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Refrigeration Practice Test: Basic Refrigeration
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Avg score: 88% • Most missed: “Which one is not a limitation of the Carnot cycle with air or gas as refrigerant…”
Basic Refrigeration topics include: Rrefrigeration units and performance, open air refrigeration system, heat pump, air refrigerator working on reverse carnot and bell coleman cycle. The basic refrigeration cycle has four main processes: Compression: The compressor increases the pressure and temperature of refrigerant gas by decreasing its volume. Condensation: The condenser transfers heat from the refrigerant gas to an external cooling source, such as water or air. The condenser turns the vapor into liquid and absorbs some of the heat. Expansion: The refrigerant proceeds to the expansion... Show more
Refrigeration Practice Test: Basic Refrigeration
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25 Questions

1. The C.O.P for reverse Carnot refrigerator is 2. The ratio of highest temperature to lowest temperature will be _____
2. 1 Pascal = 1 _____
3. If a condenser and evaporator temperatures are 312 K and X K respectively, and C.O.P. is given as 5 then find the value of X.
4. What is the relation between Celsius and Fahrenheit scale?
5. If a condenser and evaporator temperatures are 312 K and 273 K respectively, then reverse Carnot C.O.P is _________
6. What are the temperature and pressure for N.T.P. (Normal Temperature Pressure)?
7. C.O.P. of the refrigerator is always __________ the C.O.P. of the heat pump when both are working between the same temperature limits.
8. Out of the following reasons which one is responsible for Carnot cycle not being used in practice?
9. A reversed Carnot cycle is operating between temperature limits of 272 K and (+) 49°C. If it acts as a heat engine gives an efficiency of 15.52%. What is the value of C.O.P. of a refrigerator operating under the same conditions?
10. Which one is not a limitation of the Carnot cycle with air or gas as refrigerant?
11. A heat pump which runs (1/3)rd of time removes on an average 2400 kJ/hr of heat. If power consumed is 0.25 kW, what is the value of the C.O.P.?
12. Why low temperature refrigeration is produced in an air standard refrigeration system?
13. Which is the S.I. unit to measure pressure in refrigeration?
14. C.O.P. of the heat pump is always _____
15. What is the C.O.P. of a refrigeration system if the work input is 40 KJ/kg and work output is 80 KJ/kg and refrigeration effect produced is 130 KJ/kg of refrigerant flowing.
16. If a condenser and evaporator temperatures are ‘X’ K and 100 K respectively, and reverse Carnot C.O.P is 2.5 then find out the ‘X’.
17. A reversed Carnot cycle is operating between temperature limits of (-) 33°C and (+) 27°C. If it acts as a heat engine gives an efficiency of 20%. What is the value of C.O.P. of a heat pump operating under the same conditions?
18. Find the C.O.P. of a refrigeration system if the work input is 40 KJ/kg and refrigeration effect produced is 130 KJ/kg of refrigerant flowing.
19. The Co-efficient of Performance is always __________
20. The C.O.P. of reverse Carnot cycle is most strongly dependent on which of the following?
21. What is absolute zero temperature?
22. A heat pump is used to maintain a hall at 30°C when the atmospheric temperature is 15°C. The heat loss from the hall is 1200 kJ/min. Calculate the power required to run the heat pump if its C.O.P. is 40% of the Carnot machine working between the same temperature limits.
23. What is the S.I. unit required to measure the work done in refrigeration is?
24. Reduction in operating pressure in the Air refrigeration cycle results in _________
25. For what condition, evaporative cooling system is ideal?

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