During the defrost cycle of a hot-gas defrost system, the hot refrigerant vapor is used to melt the ice on the evaporator surface.

Match each of the following gas furnace-related terms with the statement that best describes it.

Rhona and Jerome share each other’s thoughts and feelings and are prepared to support each other, but they do not feel physical attraction. Their love is called ________.

Which of the following statements regarding furnace efficiency is false?

At equal pressure, less LP gas will flow through an orifice than natural gas.

Typically, exterior walls of a chest freezer are used to dissipate heat to ambient air.

In a domestic unit, a hot-gas defrost system includes a bypass line that connects the ____ line to the evaporator inlet.

A ____ condenser relies entirely on conduction to remove heat from refrigerant inside the condenser tubes.

Gas combustion is used solely in central forced-air or hydronic heating systems.

A combination gas valve has a manual shutoff valve to control gas flow.