Daily Quiz (134)


A team of researchers recently published a study on the use of what in anticorrosive coatings for steel due to their unique chemical composition and wide availability?


True or false: Although the term “sandblasting” is still often used to describe abrasive blasting industry, sand contains free silica and due to its classification as a carcinogenic, is widely banned for blasting purposes.


True or false: In surface preparation operations, hackles are most likely to be formed on steel substrates when the blast abrasive is steel shot.


True or False: The restoration of an historic mill building in Altoona, Pennsylvania, required lead paint removal.


In 2021, the Occupational Safety and Health Administration reached a settlement with companies that had been using blasting materials containing trace amounts of what?


True or False: Ground hazelnut shells can be used for abrasive blasting material as a less toxic option.


Industrial abrasives used today primarily include all except:


True or false: Although the term “sandblasting” is still often used to describe abrasive blasting industry, sand contains free silica and due to its classification as a carcinogenic, is widely banned for blasting purposes.


A White Metal Blast, SSPC-SP 5, allows what to remain on the surface of steel after blast cleaning?


True or false: In May, the Occupational Safety and Health Administration and several companies that produce or use blasting materials containing trace amounts of beryllium were unable to reach a settlement regarding communications about the beryllium rules.


Which is considered highly abrasive?


According to a recent JPCL article, which abrasive is most commonly used as a high-performance blast media for the cleaning of aluminum and fiberglass structures?


What year was the first abrasive blasting process patented?


Ground corn cob, rice hulls, walnut shells and fruit pits are all examples of what type of abrasive?


True or false: According to an archived PaintSquare Press article, when using vacuums to reclaim abrasives, it is a rule to use the largest hose possible from the inlet of the vacuum to the vacuuming site.


True or false: There is a standard for determining if abrasive is contaminated with oil that involves putting abrasive in a clean glass jar with clean water, putting a lid on the jar and shaking it, and then checking for an oil film on the surface of the water or coloration or cloudiness of the water itself.


True or false: SSPC-AB 3 is meant to be used as a standard for both newly manufactured abrasive media and recycled media.


True or false: Regarding the profile on blast-cleaned steel, a shallow peak height with a dense peak density may be beneficial, versus a deep peak height as is often specified.


Which of the following abrasives is not among those claimed by one JPCL author to produce low dust and to contain no heavy metals?


True or false: Abrasive blast workers are regularly exposed to noise in excess of 140 dBA.


True or false: The blasting abrasive olivene is derived from mineral deposits.


True or false: Chief among byproduct abrasives used for blast cleaning are agricultural products.


True or false: Dry ice pellets used as abrasive can produce a profile on steel.


True or false: A recently reported study on abrasive blasting media refutes the conclusions of Roper et al. by asserting that the peak density of surface profile is not as important as peak height in contributing to the performance of corrosion control coatings.


Where would you expect to find an air wash separator?


In coating work, what are fines?


True or false: Abrasive in a centrifugal wheel blast operation is never recycled and reused more than twice.


Which of the following terms is out of place in the list?


True or false: Rogue peaks are most likely to be created on steel substrates when the surface preparation abrasive is steel shot.


Which of the following is not a naturally occurring abrasive?


True or false: 450 mph is a typical particle speed for abrasive in an air abrasive blast system that utilizes a Venturi nozzle.


What do the terms “working mix” and “operating mix” refer to?


True or false: In surface preparation operations, hackles are most likely to be formed on steel substrates when the blast abrasive is steel shot.


True or false: Byproduct abrasives include nickel slag, copper slag, boiler slag and peach pits.


True or false: Bristle blasting requires the use of metallic abrasives.


True or false: A worker with tree nut allergies was apparently killed by inhaling walnut shell particles from an abrasive blasting operation.


In protective coating work, a sieve analysis is used to determine the weight distribution of blasting abrasive.


True or false: The air abrasive blast method that produces the least debris uses dry ice as the abrasive.


True or false: Sodium bicarbonate can be used in both wet blast and dry blast operations.


True or false: Testing blasting abrasive by placing it in a clean glass jar containing clean water and shaking the jar with the lid on is a test for salt contamination.


According to a surface preparation study reported in JPCL, abrasive size was not found to be a primary driver in the resultant surface profile depth and peak density of blasted steel surfaces.


True or false: The more friable an abrasive, the greater the tendency for the abrasive to break down upon impact.


When abrasive is recycled without sufficient new abrasive being added to the operating mix, what happens to the surface profile of steel being cleaned?


True or false: One inspector’s guide says that ground egg shells are used as a blasting abrasive.


True or false: Olivine is classified as an agricultural blasting abrasive.


True or false: SSPC has a test method for determining the size of abrasives.


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


SSPC classifies non-metallic abrasive into three kinds, two of which are mineral and slag and other by-products. What is the third class?


True or false: Waterjetting is another name for power washing.


True or false: Coal slag abrasive is mainly aluminum silicate.


True or false: The SSPC standard for ferrous metal abrasive is intended to be used for both new and recycled abrasive.


True or false: Aluminum oxide and garnet are sometimes recommended as appropriate abrasives for blast cleaning stainless steel.


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


True or false: Another name for aluminum silicate abrasive is coal slag.


True or false: As abrasives for blast cleaning, glass beads are classified as byproduct abrasives.


True or false: SSPC-AB 3 is meant to be used as a standard for both newly manufactured abrasive media and recycled media.


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


True or false: In a sieve analysis of abrasives, the sieve number describes the number of openings in a linear inch of sieve mesh.


True or false: Non-woven abrasive pads are a form of coated abrasive.


True or false: ASTM has a test method for determining if an abrasive is contaminated with oil.


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


True or false: According to the Concrete Polishing Council of the American Society of Concrete Contractors, the grinding stage of the concrete polishing process is carried out with bonded abrasive of 100 grit or lower.


According to the Concrete Polishing Council of the American Society of Concrete Contractors, how many abrasive passes are required to achieve Level 4 finished gloss, "Highly Polished"?


True or false: A wet blasting system requires water pressure to provide a cleaning force.


Where is silica found in the coatings industry?


True or false: Abrasive blast workers are regularly exposed to noise in excess of 120 dBA.


True or false: According to a JPCL article on achieving peak performance from abrasives, the easiest way to adjust profile height in the field is by changing the velocity of the abrasive.


True or false: In an air abrasive blasting operation, if you change from a sand abrasive with a specific gravity of 2 to a garnet abrasive with a specific gravity of 4, you should expect an increase in cleaning rate.


What kind of blasting abrasive is composed of aluminum silicate?


What is the name for an abrasive’s resistance to breakdown on impact?


True or false: Abrasive fines are debris found in blasting abrasive.


True or false: Abrasive used for abrasive blast cleaning to remove rust and mill scale should have a Mohs hardness of 1.


What makes crushed glass a “green” abrasive, according to the JPCL article, “What is a Green Abrasive?”


In a centrifugal wheel blast machine, what is another name for “operating mix?"


True or false: Non-skid coatings with aggressive abrasives such as aluminum oxide can be spray-applied with airless equipment.


True or false: Corn cobs, walnut shells, and olivine are used to make blast abrasives classified as agricultural.


True or false: Zirconium silicate is crushed, dried and screened to produce the blast cleaning abrasive aluminum oxide.


True or false: A highly friable abrasive is good for recycling.


What is the source of blasting abrasives?


What is the common name for aluminum silicate abrasive?


Non-metallic abrasives are derived from what source?


True or false: Angular rather than round abrasives are best for removing soft pliable coatings, according to a JPCL Maintenance Tip.


SSPC classifies non-metallic abrasive into three kinds, two of which are mineral and manufactured. What is the third class?


“Grading,” “sizing,” and “screening” are terms used to describe what process?


How do you determine the particle size distribution of abrasive material used for blast cleaning?


True or false: Dry ice pellets used as abrasive cannot produce a profile on steel.


True or false: Chopped-up quills from goose feathers are used as abrasive to remove coatings from sensitive substrates.


What do the terms “working mix” and “operating mix” refer to?


True or false: Both wet and dry ice have been used as abrasives in abrasive blasting operations.


Which method of blasting produces the least blast debris, presuming the same substrate in the same condition is being cleaned by each method?


True or false: Agricultural blast cleaning abrasives are made from walnut shells, corn cobs, and peach pits, among others.


True or false: Staurolite sand can be considered a “green” abrasive because it is an industrial byproduct.


If an abrasive fractures easily, it is said to be which of the following?


Olivine is what type of blasting abrasive?


What name is usually given to blasting abrasive residue that has been broken down into a powder?


True or false: Though not described in a standard, one check for oil contamination of abrasives involves putting abrasive in a clean glass jar with clean water, putting a lid on the jar and shaking it, and then checking for an oil film on the surface of the water or coloration or cloudiness of the water itself.


True or false: SSPC-AB 1, Mineral and Slag Abrasives, includes manufactured, non-metallics such as silicon carbide.


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.


What is the name for an abrasive’s resistance to breakdown on impact?


What kind of blasting abrasive is comprised of aluminum silicate?


In what kind of work do you hear the term, “operating mix?”


What is the source of potential inhalation hazards that blasters face in air abrasive blasting operations?


True or False: A low-pressure, low-impact abrasive blasting process using a blend of walnut shells and staurolite sand has been developed for cleaning architectural sheet metals and other substrates.


What is another name for “work mix?”


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


What instrument would you use to analyze soluble salt contamination on abrasives?


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 has lowered the permissible exposure limits on crystalline silica.


Which abrasive type is most likely to be used in a portable wheel blast machine for surface preparation of concrete floors?


True or false? The shells from sunflower seeds are recycled as agricultural blast abrasives.


True or false? The contractor is responsible for field testing for oil and soluble salt contamination of new mineral and slag abrasive media before use.


According to JPCL author David Dorrow, what makes an abrasive “green?”


True or False: Sponge blasting employs particles of sponge as abrasive.


Determining the particle size distribution of blast abrasive is achieved by what method?


Which one of the following blasting abrasives is derived from mineral deposits?


A conductivity meter is normally used to check for what contaminants on abrasive for blasting?


Which one of the following agricultural materials is typically not used to create abrasives for blasting?


What kind of abrasive was used to remove the failing baked-on gold enamel from 30,000 square feet of clay tiles on the New York Life building in preparation for applying gold leaf?


Which of the following is an abrasive media used in a blasting system on delicate substrates?


When abrasive is recycled without sufficient new abrasive being added to the operating mix, what happens to the surface profile of steel being cleaned?


True or False: Generally speaking, a high-density abrasive will not clean as fast as a less-dense abrasive.


What is a typical particle speed for abrasive in an air abrasive blast system that utilizes a venturi nozzle?


True or false: In air abrasive blasting operations, the same particle size mix of silica sand and coal slag yield different profile ranges on steel.


True or false: If you are removing a soft, pliable coating from a steel surface, a rounded abrasive will be more productive than an angular one.


What are abrasive fines?


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


A stationary centrifugal wheel blast machine typically uses what type of abrasive?


True or false: Chopped-up quills from goose feathers are used as abrasive to remove coatings from sensitive substrates.


A conductivity meter can be used to check for what contaminant on abrasive?


What is the main reason for a sieve analysis of abrasive?


Which of the following abrasive types is normally the hardest?


What is abrasive friability?


In addition to steel abrasives, which of the following can be considered for reclamation and reuse?


Which of the following materials is not used to create abrasive media for a blast cleaning system?


 
 
   

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