1) Where is Methane most likely to be found in a mine?
Answer:
Near the roof, as it is lighter than air.
2) What percent of carbon monoxide can cause death in less than one hour?
Answer:
0.4 percent or more.
3) How do oxides of nitrogen cause death?
Answer:
Causes fluid to accumulate in lungs resulting in asphyxia.
4) What are the sources of Hydrogen in a mine?
Answer:
Charging batteries, mine fires, and explosions.
5) Hydrogen is always present after what type of explosion?
Answer:
Coal dust explosions.
6) Write down the chemical symbols of methane and hydrogen sulfide.
Answer:
CH4 and H2S.
7) What percentage of the earth's atmosphere is oxygen?
Answer:
20.94 percent oxygen.
8) What percent of the earth's atmosphere is nitrogen? 78.09 percent nitrogen.
Answer:
78.09 percent nitrogen.
9) Once two or more gases mix uniformly will they separate or come apart?
Answer:
No.
10) When is the oxygen (O2) level in air considered to be dangerous?
Answer:
When oxygen (O2) level falls below 16%.
11) What is the chemical symbol of carbon dioxide?
Answer:
CO2
12) What element in the air is essential for life?
Answer:
Oxygen
13) How does the body receive oxygen?
Answer:
By breathing, oxygen is absorbed by the blood and carried to the cells of the body.
14) What is meant by the term "black damp"?
Answer:
An atmosphere deficient in oxygen.
15) How can methane gas be detected in a coal mine?
Answer:
Chemical analysis, flame safety lamp and methane detectors.
16) What is the explosive range of methane?
Answer:
Five to fifteen percent.
17) A flame safety lamp will go out when the oxygen percentage is below what?
Answer:
16 percent
18) The explosive range of carbon monoxide is what?
Answer:
12.5-74 percent.
19) What distinctive odor does hydrogen sulfide gas smell like?
Answer:
Smells like rotten eggs.
20) What are the properties of hydrogen sulfide?
Answer:
Poisonous and colorless with an odor like rotten eggs.
21) What is a flammable mixture of methane and air which can either burn or explode when ignited called?
Answer:
Firedamp
22) A sealed area of a coal mine after a period of time will be found to have the absence of what?
Answer:
Oxygen
23) What is the specific gravity of carbon dioxide?
Answer:
1.529
24) How are oxides of Nitrogen formed?
Answer:
From the use of explosives in mines
25) How are results from analysis of oxides of Nitrogen reported?
Answer:
In terms of nitrogen dioxide.
26) What is the ignition temperature of methane?
Answer:
1100-1380° F
27) What is the ignition temperature of Carbon monoxide?
Answer:
1100° F.
28) Is hydrogen explosive?
Answer:
Yes
29) What is the specific gravity of hydrogen?
Answer:
It is the lightest of all gases with a specific gravity of 0.0695.
30) What is the explosive range of hydrogen?
Answer:
4.1 to 74 percent.
31) How is hydrogen detected?
Answer:
By chemical analysis.
32) What is the principal poisonous gas produced by explosions?
Answer:
Carbon monoxide.
33) What effect does carbon monoxide have on life?
Answer:
It is extremely poisonous.
34) How does carbon monoxide cause injury to life?
Answer:
By combining with the hemoglobin of the blood and excluding oxygen.
35) What percentage of carbon monoxide will produce slight symptoms in several hours?
Answer:
200 PPM (.02%).
36) What percentage of carbon monoxide will produce discomfort in two or three hours?
Answer:
400 PPM (.04%).
37) What percentage of carbon monoxide will produce a tendency to stagger in one and one-half (l.5) hours?
Answer:
1200 PPM (0.12%).
38) What percentage of carbon monoxide will produce symptoms of unconsciousness in thirty (30) minutes?
Answer:
2000-2500 PPM (.20%-.25%).
39) How much greater affinity does hemoglobin have for carbon monoxide than for oxygen?
Answer:
About three hundred (300) times.
40) Why are small quantities of carbon monoxide injurious?
Answer:
Because it is not easily eliminated and it accumulates in the blood.
41) What is the specific gravity of carbon monoxide?
Answer:
0.967
42) What is carbon monoxide (CO)?
Answer:
It is a colorless, odorless, tasteless, combustible, and poisonous gas.
43) How can carbon monoxide be detected?
Answer:
By carbon monoxide detectors, and by analysis.
44) Workers should not be employed for a period of 8 hours where the carbon monoxide content exceeds what?
Answer:
50 PPM (0.005%)
45) What percentage of carbon monoxide might produce symptoms of poisoning if breathed indefinitely?
Answer:
0.01%.
46) What is the source of carbon monoxide?
Answer:
It is the product of incomplete combustion (combustion with an insufficiency of oxygen).
47) When is carbon monoxide most likely to be found in mines?
Answer:
When there is a mine fire or after an explosion.
48) What instruments are most often used in detecting methane?
Answer:
The flame safety lamp and methane detectors.
49) What is the least percentage of methane that can be detected with a flame safety lamp?
Answer:
About one percent (1%).
50) What gas is odorless, tasteless, non-toxic, colorless and explosive in the concentration of 5%-15%?
Answer:
Methane