If a restriction clears up when the system is turned off and allowed to warm, the restriction was probably due to:
A) Acid. B) Noncondensables. C) Carbon. D) Moisture.
[Ques. 2] What happens when the electrical contacts close in the motorized valve?
A) The bypass pump stops. B) The circulator pump starts.
C) The bypass pump starts. D) The circulator pump stops.
[Ques. 3] Which of the following is the purpose of vibration isolation pads?
A) They absorb shock. B) They maintain airflow around the unit.
C) They keep the unit in place. D) They reduce sound.
[Ques. 4] Why do communicating zone systems NOT use bypass dampers?
A) They can operate in free cooling mode without a bypass damper.
B) They do not have a zone ventilation mode.
C) They control airflow and system capacity based on the number of calling zones.
D) They do not use any high- or low-temperature limits.
[Ques. 5] There are many methods of insulating metal ductwork. Which of the following methods is NOT used to insulate ducts?
A) Bubble outer wrap or liner B) Spray-on urethane foam
C) Fiberglass outerwrap with vapor barrier D) Fiberglass liner
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