UA Local 467 Chapter 1

___ is the elements that make up atmospheric air with moisture and particles removed.

• Standard air
• Dry air
• Free air
• Exhaust air

Absolute pressure is pressure above ___.

• Atmospheric pressure
• Gauge pressure
• A water column
• A perfect vacuum

___ is the scientific study of the properties of air and the relationships between them.

• Psychometrics
• Combustion
• Thermodynamics
• Stratification

A psychrometric chart defines ___.

• The propertis of the air at various conditions
• Indoor air quality ratings
• Enthalpy
• The difference between the Fahrenheit and the Celsius scales

___ is the temperature of the air without reference to the humidity level.

• Enthalpy
• Wet bulb temperature
• Dry bulb temperature
• Specific gravity

Wet bulb temperature is measured using a(n) ___.

• Thermometer
• Electronic meter
• WAG
• Humidity sensor

___ is the force created by a substance per unit of area.

• Pressure
• Kinetic energy
• PSIG
• Potential Energy

___ is the most important variable that is measured and controlled in a commercial HVAC system.

• Humidity
• Specific Heat
• Enthalpy
• Temperature

___ is the total heat contained in a material.

• Humidity
• Specific Heat
• Enthalpy
• Temperature

the amount of moisture in air compared to the amount of moisture it could hold if it were saturated (full of water).

• Relative humidity
• Percent enthalpy
• Specific Heat
• Temperature