Why are face shields worn during arc welding?
A) Face shields are not necessary when arc welding.
B) To magnify the work area and make it easier to see
C) To protect technicians from strong ultraviolet (UV) light
D) To keep the technician from breathing in harmful fumes
[Ques. 2] Why are biocides added to cooling-tower water?
A) To reduce biofilm B) To increase biofilm
C) To decrease the pH D) To increase the pH
[Ques. 3] In the refrigerant safety rating B1, what does the 1 signify?
A) Low flammability B) High flammability C) Nonflammable D) High pressure
[Ques. 4] How can technicians protect themselves from hot sparks produced by most welding processes?
A) Wear light weight clothing made from synthetic material.
B) Use welding rods that prevent the formation of sparks.
C) Wear heavy protective clothing, gloves, and eye protection.
D) Use a spark arrestor to prevent any sparks from occurring during the welding process.
[Ques. 5] How can scaling be reduced in water towers?
A) There is a small amount of water added constantly to the cooling tower.
B) There is a small amount of water drained off the cooling tower sump.
C) There is a small amount of water added once a day to the cooling tower.
D) There is a small amount of water saved from the cooling tower sump.
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