ACR-202 Assessment Review Ch25-27

Which is not a basic component of the compression refrigeration cycle?

• Compressor

• Condenser

• Evaporator

• Suction Line

Two-temperature operation of a refrigeration system is necessary when ____.

• more than one evaporator is used with a compressor

• the compressor must be protected from overloading

• a multiple-circuit distributor is used

• the coil in the evaporator is excessively long

Low-temperature refrigeration systems utilize off-cycle or hot gas defrost cycles.

• True

• False

A suction line accumulator is used to ensure that liquid refrigerant enters the compressor.

• True

• False

EPR valves are also referred to as ____ valves.

• ORC

• DRP

• ORI

• ORN

Frequently on smaller condensing units, one fan will run continuously and the other fan will be cycled on and off with a(n) ____.

• thermal control valve

• ambient pressure valve

• ambient temperature controller

• thermal expansion valve

The purpose of the crankcase pressure-regulating valve is to

• prevent a compressor from going into a vacuum.

• prevent a compressor overload condition.

• maintain constant pressure in the evaporator.

• maintain constant pressure in the crankcase.

To protect the compressor during periods of hot pull down, a(n) ____ valve is used.

• EPR (evaporator pressure regulator)

• CPR (crankcase pressure regulator)

• TXV (thermostatic expansion valve)

• LAC (low ambient control)

Automatic pumpdown systems are equipped with a(n) to prevent refrigerant from reaching the evaporator.

• solenoid valve

• TXV

• high pressure switch

• low pressure switch

The refrigeration compressor motor can be operated at about ____% over its rated capacity without harm during the pulldown.

• 5

• 15

• 20

• 10