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Refrigeration and Air Conditioning Practice Test: Simple Vapour Compression Refrigeration Systems
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Simple Vapour Compression Refrigeration Systems topics include: Simple VCR system mechanism, theoretical VCR with dry saturated vapour and superheated vapour after compression, actual VCR cycle, VCR system various parameters effect and pressure – enthalpy chart. A vapor compression refrigeration system (VCRS) is a closed system that uses mechanical energy to cool the surrounding air. VCRS systems are made up of four main components: Compressor: A mechanical device that increases the pressure of gaseous refrigerants by decreasing their volume Condenser: Changes the phase of the refrigerant... Show more
Refrigeration and Air Conditioning Practice Test: Simple Vapour Compression Refrigeration Systems
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25 Questions

1. Refrigerating effect corresponds to which of the following processes?
2. Effect of high side pressure or discharge pressure or condenser pressure is to reduce the COP of the cycle.
3. The COP of vapor compression when vapor is superheated after compression having refrigeration effect (Re) of 360 and work done (W) of 40 is?
4. Which of the following factor of the actual VCR affects severely the coefficient of performance?
5. Which of the following is not the difference between theoretical and actual VCR cycle?
6. The COP of the cycle may increase or decrease or remain unchanged depending upon the range of pressure and the degree of superheating.
7. What is the effect of using a flash chamber in VCR system?
8. The low pressure and temperature vapor refrigerant enters the ______ of the vapor compression system.
9. In any compression refrigeration system there are how many pressure conditions?
10. What is the effect of a decrease in suction pressure on C.O.P.?
11. The effect of liquid sub cooling is less pronounced in case of?
12. What is the COP of a theoretical VCR having an undercooling of 5° C. Use the following data.
Enthalpy H1 = 180.5,
Enthalpy H2 = 194.5,
Enthalpy Hf3′ = 45.5,
Specific heat at constant pressure for superheated liquid = 0.95KJ/kg K.
13. Which of the following is not an advantage of vapor compression cycle over reversed Carnot cycle?
14. What is the value of C.O.P. in the VCR with a flash chamber?
15. Due to what in wet-compression affects the heat transfer rates from the vapor refrigerant to the cooling medium?
16. In which case does the compression process remains in superheated state?
17. One of the assumptions of the vapor compression cycle is that all of the processes are reversible.
18. The COP of vapor compression refrigeration compared to simple air refrigeration system is ________
19. Which of the following is not an advantage of vapor compression refrigeration system over air refrigeration system?
20. The difference between the saturation temperature T3 of liquid refrigerant at pressure p3 = p2 and the actual temperature of liquid refrigerant T3′ is called?
21. After which process during the VCR cycle, the highest temperature is achieved?
22. The first vapor compression refrigeration system was developed by ________
23. The ultimate effect of undercooling is to increase the value of COP under same set of conditions.
24. What is the effect of an increase in discharge pressure on C.O.P.?
25. Superheating before compression increases the refrigeration effect.