CBSE Class 12 Marking Scheme 2022 for Air Conditioning and Refrigeration

CBSE | DEPARTMENT OF SKILL EDUCATION AIR CONDITIONING AND REFRIGERATION (SUBJECT CODE-827) CLASS XII (SESSION 2021-2022) MARKING SCHEME FOR TERM -1 Max. Time Allowed: 90 Minutes (1½ Hrs.) Max. Marks: 30 General Instructions: 1. Please read the instructions carefully 2. This Question Paper is divided into 03 sections, viz., Section A, Section B and Section C. 3. Section A is of 05 marks and has 06 questions on Employability Skills. 4. Section B is of 20 marks and has 25 questions on Subject Specific Skills. 5. Section C is of 05 marks and has 07 competency-based questions. 6. Do as per the instructions given in the respective sections. 7. Marks allotted are mentioned against each section/question. 8. All questions must be attempted in the correct order SECTION A Answer any 5 questions out of the given 6 questions on Employability Skills (1 x 5 = 5 marks) 1. ANSWER-(d)Activities, Books and Music 2. ANSWER-(a)Standard bar 1 3. ANSWER-(a)Two 1 4. ANSWER-(d)Ctrl + Z 1 5. ANSWER-(b)Society, Family and Culture 1 6. ANSWER-(c)Eight 1 SECTION B Answer any 20 questions out of the given 25 questions (1 x 20 = 20 marks) 7. ANSWER-(b)Condenser 1 8. ANSWER-(c)Latent and sensible heat load both 1 9. ANSWER-(d)Water 1 10. ANSWER-(b)Increase 1 11. ANSWER-(a)Forced convection air cooled condensers 1 12. ANSWER-(d)Thermal insulating material 1 827-MS-XII-Term 1(2021-22) 1

13. ANSWER-(b)Below the D.P.T. of air 1 14. ANSWER-(c)Chilling of milk 1 15. ANSWER-(c)Automatic expansion valve 1 16. ANSWER-(c)Ducts 1 17. ANSWER-(d)Natural convection condenser 1 18. ANSWER-(b)Increase the heat transfer rate 1 19. ANSWER-(b)Dry expansion evaporator 1 20. ANSWER-(d)Air cleaning, Humidification and Dehumidification 1 21. ANSWER-(c)Plate type natural convection evaporator 1 22. ANSWER-(d)Capillary tube 1 23. ANSWER-(c)Right to left 1 24. ANSWER-(a)Loop perimeter system 1 25. ANSWER-(c)Expansion device 1 26. ANSWER-(b)Stream 1 27. ANSWER-(c)Liquid refrigerant 1 28. ANSWER-(a)Left to right 1 29. ANSWER-(b)Dirt, Moisture and Foreign particles 1 30. ANSWER-(b) Thermal conductivity 1 31. ANSWER-(d) D.B.T. of air 1 SECTION C (COMPETENCY BASED QUESTIONS) Answer any 5 questions out of the given 7 questions (1 x 5 = 5 marks) 32. ANSWER-(c) Sensible and latent heat both 1 33. ANSWER-(b) D.B.T. of air 1 34. ANSWER-(c) Radiation 1 35. ANSWER-(d) Specific humidity 1 36. ANSWER-(b) Anemometer 1 37. ANSWER-(d) Fe 1 38. ANSWER-(b) Diameter of the capillary tube 1 827-MS-XII-Term 1(2021-22) 2