ACR 202 midterm

The two forces that control the EPR valve are the

• valve’s spring pressure and the liquid line pressure

  
  

• evaporator pressure and the valve’s spring pressure

• liquid line pressure and the suction line pressure

• suction line pressure and the evaporator pressure

Refrigerant relief valves come in two different types

• electronic and mechanical

• mechanical and one-type

• spring-loaded and one-time

During an automatic pumpdown, the refrigerant is stored in the

• Condenser and receiver

• Receiver

• condenser

• evaporator

Any evaporator that operates below 32°F?

• Needs a ERV

• needs a TXV

• requires some form of defrost

• needs a heating blanket

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

• the evaporator

• the condenser

• the compressor

• the filter

Two types of off-cycle defrost are:

• hot gas

• cool gas

• Planned and random

• Mechanical heat

The purpose of the crankcase pressure-regulating valve is to

• to prevent a compressor overload condition

• maintain pressure

• head pressure regulation

To remove condensate, self-contained equipment can _______.

• evaporate it using heat given off by the compressor

• pump it back to the evaporator

• pump it back to the condenser

A type of reach-in system that can be designed with an open top or lids, is normally placed against a wall, and can be either self-contained or split with a remote condenser is a _________.

• counter cooler

• walk in freezer

• parallel rack system

• chest type

Walk-in refrigeration equipment is either ___________ type.

• knock down or permanent

• residential or commercial

• mechanical or electrical