Unit 26 Quiz

When the compressors are located in the equipment room, the piping is routed

• in floor chases or in plastic pipes under the floor.

• in suspended ceilings.

• between the walls.

• in back of the walls.

Reach-in refrigeration fixtures can be either _______.

• self-contained or split systems with a remote condenser

• self-contained or package systems

• package or unitary systems

• parallel systems or rack systems

The mixing of hot gas with subcooled or saturated liquid could cause _______.

• frost to develop on the fins of the condenser

• acid to develop in the refrigerant oil

• compressor burn out

• liquid hammer

Large or small compressors on parallel compressor racks, which are usually dedicated to the coldest cases, are called

• Satellite compressors

• Remote compressors

• Booster compressors

• A and C

In a series heat reclaim system, the reclaim coil may not be sized to handle 100% of the heat rejected from the refrigeration system.

• True

• False

CO₂, ammonia, propane, butane, and isobutane are all types of ________.

• a. natural refrigerants

• b. synthetic refrigerants

• c. coil cleaning chemicals

• d. secondary fluids

What special valve is used in a refrigerated air drier?

• a. Four-way valve

• b. Defrost valve

• c. Three-way valve

• d. Hot gas bypass

The two main processes or cycles of CO₂ systems are the transcritical and supercritical cycles.

• True

• False

The two types of defrosts used with low-temperature fixtures are hot gas and electric defrost.

• True

• False

A refrigerant that has a both a Global Warming Potential (GWP) and an Ozone Depletion Potential (ODP) of 0 is _____.

• a. ammonia (R-717)

• b. carbon dioxide (R-744)

• c. HFC-404A

• d. HFC-134a