mine gases

what is oxygen?
A) it is a tasteless, odorless, colorless gas which supports life and combustion
B) it is a tasteless, colorless, odorless gas that does not support life
C) an explosive gas that gives off a foul odor
D) it is a colorless, tasteless gas that gives of a foul odor

What percent oxygen can a person most easily work in?
A) 50%
B) 17%
C) 10%
D) 21%

What percent oxygen will a person breathe faster and deeper?
A) 21%
B) 30%
C) 17%
D) 25%

The Earth's atmosphere consists of what percert oxygen?
A) approx 3/4 or 75%
B) approx 1/5 or 20%
C) approx 1/4 or 25%
D) approx 1/2 or 50%

What is notrogen?
A) it is a tasteless, odorless, and colorless gas which will neither support life nor combustion
B) it is an explosive gas that gives off a foul odor
C) it is a colorless, tasteless, odorless gas that supports combustion

The Earth's Atmosphere consists of what percent nitrogen?
A) approx 1/5 or 20%
B) approx 1/2 or 50%
C) approx 4/5 or 80%
D) approx 1/4 or 25%

What is carbon dioxide (CO2)?
A) it is colorless gas with a foul odor which is combustible
B) carbon dioxide is a colorless, odorless, combustible gas
C) carbon dioxide is a colorless and odorless gas formed by the chemical combination of carbon and oxygen
D) it is a gas formed by the chemical combination of sulfur and oxygen

What is the specific gravity of carbon dioxide?
A) 1.529
B) 0.967
C) 0.555
D) 1.000

WHere might concentrated accumulations of carbon dioxide ordinarily be found?
A) Along belt lines
B) Near the roof
C) Near the floor, in inadequately ventilated places
D) In well ventilated places

How is carbon dioxide detected?
A) usually by chemical analysis
B) by the protannic acid method
C) by the galvanometer
D) by the iodine peroxide

What percent of carbon dioxide is given off by the body during exhalation?
A) approx 1.6 to 2.0 percent
B) approx 2.6 to 6.6 percent
C) approx 16 to 20 percent
D) approx 26 to 66 percent

What is methane (CH4)?
A) a colorless, odorless and tasteless combustible gas
B) a colorless, odorless and tasteless poisonous gas
C) it is the chemical combination of oxygen and hydrogen
D) a colorless, odorless and tasteless gas which supports combustion

What is the specific gravity of methane?
A) 1.967
B) .555
C) 1.000
D) 1.529 5

where is methane usually found in mines?
A) in all panel workings and along the floor
B) along all longwall faces
C) along the roof, to the rises, in the vicinity of working faces, in dead ends and above falls
D) in all dip workings

What is firedamp?
A) an explosive misture of methane and air
B) an explosive mixture of carbon dioxide and air
C) an explosive mixture of carbon monoxide and air
D) an explosive mix of hydrogen and air

what is the range of explosibility for methane?
A) between 1.5% and .5%
B) between 5% and 15%
C) between 2% and 12.5%
D) between 15% and 20%

what is the percentage of methane required for maxium explosive violence?
A) 10%
B) 20%
C) 15%
D) 5%

What is the percentage of oxygen below which no explosion of methane air mixture can occur?>
A) 5%
B) 12%
C) 16.5%
D) 20%

What effect does atmosphere with reduced oxygen content have upon the explosibility of methane?
A) Methane's explosive limit does not change
B) A small amount of methane is necessary to cause an explosion
C) Methane's ignition temperature increases
D) A greater percentage of methane is necessary to start an explosion in an atmosphere which contains less than the normal percentage of oxygen

What effect does coal dust in the air have upon the explosibility of methane?
A) the upper explosive limit is decreased
B) the lower explosive limit is increased
C) the lower explosive limit is decreased
D) the upper explosive limit is increased

what dangerous gas is most likely to be encountered above a pillar fall?
A) Hydrogen sulfide
B) carbon dioxide
C) carbon monoxide
D) methane

if a split of air above 20,000 cubic feet per minute contains 3% methane how many cubic feet per minute would be required to reduce the methane content?
A) 60,000 cubic feet
B) 80,000 cubic feet
C) 6,666 cubic feet
D) 600,000 cubic feet

what is the least percentage of methane that can be detected with a flame safety lamp?
A) .75%
B) .3%
C) 1%
D) .5%

what is meant by the diffusion of gases?
A) their capacity to absorb water
B) their tendency to escape confinement
C) their mixing with each other when they contact
D) their tendency to volatilize

where is methane normally found?
A) since methane's specific gravity is 0.555, it is normally found in low places
B) since methane's specific gravity is 0.555 which indicates that it is lighter than air, it is normally found in high places
C) methane is normally found in abandoned or worked out areas of the mine
D) methane is normally found at the working areas of the mine

what is carbon monoxide?
A) it is a colorless, odorless, tasteless gas supporing combustion
B) it is a colorless, combustible gas with a disagreeable odor
C) it is a colorless, odorless, tasteless, combustible, and poisonous gas
D) it is a colorless, odorless, tasteless, inert gas

what is the source of carbon monoxide?
A) it is produced as a result of the use of explosives
B) it is the result of inadequate ventilation
C) it is the product of incomplete combustion (combustion with an insufficiency of oxygen)
D) it is produced when batteries are charged

what is afterdamp?
A) the atmosphere following an explosion containing carbon dioxide, carbon monoxide, decreased oxygen, nitrogen, hydrogen, and smoke
B) the atmosphere containing carbon monoxide and oxygen
C) the atmosphere containing sulfur dioxide
D) the atmosphere deficient in oxygen

what is the principal poisonous gas produced by explosives?
A) ammonia nitrate
B) nitrogen peroxide
C) carbon dioxide
D) carbon monoxide

how much greater affinity does hemoglobin have for carbon monoxide than for oxygen?
A) about 300 times
B) about 200 times
C) about 500 times
D) about 1,000 times

what is the specific gravity of carbon monoxide?
A) 1.000
B) 1.529
C) 0,967
D) 0.555

what is hydrogen (H₂)?
A) it is a colorless, explosive gas with a foul odor
B) it is a colorless, odorless, tasteless, nonexplosive gas
C) it is a colorless, odorless, tasteless, poisonous gas
D) it is a colorless, and tasteless gas

what is the specific gravity of hydrogen?
A) it is the heaviest of all gagses. Specifif gravity 1.529
B) it is the lightest of all gases. specific gravity 0.07
C) the specific gravity in 0.967
D) the specific gravity is 0.555

what is the explosive range of hydrogen?
A) from 4.1% to 7.4%
B) from 4.1% to 74%
C) from 41% to 74%
D) from 7.4% to 41%

what is the ignition temperature of hydrogen?
A) 1,200 degree fahrenheit
B) 655 degree fahrenheit
C) 935 degrees fahrenheit
D) 1,190 degrees fahrenheit

how is hydrogen detected?
A) by chemical analysis
B) by the Bacharach lectronic Canary
C) by the Riken gas detector
D) by the use of litmus paper

what mine gas can be detected by it odor?
A) carbon dioxide
B) carbon monoxide
C) methane
D) hydrogen sulfide

what is the specific gravity of hydrogen sulfide?
A) 0.555
B) 0.967
C) 1.191
D) 1.529

what is the range of explosibility of hydrogen sulfide?
A) 4.3% to 46%
B) 43% to 46%
C) 4.6% to 43
D) 4.3% to 4.6%

what is the most violent explosive point of hydrogen sulfide?
A) 10%
B) 14%
C) 46%
D) 15%

what is the temperature of ignition of hydrogen sulfide?
A) 960 degrees fahrenheit
B) 655 degrees fahrenheit
C) 1,200 degrees fahrenheit
D) 1,300 degrees fahrenheit

what percentage of hydrogen sulfide will become dangerous after a 1/2 hour?
A) .10
B) .005 to .07
C) .5 to .8
D) .25 to .30

what is the specific gravity of sulfur dioxide?
A) 0.555
B) 0.967
C) 2.263
D) 1/529

what is the particular danger of sulfur dioxide?
A) it is extremely combustibile
B) it causes oxygen deficiency
C) it is extemely poisonous even in small amounts
D) it may cause coal dust explosions

what is the first effect on a person exposed to sulfur dioxide?
A) it is extremely irritating and suffocating and is tolerable to breathe
B) the eyes water
C) it has the odor of rotten eggs
D) lung ventilation is increased

what is nitrogen peroxide?
A) it is non-poisonous, incombustibile gas
B) it is extremely poisonous gas frequently formed by the burning of high explosives
C0 it is a combustibile non-poisonous gas, yellow in color
D) it is a poisonous gas with a foul odor

what is the specific gravity of nitrogen peroxide?
A) 1.529
B) 1.589
C) .967
D) 1.191

what percentage of nitrogen peroxide will be fatal?
A) extremely low concentrations, probably about one hundredth of one percent 0.01%
B) an extremely low concentration of one thousandths of one percent 0.001%
C) a concentration of one percent 1%
D) a concentration of one tenth of one percent 0.1%

how may traces if nitrogen peroxide be detected?
A) by a flame safety lamp
B) a paper soaked in a solution of acetate of lead
C) a paper soaked in a solution of starch and potassium iodine will turn blue when exposed to nitrogen peroxide
D) by a chemical analysis

what is the particular danger of nitrogen peroxide?
A) there is no danger
B) it is extremely explosive
C) poisonous but only in large quanities
D) relatively small quanities may cause death even after apparent recovery