39 Questions
Deadly concentrations of toxic gases may be as high as 1000 parts per million (ppm).
False
In a mine, normal operating conditions always ensure that gases are safe for inhalation.
False
The first priority for miners during a mine fire is to extinguish the fire as quickly as possible.
False
Toxic gases are only emitted during emergencies such as fires, not during normal mine operation.
False
For many people, 1 ppm is easy to visualize and is equivalent to the national debt.
False
Acetylene cylinders can be safely stored and transported at a pressure of 100 kPa (15 psi).
False
Ammonia has an explosive range of 1%–50%.
False
Carbon Dioxide is a flammable gas.
False
High temperatures with low humidity are dangerous due to the blistering effect of heat.
False
Acetylene forms an explosive compound with copper and alloys containing more than 67% copper.
True
Ammonia's corrosive qualities may cause distress but will not result in rapid death due to suffocation or oedema in the lungs.
False
One ppm is equivalent to 1 gram per 1,000 kilograms?
False
The STEL is a separate independent exposure limit?
False
The Median Lethal Concentration (LC 50) refers to the dose of a toxic substance that would be fatal for 50% of a test population?
False
The Lower Explosive Limit (LEL) refers to the maximum concentration of a gas that will ignite when exposed to an ignition source?
False
Pure water has a pH of 7, indicating it is acidic?
False
Air is a mixture of several gases that can only be compressed to a liquid but not frozen to a solid?
False
Hydrogen cyanide can be absorbed only through inhalation, and not through the skin.
False
Hydrogen sulphide has a distinctive rotten-egg smell in both low and high concentrations.
False
MAPP gas is extremely unstable and unsafe to use.
False
Methane is heavier than air and has an explosive range of 5%–15%.
False
Nitrogen itself has physiological effects on humans.
False
Nitrogen dioxide causes immediate throat irritation at 200–700 PPM (Parts Per Million).
True
Carbon dioxide is lighter than air.
False
Carbon monoxide has an explosive range of 12.5%–74%.
True
Chlorine is highly soluble in water and easily removed from the air by water sprays.
False
Hydrogen may cause an oxygen-deficient atmosphere resulting in asphyxiation.
True
Hydrogen cyanide can be detected by its distinctive odor of bitter almonds.
True
Carbon monoxide reduces the capacity of the haemoglobin for carrying oxygen to the tissues.
True
Propane is a colorless, odorless, and tasteless gas.
False
Propane has an explosive range of 2.4%–9.5%.
True
Sulphur Dioxide has a strong sweet smell.
False
Sulphur Dioxide is soluble in water.
True
Exposure to high concentrations of Sulphur Dioxide can cause mild irritation to eyes, nose, and throat.
False
Carbon monoxide is always present at the time of a fire and gives little or no warning of its presence.
True
Methane is produced by mine fires or explosions.
False
Sulphur Dioxide gives advance warning in low concentrations when present during a fire in a sulphide ore body.
True
Polyvinylchloride (PVC)-covered belting gives off sulfur dioxide when heated.
False
Radon is a naturally occurring element released into the mine’s atmosphere.
True
Test your knowledge about the formation and presence of carbon dioxide in mine air, as well as its sources and characteristics. Learn about its behavior and potential dangers in underground environments.
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