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Questions and Answers
What is the function of a refrigerant compressor in a refrigeration system?
What is the function of a refrigerant compressor in a refrigeration system?
- To divide the high pressure side and low pressure side
- To compress the refrigerant and raise its pressure (correct)
- To cool down the refrigerant
- To remove heat from the hot vapor refrigerant
Where does the evaporator operate in a refrigeration system?
Where does the evaporator operate in a refrigeration system?
- Low pressure side (correct)
- Expansion device side
- High pressure side
- Compressor side
What is the main function of an evaporator in a refrigeration system?
What is the main function of an evaporator in a refrigeration system?
- To remove heat from the hot vapor refrigerant
- To cool down the refrigerant
- To absorb heat and change liquid refrigerant into vapor (correct)
- To raise the refrigerant's pressure
Where is the condenser located in a refrigeration system?
Where is the condenser located in a refrigeration system?
What is the purpose of the expansion device in a refrigeration system?
What is the purpose of the expansion device in a refrigeration system?
Why must the temperature of the boiling refrigerant in the evaporator be lower than that of the surrounding medium?
Why must the temperature of the boiling refrigerant in the evaporator be lower than that of the surrounding medium?
Which type of compressor is best suited for refrigerants with moderate or low condensing pressures like R-21 and R-114?
Which type of compressor is best suited for refrigerants with moderate or low condensing pressures like R-21 and R-114?
What type of compressor is recommended for refrigerants that require a large displacement and operate at low condensing pressure?
What type of compressor is recommended for refrigerants that require a large displacement and operate at low condensing pressure?
What defines the ratio of the clearance volume to the swept volume in reciprocating compressors?
What defines the ratio of the clearance volume to the swept volume in reciprocating compressors?
Which component in a reciprocating compressor expands from discharge pressure to suction pressure, filling part of the cylinder space before suction begins?
Which component in a reciprocating compressor expands from discharge pressure to suction pressure, filling part of the cylinder space before suction begins?
What is the primary motion involved in compressing the vapour refrigerant in reciprocating compressors?
What is the primary motion involved in compressing the vapour refrigerant in reciprocating compressors?
Which type of compressor is commonly used in domestic refrigerators?
Which type of compressor is commonly used in domestic refrigerators?
What type of refrigerants are reciprocating and screw compressors best suited for?
What type of refrigerants are reciprocating and screw compressors best suited for?
What is the volume that remains in the cylinder during the operation cycle of a reciprocating compressor?
What is the volume that remains in the cylinder during the operation cycle of a reciprocating compressor?
Which factor is normally around 5% and represents the effect of clearance on reducing the volume of sucked vapour in reciprocating compressors?
Which factor is normally around 5% and represents the effect of clearance on reducing the volume of sucked vapour in reciprocating compressors?
In a reciprocating compressor, when does the discharge valve open?
In a reciprocating compressor, when does the discharge valve open?
What happens to the volumetric efficiency of a reciprocating compressor as suction pressure decreases?
What happens to the volumetric efficiency of a reciprocating compressor as suction pressure decreases?
What effect does wire-drawing at the valves have on the overall volumetric efficiency of a compressor?
What effect does wire-drawing at the valves have on the overall volumetric efficiency of a compressor?
Which method is NOT mentioned as a way to improve the volumetric efficiency of a reciprocating compressor?
Which method is NOT mentioned as a way to improve the volumetric efficiency of a reciprocating compressor?
What role does the diffuser play in a single-stage centrifugal compressor?
What role does the diffuser play in a single-stage centrifugal compressor?
Which material is commonly used for making the impeller of a centrifugal compressor?
Which material is commonly used for making the impeller of a centrifugal compressor?
What is the effect of a large clearance volume on the volumetric efficiency of a reciprocating compressor?
What is the effect of a large clearance volume on the volumetric efficiency of a reciprocating compressor?
How does the pressure drop across suction and discharge valves affect their operation in a compressor?
How does the pressure drop across suction and discharge valves affect their operation in a compressor?
What happens to the refrigerating capacity of a reciprocating compressor with decreasing evaporator pressure?
What happens to the refrigerating capacity of a reciprocating compressor with decreasing evaporator pressure?
What is the main reason for the effect of clearance volume on the work of compression in a reciprocating compressor?
What is the main reason for the effect of clearance volume on the work of compression in a reciprocating compressor?
What is the purpose of an inlet casing in a single-stage centrifugal compressor?
What is the purpose of an inlet casing in a single-stage centrifugal compressor?
What is the purpose of a condenser in a refrigeration system?
What is the purpose of a condenser in a refrigeration system?
How does a rotary screw compressor function?
How does a rotary screw compressor function?
What is the primary advantage of a screw compressor over reciprocating compressors?
What is the primary advantage of a screw compressor over reciprocating compressors?
What function does the slide valve serve in a screw compressor?
What function does the slide valve serve in a screw compressor?
How do air-cooled condensers differ from water-cooled condensers?
How do air-cooled condensers differ from water-cooled condensers?
Why are high pressure refrigerants like R-22 and ammonia used in screw compressors?
Why are high pressure refrigerants like R-22 and ammonia used in screw compressors?
How many basic continuous phases are involved in the working cycle of a screw compressor?
How many basic continuous phases are involved in the working cycle of a screw compressor?
What type of rotors does a rotary screw compressor have?
What type of rotors does a rotary screw compressor have?
What eliminates leakage in a screw compressor?
What eliminates leakage in a screw compressor?
Why is oil injected into a screw compressor?
Why is oil injected into a screw compressor?
What is the main limitation of a natural convection condenser?
What is the main limitation of a natural convection condenser?
Which material is generally used for the condenser tubes in small refrigeration units?
Which material is generally used for the condenser tubes in small refrigeration units?
What purpose do the wires welded to the condenser tubes serve?
What purpose do the wires welded to the condenser tubes serve?
Why are fins in forced-air circulation condensers closely spaced?
Why are fins in forced-air circulation condensers closely spaced?
In a water cooled condenser, what issue can arise due to impurities present in water?
In a water cooled condenser, what issue can arise due to impurities present in water?
What is the purpose of the shell in a shell-and-coil condenser?
What is the purpose of the shell in a shell-and-coil condenser?
Why are intermediate tube supports provided in a shell-and-tube condenser?
Why are intermediate tube supports provided in a shell-and-tube condenser?
How does the liquid flow from the accumulator to the evaporator coil?
How does the liquid flow from the accumulator to the evaporator coil?
What prevents the carry-over of liquid particles from the accumulator to the suction line?
What prevents the carry-over of liquid particles from the accumulator to the suction line?
In a 'liquid-overfeed system', how is the refrigerant circulated from the accumulator to the evaporator coil?
In a 'liquid-overfeed system', how is the refrigerant circulated from the accumulator to the evaporator coil?
What is the purpose of a liquid- suction heat exchanger on the suction line?
What is the purpose of a liquid- suction heat exchanger on the suction line?
In what way does 'dry expansion' differ from 'flooded' in refrigeration systems?
In what way does 'dry expansion' differ from 'flooded' in refrigeration systems?
What describes 'natural convection' in cooling/circulating a fluid around the evaporator?
What describes 'natural convection' in cooling/circulating a fluid around the evaporator?
What phenomenon in centrifugal compressors occurs when the load decreases to below 35 per cent of the rated capacity?
What phenomenon in centrifugal compressors occurs when the load decreases to below 35 per cent of the rated capacity?
What is one of the methods mentioned to control the capacity of centrifugal compressors?
What is one of the methods mentioned to control the capacity of centrifugal compressors?
What is the purpose of a speed-reduction gear in centrifugal compressors?
What is the purpose of a speed-reduction gear in centrifugal compressors?
In a rolling piston type rotary compressor, what role does the spring play?
In a rolling piston type rotary compressor, what role does the spring play?
Why are rotary compressors preferred for low-temperature applications in chemical and industrial processing?
Why are rotary compressors preferred for low-temperature applications in chemical and industrial processing?
What contributes to achieving high tip speeds in centrifugal compressors?
What contributes to achieving high tip speeds in centrifugal compressors?
What causes surging in centrifugal compressors?
What causes surging in centrifugal compressors?
How does capacity control vary in rotary compressors as compared to centrifugal compressors?
How does capacity control vary in rotary compressors as compared to centrifugal compressors?
Which component in rotary compressors ensures the seal between high-pressure and low-pressure sides?
Which component in rotary compressors ensures the seal between high-pressure and low-pressure sides?
In a water-cooled condenser, how is the overall resistance calculated?
In a water-cooled condenser, how is the overall resistance calculated?
What is the purpose of the expansion valve in a dry expansion evaporator?
What is the purpose of the expansion valve in a dry expansion evaporator?
Why is a flooded evaporator more efficient in terms of heat transfer?
Why is a flooded evaporator more efficient in terms of heat transfer?
How is the refrigerant supplied to a dry expansion evaporator?
How is the refrigerant supplied to a dry expansion evaporator?
What distinguishes a dry expansion evaporator from a flooded evaporator?
What distinguishes a dry expansion evaporator from a flooded evaporator?
Which component contributes to maintaining a constant liquid level in a flooded evaporator?
Which component contributes to maintaining a constant liquid level in a flooded evaporator?
What happens to the refrigerant in a direct expansion evaporator as it passes through?
What happens to the refrigerant in a direct expansion evaporator as it passes through?
What does the cooling process involve in an evaporator?
What does the cooling process involve in an evaporator?
Which factor determines the heat-transfer efficiency of a flooded evaporator?
Which factor determines the heat-transfer efficiency of a flooded evaporator?
Why is an expansion device crucial in a refrigeration system?
Why is an expansion device crucial in a refrigeration system?
What type of tubes are used in ammonia condensers to prevent the effects of ammonia on copper?
What type of tubes are used in ammonia condensers to prevent the effects of ammonia on copper?
What is the purpose of the small grooves in the holes of the tube sheets?
What is the purpose of the small grooves in the holes of the tube sheets?
Why are removable water boxes provided at the ends of the condenser?
Why are removable water boxes provided at the ends of the condenser?
What is the purpose of extra rows of water tubes provided at the lower end of some condensers?
What is the purpose of extra rows of water tubes provided at the lower end of some condensers?
Why is it important not to overcharge the refrigeration system with refrigerant?
Why is it important not to overcharge the refrigeration system with refrigerant?
What safety feature is fixed on the shell of the condenser to protect against excessive pressures?
What safety feature is fixed on the shell of the condenser to protect against excessive pressures?
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