Intro to HVAC Systems Exam Questions
And Answers 100% Pass
Goal of HVAC - answer✔Create and maintain a comfortable environment within a building
Comfort Requirements - answer✔1. Temperature
2. Humidity
3. Air Movement
4. Fresh Air
5. Clean Air
6. Noise Levels
7. Lighting
8. Furniture and Work Surfaces
HVAC Specific Comfort Requirements - answer✔1. Dry-bulb temperature
2. Humidity
3. Air Movement
4. Fresh Air
5. Cleanliness of the Air
6. Noise Levels
Five System Loops - answer✔1. Airside
2. Chilled Water
3. Refrigeration
Airside Loop: Conditioned Space - answer✔- Maintain dry bulb temperature by adding or
removing "sensible heat" at same rate as it leaves or enters the space
- Maintain humidity by adding or removing moisture (latent heat) at same rate as it enters or
leaves space
Conditioned Air - answer✔also know as supply air and the air that carries the heat and moisture
out of the space is called return air
Cooling Loads - answer✔Typical sources of heat and moisture
Supply Fan - answer✔Delivers supply air (SA) to the space. Sometimes the same fan is used to
draw return air out of the space
Return Fan - answer✔If supply fan is not also drawing return air out of the space then a return
fan completes this task
Filter - answer✔Part of HVAC system that removes many airborne contaminents in the air
Cooling Coil - answer✔heat exchanger that is often used to cool and dehumidify the supply air
before it is delivered to the space
Constant-volume System - answer✔Provides constant quantity of supply air and varies the
supply-air temperature in response to the changing cooling load in the space
Variable-air-volume System (VAV) - answer✔Varies the quantity of contstant-temperature
supply air in response to changing cooling load in the space
Zone - answer✔Group of similar conditioned spaces
Supply-Air Distribution System - answer✔- typically constructed of sheet-metal ducts, fittings
and diffusers
- used to directly supply air from central air handler to one or more conditioned spaces
Diffusers - answer✔used to distribute the supply air effectively to the conditioned space
Chilled-water loop - answer✔contained in systems that use water flowing through the cooling
coil
Pump - answer✔component that moves around the loop
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