustion process and is added to the flame to produce complete combustion

39
Q

excess Air

A

air supplied for the combustion process in excess of but not required theoretically

40
Q

combustion products

A

constituents resulting by uniting fuel with oxygen. this usually thought of as being gad primary and secondary Air

41
Q

range of flammability

A

the % of gas present in a gas/air mixture between the upper and lower limits that will burn

42
Q

incomplete combustion

A

combustion that does not convert all the carbon and/or hydrogen in water vapour and/or carbon dioxide

43
Q

lift off

A

the gas/air mixture speed exceeds the flame speed resulting in a flame that burns to high above the burner

44
Q

flashback

A

the gas/air mixture is slower than the flame speed causing the flame to burn inside the burner possibly at the orifice

45
Q

what flame colour is most likely to indicate poor combustion

A

yellow

46
Q

what flame colour usually indicates dust or dirt passing through the flame

A

orange

47
Q

what colour of flame indicates good combustion

A

light blue

48
Q

what are 4 symptoms associated with carbon monoxide poisoning

A

headache
short of breath
dizziness
confusion

AV (4 decks)

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