The ATPV of a material represents how long it can withstand thermal energy before there is a 50 percent probability that it will _____.
a. break into flame
b. be reduced to ash
c. create a hole in the material
d. cause a second-degree burn
d. cause a second-degree burn
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NFPA 72® contains requirements for _____.
a. all electrical work performed in a building b. residential and commercial installation of fire alarm systems and equipment c. life safety d. the testing, operation, installation, and periodic preventive maintenance of fire alarm systems
____________________ are a dry fertilizer with large, evenly-sized grains; spread evenly and easily
with much less dust (fines still cause problems); and they are coated to reduce moisture absorption.
Fill in the blank(s) with the appropriate word(s).A thermostatic expansion valve system operating with a refrigerant undercharge will have:
A) A high system subcooling. B) A low system subcooling. C) Higher-than-normal compressor amp draw. D) A low superheat.
The proper preheating temperature for cast iron is:
A) 250-400°F B) Above 1,333°F C) 900-1,200°F D) 500-800°F