The expansion valve in a refrigeration system
a. Expands the liquid to the receiver
b. Relieves high pressure in the receiver
c. Regulates the liquid refrigerant flow to the evaporator
d. Is used to charge the refrigeration system
e. Isolates the compressor from the condenser
Answer: C
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Power Engineering Chapter 118
- Safety controls serve what function?
- Which of the following actuating control valves is electromagnetically operated?
- Starting, stopping or unloading of the compressor is usually done by all of the following operating controls except
- The CSA B52 code requires that pressure limiting devices shall be provided on all systems operating above atmospheric pressure, except on a factory sealed system containing less than _____ of group A1 refrigerant:
- The safety control that uses a current transformer with a resistor in the motor circuit is known as:
- With regard to their application in refrigeration systems, which of the following statements about flow switches is false?
- A refrigeration compressor's oil pressure failure switch uses a _________ element as part of its operating mechanism.
- The oil-pressure failure switches of a mechanical refrigeration system
- An operating control, which consists of a hygroscopic element made of material similar to multiple strands of human hair, is called a:
- With regard to the high pressure side, the maximum setting for a pressure limiting device on a refrigeration system shall not exceed the pressure relief device setpoint by:
- With regard to a refrigeration system pressurestat, which of the following statements is false?
- In many cases, the evaporator pressure of a refrigeration system must not fall below a certain level, in order to prevent
- The refrigeration compressor's operating control that uses a bimetal element is a: