Gloves protect ______ from cuts, scrapes, burns, and chemical or refrigerant spills.
Correct!
Wrong!
Which material is generally used for making air-distribution system?
Correct!
Wrong!
In heating systems, return grilles are ideally installed where the _______ air in the area will be returned.
Correct!
Wrong!
What is the volume damper is used for?
Correct!
Wrong!
What is the minimum rating of AFUE for induced draft furnace?
Correct!
Wrong!
Which type of furnace is generally used in basements?
Correct!
Wrong!
What is the basic function of humidifier?
Correct!
Wrong!
For what purpose, furnace vent system is used for?
Correct!
Wrong!
Vent connectors should be made as short as possible and pitched upward toward the main vent at a slope of no less than________.
Correct!
Wrong!
A chimney must extend at least ______above the highest point where it passes through the roof.
Correct!
Wrong!
________ are those in which the system’s refrigeration components are housed in two or more separate and matched units.
Correct!
Wrong!
When installing the room thermostat and control wiring, always install at least _____ conductor thermostat wire, even if installing the furnace in a heating-only system.
Correct!
Wrong!
Split heat pump systems can provide ________by reversing the flow of refrigerant in the system.
Correct!
Wrong!
The indoor evaporator coil used in a __________.
Correct!
Wrong!
The indoor coil must have the capacity and physical size to function as__________.
Correct!
Wrong!
Never mount the outdoor unit on concrete blocks or wooden skids as they____________.
Correct!
Wrong!