The following phase changes are either exothermic or endothermic. Which choice represents the correct combination?
a. ice to liquid - exothermic c. gas to liquid - exothermic
b. liquid to gas - exothermic d. solid to liquid - exothermic
C
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What are the main components of the AC generator?
What will be an ideal response?
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The dead center is correctly adjusted by turning the tailstock handwheel until a resistance is felt and then:
A) Backing off so there is some end play B) Turning in one-fourth turn C) Stopping D) Backing off until the dog bent tail clicks freely in the slot
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Why are parallel circuits used as to supply power for loads in HVACR equipment?
What will be an ideal response?
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Using steel piping in a refrigeration system that uses ammonia will prevent _____
a. fire b. explosion c. corrosion d. contamination
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