Aux 2 Unit 9 Quiz 7

Aux 2 Unit 9 Q7

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What is the main function of an oil separator in a refrigeration system?

A) To filter out impurities from the refrigerant

D) To cool the refrigerant before it enters the expansion valve

B) To separate oil from the refrigerant and return it to the compressor

C) To increase the refrigerant pressure

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Which of the following is a key property of refrigeration oil?

B) Low pour point

C) High water content tolerance

D) High wax content

A) High viscosity at all temperatures

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What is another benefit of using an oil separator in a refrigeration system?

A) To increase the system's refrigerant charge

D) To reduce refrigerant flow through the condenser

C) To change the chemical composition of the refrigerant

B) To enhance the system's energy efficiency by maintaining proper oil levels in the compressor

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Why is an oil separator used in vapor compression refrigeration systems?

C) To reduce the size of the expansion valve

A) To increase the system's cooling capacity

B) To prevent oil from entering the evaporator and affecting heat transfer

D) To eliminate the need for lubrication in the compressor

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Which property of refrigeration oil helps prevent the formation of sludge and deposits?

B) High chemical stability

A) High wax content

D) Low thermal conductivity

C) High moisture content

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Where is an oil separator typically installed in a refrigeration system?

C) On the discharge line of the compressor

A) Between the evaporator and the expansion valve

D) On the suction line of the compressor

B) Between the condenser and the receiver

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What property of refrigeration oil is important for compatibility with refrigerants?

B) Low miscibility with refrigerants

C) High miscibility with refrigerants

A) High viscosity index

D) High water absorption rate

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How does an oil separator return separated oil to the compressor?

A) By using a pump attached to the separator

C) By using a float valve that opens when sufficient oil accumulates

B) By gravitational force only

D) By manually draining the oil periodically

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