HVAC State Test Prep 08

The two types of refrigeration systems used for air conditioning applications in buildings are:

• vapor compression and water-cooled
• vapor compression and absorption
• absorption and compression
• none of the above

Which compression system can use a wide variety of refrigerants?

• vapor
• absorption
• motorized
• natural

Where are higher-pressure refrigerants effectively used?

• in direct heat chillers
• in water chillers
• in centripetal chillers
• in centrifugal chillers

What type of compressor systems have primarily used HCFC-22 refrigerant?

• high displacement
• negative displacement
• positive displacement
• low displacement

Virtually all _________ compression systems require lubricants to allow efficient operation.

• liquid
• vapor
• solid
• water

In what unit are the viscosity grades measured in refrigeration systems?

• ounce/mm
• ounce3/cm
• pounds/gallon
• centistokes (cS)

Some of the factors you should consider in process chillers are:

• type of refrigerant used
• correct sizing of expansion valve
• low-pressure switch
• low-temperature cutout
• none of the above

Packaged chillers used for HVAC are designed primarily for human comfort and are capable of producing a temperature difference of _________ degrees F.

• 20
• 10
• 30
• 40

Condensers are heat _________ designed to condense the high-pressure, high-temperature refrigerant discharged by the compressor.

• absorbers
• spreaders
• collectors
• exchangers

Compressors are cycled on and off for _________ reduction.

• unit
• heat
• refrigerant
• capacity