The reversing valve on most air-source residential heat pumps is energized:
A) During the cooling and the defrost cycles. B) During the heating cycle.
C) During the cooling cycle. D) During the defrost cycle.
[Ques. 2] The air filter should be checked:
A) While collecting operational data.
B) During the preliminary inspection.
C) When testing to isolate the cause of the system malfunction.
D) After completion of the service call.
[Ques. 3] Each pound of water evaporated by the cooling tower removes how much latent heat?
A) 1,000 BTU B) 900 BTU C) 970 BTU D) 950 BTU
[Ques. 4] Why would the timer on a time-temperature defrost system reset?
A) The defrost temperature is not cold enough.
B) The timing circuit starts a new countdown.
C) The system did not trigger the switch on the board.
D) The defrost temperature is not warm enough.
[Ques. 5] Which type of electrical space heater has the greatest potential for overheating?
A) Cabinet-type electric space heaters B) Convection baseboard electric space heaters
C) Suspended-force fan-unit electric space heaters D) Forced-air electric space heaters
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