With regard to their application in refrigeration systems, which of the following statements about flow switches is false?
a. They are used on chilled water systems
b. They are used as shutdowns or permissives when flow is insufficient
c. They are operated by the force exerted on a flexible vane immersed in the fluid flowing in the line
d. They can only be used to regulate liquid flow, not air flow
e. They can be used to close flow indicator circuits
Answer: D
Learn More :
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:
- 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:
- The expansion valve in a refrigeration system
- 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: