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HVAC--Module 4 Practice Questions
and Answers 100% Pass
combustion - ✔✔the process by which a fuel is ignited in the presence of oxygen
condensing furnace - ✔✔a furnace that contains a secondary heat exchanger that extracts latent heat by
condensing exhaust gases
heat exchanger - ✔✔A device that is used to transfer heat from a warm surface to a cooler surface
hot surface igniter - ✔✔a ceramic devise that glows when an electrical current flows through it. used to
ignite the fuel/air mix
induced draft furnace - ✔✔a furnace in which a motor-driven fan draws air from the surrounding area or
from outdoors to support combustion
natural draft furnace - ✔✔a furnace where the flow of air from around the furnace provides the air to
support combustion and venting
standing pilot - ✔✔found in older furnaces--it produces a small gas flame that remains on all the time.
thermocouple - ✔✔converts the heat from the pilot flame into a small electrical voltage
flame rectification - ✔✔a method of providing the existence of a pilot flame by applying an AC current to
a flame rod
manometer - ✔✔an instrument that measures air or gas pressure by the displacement of a column of
liquid
Created by Katelyn Whitman © 2025, All Rights Reserved.
HVAC--Module 4 Practice Questions
and Answers 100% Pass
combustion - ✔✔the process by which a fuel is ignited in the presence of oxygen
condensing furnace - ✔✔a furnace that contains a secondary heat exchanger that extracts latent heat by
condensing exhaust gases
heat exchanger - ✔✔A device that is used to transfer heat from a warm surface to a cooler surface
hot surface igniter - ✔✔a ceramic devise that glows when an electrical current flows through it. used to
ignite the fuel/air mix
induced draft furnace - ✔✔a furnace in which a motor-driven fan draws air from the surrounding area or
from outdoors to support combustion
natural draft furnace - ✔✔a furnace where the flow of air from around the furnace provides the air to
support combustion and venting
standing pilot - ✔✔found in older furnaces--it produces a small gas flame that remains on all the time.
thermocouple - ✔✔converts the heat from the pilot flame into a small electrical voltage
flame rectification - ✔✔a method of providing the existence of a pilot flame by applying an AC current to
a flame rod
manometer - ✔✔an instrument that measures air or gas pressure by the displacement of a column of
liquid
Created by Katelyn Whitman © 2025, All Rights Reserved.
