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Daily Quiz (73)


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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