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HVAC General Knowledge Quiz

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Questions and Answers

What is the main function of air-conditioning?

Cooling and de-humidifying of air (correct)

Circulation of air

Cleaning and filtration of air

Heating and humidifying of air

Which refrigerant is commonly used for cooling in mechanical refrigeration?

Freon 22 (Chlorodifluoromethane)

Freon 502 (Tetrafluoroethane)

Freon 12 (Dichlorodifluoromethane) (correct)

Freon 134a (1,1,1,2-Tetrafluoroethane)

What are the properties of Freon?

High heat of vaporization, non-toxic, non-corrosive (correct)

Low heat of vaporization, non-toxic, non-explosive

Low heat of vaporization, non-toxic, non-corrosive

High heat of vaporization, toxic, explosive

What are the recommended average temperatures for summer cooling and winter cooling?

<p>$68^ ext{o}F$ to $74^ ext{o}F$ for summer cooling; $70^ ext{o}F$ to $75^ ext{o}F$ for winter cooling</p> Signup and view all the answers

What is the recommended average air velocity for air motion in a confined space?

<p>$4.57$ to $7.6$ meters per minute measured 36" above the floor</p> Signup and view all the answers

Study Notes

Air-Conditioning Fundamentals

The main function of air-conditioning is to control the temperature, humidity, and air quality in a confined space.

Refrigerants

R-22, also known as Freon, is a commonly used refrigerant for cooling in mechanical refrigeration.

Properties of Freon (R-22)

Freon is a colorless, odorless, and non-toxic gas.
It has a boiling point of -40.8°C and a freezing point of -157.4°C.
Freon is non-corrosive and non-flammable.

Temperature and Air Velocity Recommendations

The recommended average temperature for summer cooling is around 22-25°C (72-77°F).
The recommended average temperature for winter cooling is around 18-20°C (64-68°F).
The recommended average air velocity for air motion in a confined space is around 0.075-0.15 meters per second (0.25-0.5 feet per second).

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Description

Test your knowledge of heating, ventilation, and air-conditioning (HVAC) systems with this quiz. Explore concepts such as general air-conditioning, freon refrigerants, and mechanical refrigeration.