HVAC State Test Prep 11

The sorption of water vapor in a desiccant raises the temperature of the desiccant itself, which in turn

• expands
• cools
• warms
• heats

Common _________ desiccants include water solutions of lithium chloride or glycol.

• solid
• liquid
• paste
• jell

Lower vapor pressure at the surface of a desiccant means it can attract moisture from air, which has a

• higher
• very much higher
• lesser
• lower

In practice, dehumidifiers exhibit process-air dry-bulb temperature increases that typically range from slightly over one to two times that associated with the heat of condensation alone. The entire heat, including the heat of condensation, is termed the heat of _________.

• sorption
• adsorption
• absorption
• exothermic

In a solid desiccant dehumidifier, moist process air is passed through a rotating wheel that resembles a ceramic honeycomb. The desiccant in the wheel absorbs moisture. Then the wheel slowly rotates into a second, heated air stream. The hot reactivation air removes moisture from the desiccant so it can absorb more _________ when the wheel rotates back into the process air stream.

• vapor
• humidity
• water
• heat

Granular desiccants are placed in some form of bed to _________ air.

• humidify
• dehumidify
• clear
• unpollute

In order to be able to manufacture pharmaceuticals, the relative humidity has to be held to as low as

• 1
• 5
• 10
• 20

Desiccants are exceptionally effective at maintaining _________ humidity.

• low
• high
• relative
• excessive

Direct evaporative cooling has the advantages of low first cost and _________ operating costs.

• light
• heavy
• low
• high

Temperature is defined as the _________ state of matter.

• thermal
• solid
• liquid
• frozen