Overcharging a system reduces its efficiency by:
A) Increasing the system superheat.
B) Starving the evaporator.
C) Decreasing the system subcooling.
D) Increasing the operating head pressure and compression ratio.
D
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The SAE standard J2788 requires improved performance from ________.
A) The vehicle heating system B) Recovery and recycling machines C) The seat heaters D) The R134a refrigerant
Properly planned and scheduled maintenance is referred to as _______________ maintenance.
Fill in the blank(s) with the appropriate word(s).
Why can oil furnaces operate at higher efficiencies than gas furnaces without condensing water in the heat exchanger or vent?
A) Oil furnace heat exchangers are inherently more efficient B) Unlike gas, no water is mixed with the oil during the combustion process C) Oil furnaces burn hotter D) The flue gas contains only half as much water as flue gas from a gas furnace
Which of these choices correctly lists ions in the order decreasing (strongest to weakest) order of attraction to clay colloids?
a. potassium - calcium - aluminum - sodium b. potassium - aluminum - calcium - sodium c. aluminum - calcium - sodium - potassium d. aluminum - calcium - potassium - sodium