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Daily Quiz (21)


True or false: According to a published study, elevated exposure to crystalline silica does not result when it is present in coating materials being removed by blast cleaning.


True or false: OSHA has extended the date of enforcement of its respirable silica exposure rule by six months.


True or false: A study published in The Lancet estimated that 4,600 deaths worldwide were caused by silicosis in 2013.


According to the EPA, what is the diameter of particles that are respirable?


True or false: The new OSHA action level for exposure to crystalline silica has been reduced from 100 micrograms per cubic meter to 25 micrograms per cubic meter, time-weighted average in an 8-hour period.


Where is silica found in the coatings industry?


True or false: OSHA estimates that its new “Respirable Crystalline Silica in Construction” standard will save over 600 lives and prevent 900 new cases of silicosis each year.


True or false: OSHA’s new Construction Industry Standard on exposure to crystalline silica establishes a PEL of 100 micrograms of silica per-cubic-meter of air at an eight-hour time weighted average (TWA).


What is the new permissible exposure limit for crystalline silica, in micrograms per cubic meter of air, averaged over an 8-hour shift?


True or false: OSHA is expected to ban the use of silica sand as a blasting abrasive in 2016.


According to a study published in The Lancet, how many deaths worldwide were caused by silicosis in 2013?


True or false: According to a published study, elevated exposure to crystalline silica can result when it is present in coating materials being removed by blast cleaning.


True or false: OSHA now forbids the use of silica sand as a blasting abrasive.


True or False: Silica sand and coal slag abrasive with the same particle size distribution will produce different profile depth ranges on blast-cleaned steel.


True or False: In August this year, OSHA issued a proposed rule banning use of crystalline silica as a blasting abrasive.


Why is crystalline silica sand more likely to cause silicosis when it is used for abrasive blasting, as opposed to when it blows around on a beach?


True or false: OSHA’s 2008 National Emphasis Program on Crystalline Silica explicitly identified abrasive blast cleaning as a high-exposure activity.


True or False: OSHA has lowered the permissible exposure limits on crystalline silica.


True or false: Some state highway departments have banned the use of silica sand for abrasive blasting.


Why is crystalline silica sand more likely to cause silicosis when used as an air abrasive blasting material than it is in its natural state, for instance, as beach or river sand?


True or false: Use of crystalline silica sand has now been banned from use as a blasting abrasive in the United States.


 
 
   

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