What is the purpose of the gas burner venturi?
A) The venturi ensures that only gas enters inside the burner while air is directed into the combustion area.
B) The venturi ensures that the proper amount of gas flows into the burner.
C) The venturi mixes the gas and primary air by making them swirl as they pass through.
D) The venturi makes the flames swirl inside the combustion chamber to increase contact with the heat exchanger and boost efficiency.
[Ques. 2] How can improperly loading an open display case adversely affect its operation?
A) It can block the condenser airflow.
B) It can disrupt the air curtain.
C) It can interfere with the operation of the case modulation damper.
D) It can add more heat load on one shelf than another.
[Ques. 3] When installing a rooftop package unit, proper airflow through the condenser fan is critical. The minimum free clearance air space above the condenser fan should be:
A) 60 in. B) 12 in. C) 72 in. D) 48 in.
[Ques. 4] One unique problem with rooftop units installed in a seacoast area is that:
A) Salt spray accelerates corrosion of metallic parts.
B) The prevailing winds reduce the cooling capacity of the condenser.
C) Codes in coastal areas typically require a minimum 3 ft ground clearance to allow for flooding.
D) Systems with a high sensible capacity are required because of the low humidity in coastal areas.
[Ques. 5] Which type of burner port should be used for maximum efficiency?
A) In-shot B) Slotted C) Drilled port D) Ribbon
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