REFRIGERATION AND AIRCONDITIONING
Objectives
1. Define: Refrigeration [1]
2. Define: Tonnage of Refrigeration [1]
3. Define COP of Refrigeration and give the equation for the same for VCR system
with proper notations [2]
4. Prove: 1 TR = 3.15 kJ/s [2]
5. Prove: (COP)
heat
pump
= 1+ (COP)
refrigerat
or
[2]
6. In a refrigerating machine, if the lower temperature is fixed, then the COP of the
machine can be increased by _____________ [1]
7. The COP of reversed Carnot Cycle most strongly depends on___________ [1]
8. The efficiency of a Carnot heat engine is 80%. The COP of refrigerator working
on reversed Carnot cycle is _____ [1]
9. The COP of reversed Carnot Refrigerator is 4. The ratio of its highest temperature
to lowest temperature is ______ [1]
10.
Air refrigeration cycle is used in _________ [1]
11.
In a refrigerating machine heat rejected is __________ than heat absorbed. [1]
12.
During refrigeration heat is rejected by the refrigerant in a __________ [1]
13.
In a VCR system the condition of the refrigerant before entering the condenser is
__________ [1]
14.
The highest temperature during the cycle in a VCR system occurs after
_________ [1]
15.
The lowest temperature during the cycle in a VCR system occurs after _________ [1]
16.
In a domestic refrigerator commonly used refrigerant is __________ [1]
17.
In a VAR system the compressor unit is replaced by ____, _____, and _____ [1]
18.
The COP of a practical VCR system is ________ as compared to VAR system [1]
19.
In aqua-ammonia and Li-Br water absorption refrigeration systems, the refrigerant
are respectively __________ and ___________ [1]
20.
In Li-Br water absorption refrigeration system ________ is used as refrigerant. [1]
21.
In aqua-ammonia absorption refrigeration system ________ is used as absorbent. [1]
22.
The refrigerant R-717 is_____________ [1]
23.
Chemical formula for R-12 is ______ [1]
24.
Dichloro-trifluoroethane is written as __________ [1]
25.
The refrigerant supplied to compressor must be_____________ [1]
26.
A condenser is used in the ____________ pressure side of a refrigerating system. [1]
27.
A evaporator is used in the ___________pressure side of a refrigerating system. [1]
28.
An evaporator is also known as______ [1]
29.
Capillary tube is an example of _________ [1]
30.
Throttling is an _________ process [1]
31.
In a refrigerating system expansion device is connected between ____ & _____ [1]
32.
In domestic refrigerator commonly used expansion device is _________ [1]
