3B2 E2.5 C10 Review

Which class of refrigerants is non-toxic and non-flammable?

What is the heat of combustion threshold that classifies a refrigerant as a Class 2 refrigerant?

Which refrigerant is a member of the HCFC group and is highly stable?

At what temperature does Refrigerant R-12 boil at atmospheric pressure?

What is a property that makes Refrigerant R-12 suitable for various temperature applications?

What effect does R-12 have on the earth's ozone layer and greenhouse effect?

Which refrigerant has been widely used in automotive air conditioning systems?

What is the primary use of Refrigerant R-22 today?

Which category of refrigerants has a higher flammability limit than 0.10 kg/m3?

What could be a reason that synthetic oils are used with R-22?

Which refrigerant is being used to replace R-12 in automotive air conditioning systems?

Which refrigerant is the only one outside of the fluorocarbon group that is used to a great extent?

Which refrigerant has a boiling point of -33.3°C at atmospheric pressure?

Which refrigerant is non-flammable and non-explosive?

Which refrigerant is not miscible in oil and does not dilute the oil in the compressor crankcase?

Which refrigerant has a miscibility problem with mineral oil lubricants?

What is a key criterion for a refrigerant to be considered environmentally safe?

Why is a refrigerant's latent heat of evaporation important?

What do ASHRAE Standard 34 and CSA Mechanical Refrigeration Code B52 classify refrigerants based on?

In the context of refrigerants, what does toxicity refer to?

What is a desirable property of a refrigerant in terms of its odor?

What is a key consideration when evaluating the environmental safety of a refrigerant?

Which refrigerant needs the use of ester-based synthetic lubricants to eliminate a miscibility problem with mineral oil lubricants?

What is a characteristic of R-134a that distinguishes it from R-717?

Why should copper and brass not be used in ammonia systems?

Which refrigerant has the most widely used thermal properties in the food industry?

In the presence of moisture, what property of ammonia leads to corrosion of nonferrous metals like copper and brass?

Which of the refrigerants mentioned is the least expensive among the commonly used ones?

What does the numerical part of the refrigerant classification identify?

What is the heat of combustion threshold for a Class 2 refrigerant?

Which refrigerant contains chlorine molecules that contribute to ozone layer depletion and global warming?

At what temperature does Refrigerant R-22 boil at atmospheric pressure?

What is a major reason for the gradual replacement of Refrigerant R-12?

Which refrigerant is non-toxic, non-flammable, and non-explosive?

What characteristic makes Refrigerant R-12 suitable for various temperature applications?

What effect do refrigerants with long atmospheric life have on the environment?

Which refrigerant group has a shorter atmospheric life than CFCs?

What does the lower flammability limit (LFL) indicate about a refrigerant?

Which refrigerant group classification poses the highest risk in terms of both toxicity and flammability?

Which of the following is NOT a criteria for a refrigerant that contributes to its environmental safety?

Which statement about refrigerant leaks is correct, assuming all other properties are equal?

Which refrigerant property would make it suitable for use in systems that require low pressure refrigeration?

Which refrigerant property is crucial for boosting the refrigeration cycle’s effectiveness?

Which of these refrigerant properties would be most vital when using a refrigerant near foodstuffs or other products?

What is the primary function of the compressor in an ammonia refrigeration system?

What is the purpose of the Oil Separator in an ammonia refrigeration system?

What type of design is often used for single-acting reciprocating compressors?

What is the role of cylinder unloaders in a reciprocating compressor?

What is the purpose of an oil foam breaker in a compressor?

What is the principle of operation of a vane type compressor?

What is the function of the condenser in an ammonia refrigeration system?

What is the role of the liquid receiver in an ammonia refrigeration system?

What is the function of the expansion valve in an ammonia refrigeration system?

What is the primary use of Refrigerant R-22 today?

What is the primary function of the fan in the condenser?

What is the purpose of the liquid receiver in the refrigeration system?

What type of valve is used to meter the liquid refrigerant into the evaporator?

What is the purpose of the fins in a finned tube evaporator?

What is the function of the evaporator in the refrigeration system?

What is the name of the type of evaporator where a continuous coil of tubing is contained between two metal plates?

What is the temperature of the liquid ammonia as it enters the low-pressure section of the system?

What is the boiling temperature of ammonia at a pressure of 135 kPa?

What happens to the temperature of the refrigerant vapour as it passes through the upper section of the evaporating coils?

What is the effect of insufficient ammonia passing through the expansion valve?

What is the superheat of the refrigerant vapour leaving the evaporator?

What is the pressure of the low-pressure side of the system?

What is the primary function of a condenser in a refrigeration system?

What is a characteristic of rotary compressors?

What type of compressor is particularly suited for refrigeration systems with a large volume of refrigerant and small to moderate pressure difference?

What is the advantage of air-cooled condensers?

What is the function of the diffuser section in a centrifugal compressor?

What is a disadvantage of centrifugal compressors?

What type of condenser uses both air and water for cooling?

What is the purpose of the gear type oil pump in a centrifugal compressor?

Why do centrifugal compressors require less maintenance?

What is the primary function of the liquid receiver in a refrigeration system?

In a finned tube evaporator, what is the main function of the fins attached to the tubes?

What is the purpose of the needle-type expansion valve in a refrigeration system?

Where does refrigerant primarily evaporate in an evaporator in a water-cooling system?

What is the distinguishing feature of a forced draft condenser compared to an induced draft condenser?

What is the function of a plate surface evaporator in a refrigeration system?

What is the purpose of the oil separator in the refrigeration system?

In an ammonia refrigeration system, what is the function of the compressor?

What is the major role of the oil purifier in the refrigeration system with respect to the oil removed from the system?

Which component in an ammonia refrigeration system is responsible for sub-cooling the refrigerant before it enters the receiver?

What type of refrigeration compressor is commonly used in household refrigerators?

Which design of rotary compressor functions by trapping refrigerant between vanes and the casing, achieving compression by reducing space as the refrigerant moves?

What is a distinctive feature of a roller type rotary compressor in terms of roller rotation?

What is the primary objective of the evaporator in a refrigeration system?

Which component is primarily responsible for ensuring that the pressure differential is sufficient in the refrigeration system?

In the ammonia system, what is the purpose of the Liquid Receiver?

What is the temperature of the liquid ammonia as it enters the low-pressure side of the system?

What happens to the temperature of the vapour-liquid mixture as the 28°C liquid enters the low-pressure section?

Why does the refrigerant vapour become superheated as it passes through the upper section of the evaporating coils?

What is the boiling temperature of ammonia at a pressure of 135 kPa?

What is the purpose of the refrigerant vapour absorbing heat from the air surrounding the coils in the evaporator?

What is the superheat of the refrigerant vapour leaving the evaporator?

In a rotary compressor, what is the purpose of the spring-loaded blade?

What is the main advantage of centrifugal compressors?

What type of condenser uses both air and water for cooling?

What is the purpose of the diffuser section in a centrifugal compressor?

Why are rotary compressors expensive to manufacture?

What is the purpose of the fan in an evaporative condenser?

What is a disadvantage of centrifugal compressors?

What is the purpose of the gear type oil pump in a centrifugal compressor?

What type of compressor is suitable for refrigeration systems with a large volume of refrigerant and small to moderate pressure difference?

What absorbs heat in the evaporator of a refrigeration system?

What maintains a constant level of liquid refrigerant in the evaporator of a refrigeration system?

Where does the resulting refrigerant liquid collect after condensing in a refrigeration system?

What is the purpose of the crossover pipe in a centrifugal compression system?

What is the term used for the phase change process in which refrigerant gas becomes liquid in a condenser?

Which component of the refrigeration system is responsible for withdrawing the vaporized refrigerant from the evaporator?

What is a characteristic of a direct refrigeration system?

What is the function of the brine in an indirect refrigeration system?

What is the typical temperature to which the brine is cooled in a skating rink application?

What is a common type of brine used in indirect refrigeration systems?

In an air conditioning system, what is commonly used as the brine in indirect refrigeration?

What is the purpose of the evaporator coils in an indirect refrigeration system?

Which type of compressor is used in the air conditioning system described in the text?

What process occurs in the condenser of the air conditioning system described in the text?

What is the role of the evaporator float valve in the described air conditioning system?

What happens to the refrigerant once it leaves the evaporator in the described air conditioning system?

What is the primary use of the chilled water in the described air conditioning system?

How many stages does the centrifugal compressor used in the described air conditioning system have?

What is the primary objective of using a brine solution in indirect refrigeration systems?

What is the typical operating temperature of the brine solution in a skating rink application?

What is the purpose of the evaporator coils in an indirect refrigeration system?

Which of the following is NOT a type of brine solution used in indirect refrigeration systems?

What is the primary advantage of using an indirect refrigeration system over a direct system?

In an air conditioning system, what is commonly used as the brine in indirect refrigeration?

What is the purpose of the economizer in the given refrigeration system?

What happens to superheated vapour leaving the low-pressure cylinder?

What is the purpose of the connection from the top of the still to the low-pressure suction?

What is a common misconception about two-stage reciprocating compressors?

What type of compressor has largely replaced two-stage reciprocating compressors?

What is the function of the intercooler in the given refrigeration system?

How does the duplex compressor in the indirect refrigeration system facilitate low temperature operation?

What is the role of the liquid cooler in the indirect refrigeration system?

How does the connection from the top of the still to the low-pressure suction contribute to the performance of the indirect refrigeration system?

What is the primary reason two-stage reciprocating compressors have been largely replaced by rotary compressors?

What is the purpose of the intercooler in the indirect refrigeration system?

How does the drain system in the indirect refrigeration system contribute to the overall efficiency of the system?

What is the function of the rotary compressor in a two-stage refrigeration system?

Why is an intercooler used in a two-stage refrigeration system?

What is the role of the liquid and gas cooler in a two-stage refrigeration system?

What happens to the pressurized vapour after leaving the condenser in a two-stage refrigeration system?

What is the purpose of the oil separator in a two-stage refrigeration system?

In a two-stage refrigeration system, why does the low-pressure side require a large volume handling capacity?

What is the purpose of a booster compressor in a multi-stage refrigeration plant?

What is the name of the part that receives the cooled and condensed refrigerant before it is used in a refrigeration system?

Which component in the refrigeration system is responsible for removing oil from the discharged vapour before it enters the condenser?

What is the function of the intercooler in a multi-stage refrigeration system?

In which stage of the refrigeration system does the vapour from the low-temperature evaporator enter the 1st stage compressor?

What happens to the volume of a kilogram of vapour from the evaporator as it transitions through the refrigeration system?

What is the purpose of a water-cooled intercooler in a multi-stage refrigeration system?

Why is the compression divided between two single-stage compressors in the described refrigeration system?

How does the water-cooled intercooler impact the high-pressure compressor in the multi-stage refrigeration system?

What is the role of the regulator or expansion valve in a compression refrigeration system?

How does the water-cooled intercooler help before the refrigeration system enters the high-pressure compressor?

What is the purpose of a water-cooled intercooler in a multi-stage refrigeration system?

What effect does the water-cooled intercooler have on the size and power consumption of the high-pressure compressor in a multi-stage refrigeration system?

How does the water-cooled intercooler contribute to the overall efficiency of a multi-stage refrigeration system?

In a multi-stage refrigeration system, what is the function of the water-cooled intercooler with regards to the refrigerant vapour?

How does the water-cooled intercooler impact the performance of the high-pressure compressor in a multi-stage refrigeration system?

How does the water-cooled intercooler reduce the size and power consumption of the high-pressure compressor in a multi-stage refrigeration system?

What is the main disadvantage of using ammonia as a refrigerant in a multi-stage refrigeration system?

How does the use of two single-stage compressors in a multi-stage refrigeration system impact the overall efficiency of the system compared to a single two-stage compressor?

What is the primary function of the fan in the condenser in a refrigeration system?

Which type of compressor is commonly used in household refrigerators?

What is the primary purpose of the analyzer in an ammonia absorption refrigeration system?

What is the role of the rectifier in an ammonia absorption refrigeration system?

What happens to the ammonia as it passes through the control or expansion valve?

What is the purpose of the heat exchanger in the ammonia absorption refrigeration system?

What is the role of the generator in an ammonia absorption refrigeration system?

What is the temperature at which the ammonia boils in the evaporator?

What is the primary purpose of the analyzer in the ammonia absorption refrigeration system?

What is the pressure of the ammonia vapour as it leaves the generator?

What happens to the remaining water vapour in the rectifier?

What is the purpose of the control or expansion valve?

At what temperature does the ammonia boil in the evaporator?

What is the purpose of the heat exchanger in the analyzer?