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GAS TESTING QUESTIONS AND ANSWERS - 1

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
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