Coal

Question	Answer	Notes
While it can take years to develop, early symptoms of this disease include cough, shortness of breath, and chest tightness.	Pneumoconiosis or Black Lung
What control method mitigates the potential for coal dust explosions in underground coal mines?	Rock dusting	Coal dust explosions in underground coal mines are prevented by generous application of rock dust (usually limestone). If an explosion should occur, the rock dust disperses, mixes with the coal dust and prevents flame propagation by acting as a thermal inhibitor or heat sink.
Tests for this gas in structures, enclosures, or other facilities in which coal is handled or stored must be conducted at least once during each operating shift and immediately prior to any repair work in which welding or an open flame is used or a spark may be produced.	Methane
This type of particle in the air of, or in, or on the surfaces of structures, enclosures, or other facilities that must not be allowed to exist or accumulate in dangerous quantities.	Coal dust
Name a standard method for controlling coal dust.	Ventilation; wetting; rock dusting
True or false: There has been an increase in CWP since the late 1990s.	True	Removal from exposure can stop the progression of CWP.
In underground coal mines, a cache of 1 hour SCSR units must be available within how many feet of the working face?	1,000
In coal mining, what is the most important and life-saving characteristic of a properly constructed barricade?	Being air tight
Which two of the following are requirements for the placement of mine refuge stations in underground coal mines? A. Refuges must be provided within 1000 feet of the working face; B. Refuges must be provided within one hour walking time from the working section; C. Refuges or a safe exit to the surface must be provided within one hour travel time for any outby personnel; D. A refuge must be provided to coincide with every SCSR cache	A. Refuges must be provided within 1000 feet of the working face; B. Refuges must be provided within one hour walking time from the working section
What percent of rock dust is required if methane is present in a coal mine? A. 10%; B. 8%; C. 80%; D. > 50%	C. 80%
True or false: Removal from exposure to coal dust can stop the progression of CWP	True
What is the exposure limit for coal dust? A. 1.5 mg/m3; B. 2.0 mg/m3; C. Depends on the level of quartz; D. There is no coal dust exposure limit	C. Depends on the level of quartz
Which was an outcome of MSHA’s coal dust standard? A. Increased the value of coal; B. Reduced coal mine dust exposure limits; C. Required elimination of coal dust exposures; D. Adopted OSHA’s coal dust standard	B. Reduced coal mine dust exposure limits
You can control for underground explosions by rock dusting. What is rock dusting? A. Spraying water onto rocks to saturate dust; B. Spraying coal dust onto the surfaces in the mine; C. Spraying rock dust onto the surfaces in a mine	C. Spraying rock dust onto the surfaces in a mine
Which of the following is not a disease caused by coal dust? A. CWP; B. NIHL; C. Silicosis; D. COPD	B. NIHL
True or false: Rock dust is made of silica, which makes it good for absorbing generated heat and stopping chain reactions.	False
Why is float coal dust accumulation in a mine a concern? A. It can be explosive; B. You can carry the coal dust out of the mine into the community; C. It can float out of the mine and contaminate the environment; D. It can contaminate workers’ clothing	A. It can be explosive
True or false: Miners in underground coal mines are required to carry a self-rescue device.	True