1. What do you understand by term refrigeration and a refrigerating machine?

2. Where do we find the applications of Refrigeration?

3. Is transfer of heat on its own a spontaneous process or not? If yes, then why?
4. Which law of thermodynamic validate this statement?
5. What is the difference between efficiency and Energy Ratios?
6. Difference between cooling energy ratio and heating energy ratio?
7. What is Carnot principle and what are the corollaries of Second law?
8. What are the modifications required to obtain the maximum possible COP in any application?
9. What is the refrigeration temperature requirements of air conditioning in summer?
10. What is the refrigeration temperature requirements of Domestic refrigerators?
11. What is the refrigeration temperature requirements of Freeze drying and IQF(Instant Quick
Freezing)?
12. What is the meaning of “Air-cooled units” and “Water-cooled units”?
13. What is the ideal refrigeration cycle? Explain its components.
14. What are the various processes involved in the ideal refrigeration cycle?
15. What is the working fluid used in the ideal refrigeration cycle?
16. Can we use vapour as a refrigerant in the Ideal refrigeration cycle?
17. Plot the Reversed Carnot cycle in T-S and P-V diagram?
18. What are the drawbacks of using gas as refrigerant in Reversed Carnot cycle?
19. What is the meaning of the term exergetic efficiency?
20. On which cycle the conventional refrigeration systems work?
21. Tell me two heat operated refrigerating machines?
22. What is the low temperature refrigeration or cryogenic refrigeration cycle?
23. What is the main purpose of using cryogenic refrigeration cycle?
24. What is the recent development in the refrigeration?
25. Is it possible to attain absolute zero?
26. What is the name of the process by which absolute zero can be obtained?
27. Can we perform reversed Carnot cycle as a practical cycle?
28. What are the modifications required for using the Reversed Carnot cycle as practical cycle?
29. What do you understand by Dry compression and Wet compression?
30. What are the various components of VCRS?
31. Which type of compressor is used in VCRS?
32. Is evaporator or condenser a heat exchanger?
33. How do we carry out expansion process in VCRS?
34. Why do we prefer the isenthalpic expansion instead of isentropic expansion in case of VCRS?
35. What is the meaning of Condensing unit in VCRS?
36. Why do we need a compressor?
37. What is the meaning of high-pressure side and low-pressure side?
38. Represent the VCRS cycle in T-S and P-H graph.
39. What is liquid vapour regenerative heat exchanger?
40. What is need of superheating and subcooling in the system?
41. What is Degree of Subcooling and Degree of Superheat?
42. Draw the T-S diagram of Actual VCRS?
43. What is coil frosting and defrosting?
44. What is Superheat horn?
45. What is the reason of internal irreversibility in VCRS cycle?
46. Name some of the most common organic refrigerants that have been employed recently?
47. What role does the fluorine atom play in the molecules?
48. What role does the chlorine atom play in the molecules?
49. What role does the hydrogen atom play in the molecules?
50. How does the brominated refrigerants are denoted?
51. What is the difference between saturated and unsaturated compound?
52. How designation is done for these two compounds?
53. Which refrigerants were chosen to phase out by 2000?
54. Which refrigerants are chosen to be phase out by 2030?
55. What is the impact of using hfcs to the environment?
56. What are the favourable physical properties of the refrigerants?
57. What are the favourable chemical properties of the refrigerants?
58. Which refrigerant is highly soluble in water?
59. What is Raoult’s law of solubility?
60. What is meaning of Moisture choking?
61. What is the effect of supercharging in a refrigeration cycle?
62. How do we decide the condenser design pressure of refrigerator?
63. What are the different types of expansion devices used?
64. What kind of expansion device used in windows air conditioner?
65. What are the favourable and unfavourable factors of R-134a?
66. How temperature and work of compression is reduced in reciprocating cylinder?
67. What are the limitations of Carnot cycle with gas as a refrigerant?
68. What are the alternate names of Reversed Brayton?
69. What are the various process of Reversed Brayton cycle?
70. Show the schematic diagram of simple gas cycle?
71. On which parameters COP of gas refrigeration cycle depends?
72. How COP varies with the increase in pressure ratio?
73. Which cycle has more COP, VCRS or Gas refrigeration cycle?
74. What are the benefits of Closed cycle gas refrigeration cycle?
75. What is pure substance? Is moist air a pure substance?
76. What does Dalton’s law of partial pressure states?
77. How many properties are required to fix the state of dry air?
78. How many properties are required to fix the state of moist air?
79. Why water vapour behaves as a perfect gas in moist air?
80. What is dry bulb temperature?
81. What is wet bulb temperature?
82. What is dew point temperature?
83. On which parameter specific humidity depends upon?
84. What is specific humidity and what does it physically signifies?
85. What is saturated air?
86. What is unsaturated air?
87. How can we remove the water vapour from the humid air?
88. What is the meaning of relative humidity?
89. What does it mean when relative humidity of air becomes 100%?
90. What is the definition of humid specific heat?
91. By which instrument we can measure DBT and WBT?
92. What is adiabatic saturation process?
93. Up to which temperature range psychrometric chart is prepared?
94. Which psychrometric processes are performed in Summer AC?
95. Which psychrometric processes are performed in Winter AC?
96. Which psychrometric processes are performed in Desert Cooler?
97. What do you understand by Pure humidification and Dehumidification?
98. Why is it not possible to perform pure humidification and dehumidification process?
99. What is sensible heating and cooling?
100. What are the various lines plotted in psychrometric chart?