A system that is undercharged will operate with:
A) A high subcooling and a low superheat. B) A low subcooling and a low superheat.
C) A low subcooling and a high superheat. D) A high subcooling and a high superheat.
[Ques. 2] What is an advantage of a crossflow tower?
A) Cross flow cooling towers have variable-pitch air inlet vanes to provide more efficient airflow through the tower.
B) Cross flow cooling towers can employ ECM blower motors.
C) A cross flow tower can be configured for a lower height.
D) The discharge air can be ducted into conditioned space in the winter to provide free heat and humidification.
[Ques. 3] How do you check system performance during the heating cycle?
A) Consult system pressure charts for indoor and outdoor temperatures.
B) Recharge the system using a heating performance check chart.
C) Attach a low-pressure gauge to the vapor line.
D) Recharge the system with the correct amount of refrigerant.
[Ques. 4] How does a kerosene heater prepare its fuel for combustion?
A) Oil is atomized using a high-pressure pump and an atomizing nozzle.
B) Kerosene does not need to be prepared for combustion because it is highly volatile.
C) Oil is vaporized by the heat of combustion and the hot surface of the combustion chamber.
D) Oil is atomized using a centrifugal motor that slings small droplets of oil into the combustion chamber.
[Ques. 5] One advantage of rooftop units on small commercial buildings is that:
A) They are available in larger capacities than central station systems.
B) They operate more efficiently than systems located inside the building.
C) They offer a substantial savings of space within the building.
D) They are easier to service than systems located inside the building.
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