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ERZ Studies. > 05---Friday---Gasses Questions 1 > Flashcards

05---Friday---Gasses Questions 1 Flashcards

1
Q

With a volumetric type sensor what effects will an higher reading of CO2 than normal have on the O2 reading?

A

The presence of CO2 at 1% will have an increased reading of 0.1% O2 P 182 black rescue book

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2
Q

Is a volumetric sensor affected by variations in atmospheric pressure?

A

No it is not affected by altitude , pressure, Temperature or relative humidity

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3
Q

How is nitrogen detected in Queensland?

A

Gas Chromatograph

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4
Q

What is the formulae for CO make?

A

CO make in Litres= 0.06 x PPM C0 x M3/sec ventilation flow

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5
Q

what is Grahams ratio?

A

This is the ratio of CO produced to O2 consumed and is directly proportional to the temp of the coal

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6
Q

What is morris ratio?

A

it is a measure of the amount of O2 absorbed by the coal and the amount of oxidation produced

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7
Q

What is Carbon monoxide / carbon dioxide ratio?

A

It is based on the change in ratio of CO produced to CO2 produced as a function of the coal temp.

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8
Q

What is the nose point for Methane?

A

12.2-O2 5.9-CH4

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9
Q

Where is nitrogen stored underground?

A

Behind seals / Transormer Tanks

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10
Q

What is meant by lag of ignition?

A

The gas must be in contact with the heat source for a definate time for the ignition to take place.

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11
Q

What are the main processes used to detect Methane? 3 listed

A

Catalytic oxidation, Thermal conductivity, Infrared

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12
Q

Which Process is more suitable when O2 is deficient or other gasses are present?

A

Infrared techniques

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13
Q

What is the normal measurement range for the wheatstone bridge or pellister catalytic oxidation principle?

A

0 to 5 % XAM 5000

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14
Q

Name two methods portable for detecting Co underground?

A

Tube detectors Electrochemical sensor

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15
Q

Is the electrochemical sensor used to detect Co cross sensitive to other gases?

A

Yes it is cross sensitive to Hydogen, ethylene and hydrogen sulphide. (Black rescue book page 150)

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16
Q

How will the lack of O2 affect the reading using a electrochemical sensor when sampling carbon Monoxide?

A

The sensor requires O2 to be able to oxidise the Gas

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17
Q

Name one sensor used to dectect CO” Must be portable?

A

Infrared cell portable detector 0 to 5 %

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18
Q

Why is hydrogen not suitable for testing by the electrochemical sensor?

A

Because of the cross sensitivities encounted by hydrogen cell make it unsuitable for use in mining.

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19
Q

At what percentage of oxygen does all Flamable liquids cease to burn?

A

16%

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20
Q

At what percentage of oxygen does all Flaming combustion cease?

A

12.50%

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21
Q

At what percentage does all combustion cease?

A

2%

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22
Q

How much O2 is present in normal Air?

A

20.93 by volume

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23
Q

What effect does an atmosphere enriched with oxygen have on the UEL of Flammable Gases?

A

Reduces the Explosive limit

24
Q

What effect does Nitrogen have on the Human body in normal Atmosphere?

A

It has no effect on the Human body at normal atmospheric Pressure

25
Q

Will nitrogen support life?

A

No

26
Q

Where is nitrogen stored underground in a coal mine?

A

Transformers

27
Q

Why is correct nitrogen pertentage critical/important in grahams ratio?

A

GGGGG

28
Q

What is the minimum concentration of Oxygen for a methane explosion.

A

12.40%

29
Q

What is the most easily ignited mixture of methane in air (by electric arc)?

A

7 to 8 %

30
Q

Methane has a lag long time when compaired to most other gasses What is the lag time for 5 to 6% of methane/air mixture?

A

Two seconds

31
Q

State the methane legal limits for Men withdrawn?

A

2.50%

32
Q

State the methane legal limits for Diesel machinery shut down?

A

1.25

33
Q

State the methane legal limits for diesel vehicles withdrawn?

A

1.00%

34
Q

State the methane legal limits forPower disconnected?

A

2.00%

35
Q

State the methane legal limits for Face Machinery Shearer ?

A

Face Machine 1.25% trips cutters to Longwall Shearer 2% trips all power to Longwall shearer

36
Q

State the methane legal limits for Face Machinery Miner ?

A

Continuious miner, coal cutter, Tunnel boring, power trip ABM25 2%

37
Q

State the methane legal limits for Auxillary Fan Power up?

A

less than 2%

38
Q

What effect does high concentrations of CO2 have on the central nervous system?

A

It depresses the central nervous system

39
Q

What effect does low CO2 percentages have on the Body?

A

Its a stimulant to the Central Nervous System and to the Respiratory system i.e.it makes you breath.

40
Q

How much more soluble is carbon dioxide absorbed into the blood than oxygen?

A

20 Times

41
Q

What does the term hypoxia mean ?

A

Lack of oxygen

42
Q

What gasses and percentages does carbogen contain?

A

Oxygen 96% carbon dioxide 4%

43
Q

What is Carbogen used for?

A

Resusitation /refrigeration/fire extinguishers

44
Q

What is the most explosive concentration of Carbon monoxide?

A

29%

45
Q

Where is CO2 generated or found in a coal mine. Name 4 places

A

Breating, afterdamp, Blackdamp, coal seam gas, mine fires, explosions , diesel fumes.

46
Q

Is CO2 soluble in water?

A

Yes quite soluble in water

47
Q

What is the chemical symbol for hydrogen?

A

H2

48
Q

What is the Specific gravity for CO2

A

1.53

49
Q

What is the nose point for methane

A

12.2 O2 5.9 CH4

50
Q

What is ther nose point for Hyrogen?

A

5.1 O2 4.3 H2

51
Q

What is the nose point for Carbon Monoxide?

A

6.1 O2 13.8 CO

52
Q

When taking a bag sample how full should the bag be?

A

3/4 capacity

53
Q

Sample tubes into stopped off areas should extend how many meters into the goaf

A

100m

54
Q

When should samples be taken from stoppings?

A

When the barometer is falling

55
Q

When a sample Bag has tested for what gas will it have to be destroyed?

A

Hydrogen

56
Q

Describe how you would take a sample from a tube extending 100m into a stopped off area?

A

Ensure that the sample tube is flushed at least 3 times the internal diameter

57
Q

List the information to be detailed on a sample tag?

A

Where the sample was taken, Date, Time, Barometer Reading, Spot or General sample, Other Information

ERZ Studies. (29 decks)

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