Refrigeration System Equipment Quiz

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

To compress the refrigerant from the evaporator

To remove heat from the hot vapour refrigerant (correct)

To divide the high pressure side and low pressure side

To absorb heat from the surrounding location

Where does the liquid refrigerant from the expansion device enter?

Compressor

Receiver

Evaporator (correct)

Condenser

What is the primary function of an evaporator in a refrigeration system?

To raise the pressure of the refrigerant

To divide the high pressure and low pressure sides

To absorb heat from the surroundings (correct)

To compress the refrigerant

Which equipment is responsible for dividing the high pressure side and low pressure side of a refrigeration system?

Expansion device Signup and view all the answers

What does a refrigerant compressor do in a refrigeration system?

Compresses the refrigerant from the evaporator Signup and view all the answers

Where is the expansion device usually located in a refrigeration system?

Between evaporator and receiver Signup and view all the answers

What type of compressor is best suited for refrigerants requiring relatively small displacement and operating at high pressure?

Reciprocating compressor Signup and view all the answers

Which type of compressor is ideal for handling refrigerants with large displacement and low condensing pressure?

Centrifugal compressor Signup and view all the answers

The rotary compressor is primarily used in which type of appliances?

Domestic refrigerators Signup and view all the answers

What type of compressors utilize the back and forth motion of a piston to compress refrigerant?

Reciprocating compressors Signup and view all the answers

Which diagram shows the clearance volume of a reciprocating compressor?

Figure 3.1 Signup and view all the answers

What is the term defined in positive displacement compressors to account for the difference between the in-built displacement and actual pumped volume?

Volumetric efficiency Signup and view all the answers

What does the clearance factor in reciprocating compressors represent?

Percentage of clearance volume compared to swept volume Signup and view all the answers

Which parameter is normally provided as clearance in reciprocating compressors?

0.005L + 0.5 mm Signup and view all the answers

What does the gas trapped in the clearance space do during operation of reciprocating compressors?

Expands from the suction pressure to condenser pressure. Signup and view all the answers

What phenomenon occurs in centrifugal compressors when the load decreases to below 35% of its rated capacity?

Surging Signup and view all the answers

How can the capacity of a centrifugal compressor be controlled?

Using a variable inlet whirl vanes Signup and view all the answers

What is one reason for employing a large diameter impeller or high rpm in centrifugal compressors?

To achieve high efficiency Signup and view all the answers

What does surging in centrifugal compressors lead to?

Stress conditions Signup and view all the answers

What is the purpose of varying the gas pressure in a centrifugal compressor?

To control capacity Signup and view all the answers

Why are rotary compressors used in low-temperature fields like chemical processing and cold storages?

Because of high volumetric efficiencies Signup and view all the answers

What is the key feature of rotary compressors that allows them to have high volumetric efficiencies?

Negligible clearance Signup and view all the answers

What happens to the seal between high-pressure and low-pressure sides when a rotary compressor stops?

It equalizes pressure. Signup and view all the answers

What is the role of oil in rotary compressors?

To form a seal between high-pressure and low-pressure sides. Signup and view all the answers

What is one method used to control the capacity of centrifugal compressors?

Using variable inlet whirl vanes. Signup and view all the answers

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

Condense the high pressure gas Signup and view all the answers

How do air-cooled condensers differ from water-cooled condensers?

Air-cooled condensers are more energy-efficient Signup and view all the answers

What type of movement is responsible for air circulation over natural convection condenser tubes?

Natural convection Signup and view all the answers

What is injected into a screw compressor to eliminate leakage and serve the purpose of cooling and lubricating?

Oil Signup and view all the answers

Which rotor in a rotary screw compressor is normally the driving rotor?

Male rotor with lobes Signup and view all the answers

How does a slide valve in a screw compressor contribute to capacity control?

By changing the volume of the compression chamber Signup and view all the answers

What type of refrigerants are typically used in positive displacement machines like screw compressors?

$R-22$ and ammonia Signup and view all the answers

What distinguishes a screw compressor from reciprocating compressors in terms of surging problems?

$Screw compressors$ have no surging problems compared to reciprocating compressors. Signup and view all the answers

What type of tubes are used for ammonia condensers to prevent the negative effects of ammonia on copper?

Steel tubes Signup and view all the answers

What feature is added to the holes in the tube sheets of water-cooled condensers to prevent tubes from getting loose?

Small grooves Signup and view all the answers

Why are removable water boxes provided at the ends of the condenser?

To facilitate brushing of the water tubes Signup and view all the answers

What does the bottom portion of the condenser serve as in some cases?

Receiver Signup and view all the answers

Why should care be taken not to overcharge the refrigeration system with the refrigerant?

To prevent hydraulic pressures Signup and view all the answers

What safety feature is fixed on the shell of the condenser to protect against excessive pressures?

Fusible plug Signup and view all the answers

What source of heat is used for vaporizing the water in evaporative condensers?

Refrigerant Signup and view all the answers

What problem is mentioned as the most troublesome point about evaporative condensers?

'Cleaning coil' difficulty Signup and view all the answers

What happens if hard layers of dirt or scale form on the surface of the evaporative condenser coil?

'Condenser capacity' decreases Signup and view all the answers

What is a major issue mentioned in relation to overcharging a refrigeration system with refrigerant?

Excessive hydraulic pressure formation. Signup and view all the answers

How is the liquid flow from the accumulator to the evaporator coil generally achieved?

By gravity Signup and view all the answers

What is the purpose of liquid eliminators provided in the accumulator top?

To prevent liquid carry-over to the suction line Signup and view all the answers

In a 'liquid-overfeed system', what is used to circulate the liquid from the accumulator to the evaporator coil?

Refrigerant liquid pump Signup and view all the answers

What do the terms 'natural convection' and 'forced convection' describe in a refrigeration system?

Modes of fluid cooling/circulation around the evaporator Signup and view all the answers

What does a 'liquid-suction heat exchanger' do in a refrigeration system?

Superheats the suction vapour Signup and view all the answers

In what way does the vapor formed by the vaporization of liquid rise from the evaporator coil to the top of the accumulator?

By rising up due to being lighter Signup and view all the answers

What happens to the suction volume and volumetric efficiency as the suction pressure decreases?

Decrease Signup and view all the answers

What effect does pressure drop on the suction side have on the pressure inside the cylinder during the suction stroke?

Rises after some distance traveled by the piston Signup and view all the answers

How can overall volumetric efficiency be improved in a reciprocating compressor?

Providing clearance as small as possible Signup and view all the answers

What is the main role of an impeller in a single-stage centrifugal compressor?

Transfer energy to the diffuser Signup and view all the answers

Which material is typically used for making the casing of a centrifugal compressor?

Cast iron Signup and view all the answers

What type of diffuser is normally preferred for better part load operation in a centrifugal compressor?

Vaneless diffuser Signup and view all the answers

Why is a natural convection condenser not capable of rejecting heat rapidly?

Air moves slowly by natural convection Signup and view all the answers

What is the purpose of welding wires to the condenser tubes in small refrigeration units?

To increase the mechanical strength of the coil Signup and view all the answers

Why are fins in forced-air circulation condenser coils closely spaced?

To prevent the accumulation of dirt and lint between fins Signup and view all the answers

What is an advantage of shell-and-tube condensers over tube-in-tube condensers?

Easier cleaning due to the coil design Signup and view all the answers

What is the purpose of providing a small gap between the plate-type condenser and the refrigerator cabinet?

To facilitate better natural convection air currents Signup and view all the answers

Why are widely-spaced fins used in some natural convection condenser designs?

To decrease resistance to air movement Signup and view all the answers

What is a disadvantage of tube-in-tube condensers compared to shell-and-coil condensers?

Inability to chemically clean the water side Signup and view all the answers

Why do fans or blowers play a crucial role in forced-air circulation condensers?

To move air at a certain velocity over the condenser coil. Signup and view all the answers

In small refrigeration units, why is steel generally preferred over copper in making condenser tubes?

Steel provides better mechanical strength. Signup and view all the answers

What could be a potential issue if a natural convection condenser is placed near an oven or warm location?

Impeded airflow over the condenser. Signup and view all the answers

What is the purpose of an evaporator in a cooling system?

To remove heat from the substance being cooled Signup and view all the answers

What is the main difference between a dry expansion evaporator and a flooded evaporator?

The maintenance of a constant liquid level Signup and view all the answers

How is the refrigerant state described in a direct expansion evaporator at the outlet?

Superheated vapor Signup and view all the answers

What determines the heat-transfer efficiency of a flooded evaporator?

The constant liquid level maintained Signup and view all the answers

Which component is responsible for controlling the rate of flow of refrigerant in a dry expansion evaporator?

Expansion valve Signup and view all the answers

What leads to an increase in the liquid level in a flooded evaporator?

Heat removal from the substance to be cooled Signup and view all the answers

What distinguishes a 'dry-expansion' evaporator from a 'flooded' evaporator?

'Dry' state of refrigerant at the outlet end Signup and view all the answers

What happens to liquid refrigerant that vaporizes in a flooded evaporator?

It becomes superheated vapor Signup and view all the answers

Which factor contributes to the relatively larger refrigerant charge in flooded evaporators compared to dry-expansion evaporators?

Maintaining a constant liquid level Signup and view all the answers

Refrigeration System Equipment Quiz

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Questions and Answers

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

Where does the liquid refrigerant from the expansion device enter?

What is the primary function of an evaporator in a refrigeration system?

Which equipment is responsible for dividing the high pressure side and low pressure side of a refrigeration system?

What does a refrigerant compressor do in a refrigeration system?

Where is the expansion device usually located in a refrigeration system?

What type of compressor is best suited for refrigerants requiring relatively small displacement and operating at high pressure?

Which type of compressor is ideal for handling refrigerants with large displacement and low condensing pressure?

The rotary compressor is primarily used in which type of appliances?

What type of compressors utilize the back and forth motion of a piston to compress refrigerant?

Which diagram shows the clearance volume of a reciprocating compressor?

What is the term defined in positive displacement compressors to account for the difference between the in-built displacement and actual pumped volume?

What does the clearance factor in reciprocating compressors represent?

Which parameter is normally provided as clearance in reciprocating compressors?

What does the gas trapped in the clearance space do during operation of reciprocating compressors?

What phenomenon occurs in centrifugal compressors when the load decreases to below 35% of its rated capacity?

How can the capacity of a centrifugal compressor be controlled?

What is one reason for employing a large diameter impeller or high rpm in centrifugal compressors?

What does surging in centrifugal compressors lead to?

What is the purpose of varying the gas pressure in a centrifugal compressor?

Why are rotary compressors used in low-temperature fields like chemical processing and cold storages?

What is the key feature of rotary compressors that allows them to have high volumetric efficiencies?

What happens to the seal between high-pressure and low-pressure sides when a rotary compressor stops?

What is the role of oil in rotary compressors?

What is one method used to control the capacity of centrifugal compressors?

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

How do air-cooled condensers differ from water-cooled condensers?

What type of movement is responsible for air circulation over natural convection condenser tubes?

What is injected into a screw compressor to eliminate leakage and serve the purpose of cooling and lubricating?

Which rotor in a rotary screw compressor is normally the driving rotor?

How does a slide valve in a screw compressor contribute to capacity control?

What type of refrigerants are typically used in positive displacement machines like screw compressors?

What distinguishes a screw compressor from reciprocating compressors in terms of surging problems?

What type of tubes are used for ammonia condensers to prevent the negative effects of ammonia on copper?

What feature is added to the holes in the tube sheets of water-cooled condensers to prevent tubes from getting loose?

Why are removable water boxes provided at the ends of the condenser?

What does the bottom portion of the condenser serve as in some cases?

Why should care be taken not to overcharge the refrigeration system with the refrigerant?

What safety feature is fixed on the shell of the condenser to protect against excessive pressures?

What source of heat is used for vaporizing the water in evaporative condensers?

What problem is mentioned as the most troublesome point about evaporative condensers?

What happens if hard layers of dirt or scale form on the surface of the evaporative condenser coil?

What is a major issue mentioned in relation to overcharging a refrigeration system with refrigerant?

How is the liquid flow from the accumulator to the evaporator coil generally achieved?

What is the purpose of liquid eliminators provided in the accumulator top?

In a 'liquid-overfeed system', what is used to circulate the liquid from the accumulator to the evaporator coil?

What do the terms 'natural convection' and 'forced convection' describe in a refrigeration system?

What does a 'liquid-suction heat exchanger' do in a refrigeration system?

In what way does the vapor formed by the vaporization of liquid rise from the evaporator coil to the top of the accumulator?

What happens to the suction volume and volumetric efficiency as the suction pressure decreases?

What effect does pressure drop on the suction side have on the pressure inside the cylinder during the suction stroke?

How can overall volumetric efficiency be improved in a reciprocating compressor?

What is the main role of an impeller in a single-stage centrifugal compressor?

Which material is typically used for making the casing of a centrifugal compressor?

What type of diffuser is normally preferred for better part load operation in a centrifugal compressor?

Why is a natural convection condenser not capable of rejecting heat rapidly?

What is the purpose of welding wires to the condenser tubes in small refrigeration units?

Why are fins in forced-air circulation condenser coils closely spaced?

What is an advantage of shell-and-tube condensers over tube-in-tube condensers?

What is the purpose of providing a small gap between the plate-type condenser and the refrigerator cabinet?

Why are widely-spaced fins used in some natural convection condenser designs?

What is a disadvantage of tube-in-tube condensers compared to shell-and-coil condensers?

Why do fans or blowers play a crucial role in forced-air circulation condensers?

In small refrigeration units, why is steel generally preferred over copper in making condenser tubes?

What could be a potential issue if a natural convection condenser is placed near an oven or warm location?

What is the purpose of an evaporator in a cooling system?

What is the main difference between a dry expansion evaporator and a flooded evaporator?

How is the refrigerant state described in a direct expansion evaporator at the outlet?

What determines the heat-transfer efficiency of a flooded evaporator?

Which component is responsible for controlling the rate of flow of refrigerant in a dry expansion evaporator?

What leads to an increase in the liquid level in a flooded evaporator?

What distinguishes a 'dry-expansion' evaporator from a 'flooded' evaporator?

What happens to liquid refrigerant that vaporizes in a flooded evaporator?

Which factor contributes to the relatively larger refrigerant charge in flooded evaporators compared to dry-expansion evaporators?

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Refrigeration System Equipment Quiz