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Question 1

Oxygen % explain the effects
16%~14%
14%~10%
10%~6%

Answer 1

16%~14% - Slight increase in pulse and breathing/ night and colour vision affected
14%~10% - Poor judgment/abnormal fatigue
10%~6% - Nausea/vomiting

Question 2

Explain the effect of the following CO2 Carbon Dioxide concentrations on a person:
2%
4.5%~5%
10%

Answer 2

a) 2%- 50% increase in lung ventilation
b) 4.5-5%- Anxiety, panic, irritability
c) 10%- Toxic, depresses CNS, violent panting, exhaustion, headache

Question 3

Gases that constitute normal air and percentages

Answer 3

Oxygen 20.94%
Nitrogen 78.11%
Carbon Dioxide.04%
Argon/Inert gases .93%
Water vapour 0-3%

Question 4

State the long term exposure limit concentrations for the following gases

Answer 4

Carbon monoxide 30 ppm
Hydrogen Sulphide 10 ppm
Nitrogen Dioxide 3 ppm
Sulphur Dioxide 2 ppm

Question 5

In regards to Carbon Monoxide poisoning what is meant by the term blood saturation

Answer 5

Blood becomes saturated with CO preventing the blood from taking on any more CO or O2

Question 6

Carbon monoxide poisoning is said to have a cumulative effect
What is meant by cumulative effect

Answer 6

CO can build up in a person from multiple small exposures making the person more susceptible to its affect

Question 7

How is Carbon Monoxide produced in coal mines

Give 4 examples

Answer 7

Spon com
Heating
Diesel exhaust
Oxidation

Question 8

Name 6 signs and symptoms that would be associated with Carbon Monoxide poisoning

Answer 8

Impaired vision night and colour vision affected 
Rosy flushed face
Irritability 
Heavy legs unsteady gait
Convulsions 
Death

Question 9

What effects does the increase in ambient temperature have on a flammable gas/air mixture

Answer 9

Makes it more easily ignited

Question 10

State where Hydrogen Sulphide could be found in a coal mine

Answer 10

Stagnant water Spon Com

Seam Gas

Question 11

State the physiological effects Hydrogen Sulphide has on a person

Answer 11

Has a narcotic effect on the central nervous system

Toxic poisonous gas that irritates the lungs and respiratory tract

Question 12

State the chemical and physical properties of Sulphur Dioxide

Answer 12

Toxic/colourless/sulphuric odour/acidic taste/non flammable/SG-2.2

Question 13

Where does Sulphur Dioxide occur in a coal mine

Answer 13

In coal containing Sulphur/Spon Com/Diesel exhaust

Question 14

Is Sulphur Dioxide a flammable gas.If so at what percentage

Answer 14

Non flammable and incombustible

Question 15

State the maximum exposure limit for Nitrogen Dioxide

Answer 15

STEL is 5 ppm

Question 16

How does Nitrogen Dioxide occur in a coal mine

Answer 16

Blasting operations /Blast Fume

Diesel exhaust

Question 17

State the physiological effects Nitrogen Dioxide has on a person

Answer 17

Coughing/Toxic poisonous gas that irritates the respiratory system

Question 18

Types of gas sensors 
Gas Chromotograph  GC
Electrochemical EC
Infrared IR
Tube

Answer 18

Oxygen GC - EC
Carbon monoxide GC-EC-IR-Tube
Carbon Dioxide GC- EC- IR - Tube
Methane GC- IR
Nitrogen GC
Hydrogen GC- EC
Nitrogen Dioxide GC - Ec- Tube

Question 19

Why is it not advisable to breath over the sensors

Answer 19

Moisture from breathe can poison the O2 sensor

Question 20

Where could methane be found on a surface mine

Name 3 areas

Answer 20

Coal mining/Bore holes/Coal bearing strata

Question 21

Where could Sulphur Dioxide be found on a surface mine

Name 2 areas

Answer 21

Spon Com in coal containing Sulphur

Where Sulphur is in coal

Question 22

When coal heats gases appear at characteristic temperatures

Name 6 gases and the order in which they appear

Answer 22

Carbon Dioxide 
Carbon monoxide 
Methane 
Hydrogen 
Ethane 
Hydrocarbons

Question 23

What is the maximum general body concentration of Carbon Dioxide to which a coal mine worker can be exposed if a continual personal monitoring method is used to calculate the TWA calculation of Carbon Dioxide to which the person is exposed

Answer 23

TWA-1.25%

STEL- 3.00%