Fundamentals of Mechanical Engineering Unit 3 – Introduction to Refrigeration and Air-Conditioning: important questions for AKTU
Unit 3 (Introduction to Refrigeration and Air-Conditioning) questions that AKTU repeats most often. This unit carries about 22 marks per paper. Start with the repeated questions, then the most asked topics.
Most repeated Unit 3 questions
- Discuss in detail the construction and working of refrigerator with the help of diagrams. (7 marks, 2024, Domestic Refrigerator and Heat Pump) – also asked in 2021, 2022, 2023, 2025, 2026
- Explain the construction & working of a domestic refrigerator with a suitable diagram. Also, show all the components. (7 marks, 2025, Domestic Refrigerator and Heat Pump) – also asked in 2021, 2022, 2023, 2024
- Explain the working of a domestic refrigerator with a neat sketch. (10 marks, 2021, Refrigeration Fundamentals) – also asked in 2022, 2023, 2024, 2025
Most important Unit 3 topic
- Refrigeration Fundamentals (Unit 3: Introduction to Refrigeration and Air-Conditioning) – asked 17 times in 2021, 2022, 2023, 2024, 2025, 2026
Most asked Unit 3 topics
- Refrigeration Fundamentals – asked 17 times
- Air Conditioning Fundamentals – asked 9 times
- Domestic Refrigerator and Heat Pump – asked 6 times
More Unit 3 previous year questions
- Write down any two differences between efficiency and COP. (2 marks, 2026, Refrigeration Fundamentals)
- What are the factors affecting the performance of a domestic refrigerator? Discuss methods to improve or optimize its performance. (7 marks, 2026, Domestic Refrigerator and Heat Pump)
- A Carnot refrigerator operates between temperatures of –5°C and 35°C. If the refrigerator requires 3 kW of power input, determine: (i) Coefficient of Performance (COP) (ii) Refrigeration capacity in tons (7 marks, 2026, Refrigeration Fundamentals)
- It is proposed to heat a house using a heat pump outside air at 0°C is used as the heat source. Inside temperature of house is maintained at 30°C. The heating load estimated as 205600 KJ/hrs. Calculate the minimum power to drive the heat pump. (7 marks, 2026, Domestic Refrigerator and Heat Pump)
- Drive the expression for the coefficient of performance in refrigeration? (2 marks, 2025, Refrigeration Fundamentals)
Unit 3 syllabus topics
- Refrigeration Fundamentals
- Domestic Refrigerator and Heat Pump
- Air Conditioning Fundamentals
- Window Air Conditioner