?In 1977, tris-BP (tris(2, 3, dibromopropyl) phosphate), which was used as a flame retardant in sleepwear for children, was found to cause mutations and was listed as a probable _____.
A. ?human reproductive toxicant
B. ?neurotoxicant
C. ?carcinogen
D. ?renal toxicant
Answer: C
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:When connecting gauges to an already installed and operating unit with split system installation valves, the installation valves should be
A) Left alone. B) Frontseated to allow the gauges to read the system pressures. C) Backseated as tightly as possible to prevent refrigerant from escaping. D) Moved to the mid position to allow the gauges to read the system pressures.
Which of the following types of charge is usually employed when a partial charge is required?
A) Positive B) Liquid C) Negative D) Vapor
Which of the following best describes the functions of a tractor protection valve (TP)?
A. pressure protects the tractor air supply in the event of loss of pressure in a trailer B. routes trailer supply air and service application signal to the trailer pneumatic circuits C. blocks service signal air to the trailer until trailer air supply is activated D. all of the above
A cotter key is a type of snapring.
Answer the following statement true (T) or false (F)