Refrigeration & Air-Conditioning Practice Set-3

May 18, 2021

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1. On the pressure-enthalpy diagram, condensation and desuperheating is represented by a horizontal line because the process

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 freezing point of sulphur dioxide is

4. The C.O.P. of a refrigerator working on a reversed Carnot cycle is (where T₁ = Lowest absolute temperature, and T₂ = Highest absolute temperature)

5. The minimum temperature to which water can be cooled in a cooling tower is

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

7. Which of the following cycles uses air as the refrigerant?

8. The condition of refrigerant after passing through the condenser in a vapour compression system is

9. The atmospheric air at dry bulb temperature of 15°C enters a heating coil maintained at 40°C. The air leaves the heating coil at 25°C. The bypass factor of the heating coil is

10. When the temperature of the surrounding is higher than the temperature of the body, then the heat loss by convection from the body to the surrounding will be


 

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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