How long can power be retained in the high voltage system once it has been disabled?
A) 10 minutes B) 9944 hours C) 90 seconds D) None of these
A
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Air at 32°C and 75% humidity is to be conditioned to 24°C and 50% humidity. The heat transfer required to reduce the moisture content to the desired amount is nearest:
A) 42 kJ/kg B) 47 kJ/kg C) 53 kJ/kg D) 58 kJ/kg
A 1Ø compressor (CSIR) has proper voltage, starts and runs for about 5 seconds, then goes out on overload. What is the most likely problem?
a. The start capacitor is bad. b. The compressor is locked up. c. The start relay contacts are stuck open. d. The start relay contacts are welded closed.
What is the program development cycle?
What will be an ideal response?
How does the reversing valve switch a heat pump between heating and cooling modes?
a. It reverses refrigerant flow through the compressor. b. It causes both check valves to allow refrigerant flow to the indoor coil. c. It causes both metering devices to meter refrigerant. d. It reverses refrigerant flow through the indoor and outdoor coils.