Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. The vapour compression refrigerator employs the following cycle

2. A reversible engine has ideal thermal efficiency of 30%. When it is used as a refrigerating machine with all other conditions unchanged, the coefficient of performance will be

3. The general rule for rating refrigeration systems (excepting for CO₂ system) is to approximate following h.p. per ton of refrigeration

4. Highest temperature encountered in refrigeration cycle should be

5. The change in evaporator temperature in a refrigeration cycle, as compared to change in condenser temperature, influences the value of C.O.P.

6. In a refrigeration system, the expansion device is connected between the

7. The freezing point of sulphur dioxide is

8. Most thermostatic expansion valves are set for a superheat of

9. If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

10. Freon group of refrigerants are


 

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