Refrigeration Questions

Refrigeration is an artificial cooling method used to remove the heat from an enclosed space. Both the air conditioner and the refrigerator use a heat sink to transfer heat and cool the temperature of a closed space. Refrigeration is employed in air conditioning, refrigerators, cryogenics, and industrial freezers. It includes four main components – Evaporator, Compressor, Condenser, and Expansion valve.

Refrigerators work on the second law of thermodynamics. William Cullen was the first person to show the process of artificial refrigeration.

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Important Refrigeration Questions with Answers

1. List three refrigerants.

Three refrigerants are chlorofluorocarbons, ammonia, and carbon dioxide.

2. Refrigeration refers to the process of _____

1. Maintaining the temperature constant
2. Cooling the space
3. Heating the space
4. None of the above options

Answer: b) Cooling the space.

Explanation: The process of cooling the space is known as refrigeration.

3. Who was the first person to demonstrate the process of artificial refrigeration?

William Cullen was the first person to show the process of artificial refrigeration.

4. Choose YES or NO: Are most of the refrigerants flammable?

1. YES
2. NO

Answer: a) YES

Explanation: Most historical refrigerants are flammable.

5. State TRUE or FALSE: The refrigerant helps absorb heat from the food kept in a refrigerator.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: Yes, the refrigerant aids in absorbing heat from the food kept in a refrigerator.

6. A set of tubes with external fins placed at the back of the refrigerator is known as ______

1. Evaporator
2. Compressor
3. Condenser
4. Expansion valve

Answer: c) Condenser

Explanation: The condenser features a set of tubes with external fins and is placed at the back of the refrigerator.

7. _____ refrigerant is the primary medium used in gas processing.

1. Carbon dioxide
2. Ammonia
3. Propane
4. CFC

Answer: c) Propane

Explanation: Propane is mainly used in compression refrigeration and is widely used in industrial refrigeration.

8. Choose the correct answer: When a liquid is rapidly vaporised, it expands ______

1. slowly
2. quickly

Answer: b) Quickly

Explanation: liquid expands quickly when it is rapidly vaporised.

9. Refrigerators work on the principle of _____

1. The zeroth law of thermodynamics
2. The first law of thermodynamics
3. The second law of thermodynamics
4. The third law of thermodynamics

Answer: c) The second law of thermodynamics.

Explanation: Refrigerators work on the principle of the second law of thermodynamics.

10. State true or false: In refrigeration, heat is removed from a low-temperature reservoir and transferred to a high-temperature reservoir.

1. TRUE
2. FALSE

Answer: a) TRUE

Explanation: In refrigeration process heat is transferred from low-temperature reservoir to a high-temperature reservoir.

Practice Questions

1. Define refrigeration.
2. Explain the components in the refrigerator system.
3. What is a refrigerant?
4. Is methane a refrigerant?
5. Explain the working of the condenser.