Aux 2 Unit 9 Quiz 7

Aux 2 Unit 9 Q7

1 / 8

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

2 / 8

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

D) High wax content

A) High viscosity at all temperatures

C) High water content tolerance

B) Low pour point

3 / 8

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

A) To filter out impurities from the refrigerant

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

C) To increase the refrigerant pressure

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

4 / 8

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

D) On the suction line of the compressor

B) Between the condenser and the receiver

A) Between the evaporator and the expansion valve

C) On the discharge line of the compressor

5 / 8

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

B) By gravitational force only

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

D) By manually draining the oil periodically

A) By using a pump attached to the separator

6 / 8

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

A) To increase the system's cooling capacity

C) To reduce the size of the expansion valve

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

D) To eliminate the need for lubrication in the compressor

7 / 8

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

B) Low miscibility with refrigerants

A) High viscosity index

C) High miscibility with refrigerants

D) High water absorption rate

8 / 8

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

A) To increase the system's refrigerant charge

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

C) To change the chemical composition of the refrigerant

D) To reduce refrigerant flow through the condenser

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