(Download) CBSE: Class XII Air Conditioning And Refrigeration Question Paper - 2020

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Question Papers For Board Examinations 2020

Class – XII

Subject –Air Conditioning And Refrigeration

Subject :- Air Conditioning And Refrigeration
Class : XII
Year : 2020

SECTION A

(Employability Skills) (10 Marks)
Answer any 4 questions out of the given 6 questions of 1 mark each. 14=4

1. What are communication skills ? 1
2. What do you mean by a slide ? 1
3. How can you delete the slides in a Slide Sorter View ? 1
4. How can you insert an audio in a slide ? 1
5. What are the barriers to Entrepreneurship ? 1
6. What are the Green jobs in Waste Reduction ? 1

Attempt any 3 questions out of given 5 questions of 2 marks each. 2x3=6

7. Name any two softwares used for creating a presentation. 2
8. Name any two ways to run a slideshow. 2
9. What are the common entrepreneurial competencies ? 2
10. Explain the steps in decision-making. 2
11. What are the Green jobs in Water Conservation ? 2

SECTION B

(Subject Skills) (50 Marks)
Answer any 10 questions out of the given 12 questions of 1 mark each. 1x10=10
12. The process involving heating without changing the moisture content is called ___________ . 1
13. ____________ is one of the modes of heat transfer. 1
14. While distributing air, temperature variation of more than _________ degrees should not be allowed. 1
15. In a refrigeration system, the component which cools the compressed gas is called ____________ . 1
16. In a refrigeration system, the component where liquid refrigerant converts into vapour is called __________ . 1
17. Which of the following is not an expansion device ? 1
(a) Capillary tube
(b) Float valve
(c) Solenoid valve
18. With which metal should ammonia gas not be used ? 1
19. Which device is used to start the motors ? 1
20. Name any one safety device in a refrigeration system. 1
21. Which type of air-conditioning system would you suggest for a shopping mall ? 1
22. In which capacities are window type air-conditioners commonly available ? 1
23. Give any method of detection of gas leakage. 1

Answer any 5 questions out of the given 7 questions of 2 marks each. 2x5=10

24. What is cooling with adiabatic humidification ? 2
25. Explain sensible heat gain. 2
26. Give any one method of air distribution in an air-conditioned space. 2
27. Give any two types of condensers used in a refrigeration system. 2
28. Which type of evaporator is used in a domestic refrigerator ? 2
29. Name any two refrigerant control devices. 2
30. Give applications of secondary refrigerants. 2

Answer any 5 questions out of the given 7 questions of 3 marks each.

31. Explain the process of cooling with dehumidification. 3
32. What do you understand by cooling load ? 3
33. Give the arrangement of air distribution through radial perimeter type of ducts. 3
34. Where do we use air-cooled condensers ? 3
35. What is special in a flooded type evaporator ? 3
36. Distinguish between actuating and sensing elements. 3
37. Give advantages of R11 type of refrigerant. 3

Answer any 3 questions out of the given 5 questions of 5 marks each.

38. Explain the factors affecting human comfort in an air-conditioning system. 5
39. Explain various systems of feeding conditioned air in an air-conditioned space. 5
40. Explain the function of a condenser in a refrigeration system. 5
41. What is defrosting ? Explain its various methods. 5
42. What properties of fluorocarbons make them suitable as a refrigerant ? 5