HVAC Quiz

Which of these heating methods is most commonly used as a heat source in cold climates?

• Kerosene heaters

• Coal furnaces

• Natural gas furnaces

• Electric heaters

Which of the following is a device used to maintain indoor air quality?

• Condensate pump

• Evaporator

• Condenser

• Ultraviolet light

The purpose of an evaporator in the refrigeration cycle is to _____.

• make sure no liquid gets into the compressor

• transfer heat from the air to the refrigerant

• transfer heat to the outdoors

• provide a pressure drop

Heat can be transferred from a refrigerant to the outdoors on a hot day because the _____.

• refrigerant is cooler than the outdoor air

• refrigerant is warmer than the outdoor air

• refrigerant and the air are at the same temperature

• condenser is colder than the evaporator

The expansion device in a mechanical refrigeration system _____.

• raises the temperature of the refrigerant

• acts as a heat exchanger

• provides a pressure drop

• raises the pressure of the refrigerant

Oxygen is never used to purge an HVAC system because _____.

• oxygen will contaminate the system

• an explosion could occur under certain conditions

• oxygen contains too much moisture

• oxygen is too expensive to use for that purpose

Which of these devices is used for energy conservation?

• Humidifier

• Electronic air cleaner

• Heat recovery ventilator

• Chiller

• mastic

• duct tape

• electrical tape

• paint

• reclaimed

• recycled

• recovered

• restored

• NEC®

• Southern Building Code

• International Building Code

• regional fire codes