Heat Transfer, Refrigeration and Air Conditioning Online Test – Multiple Choice Questions and Answers

1. The freezing point of R-12 is


2. The ratio of Nusselt number and the product of Reynold’s number and Prandtl number is equal to


3. Thermal conductivity of a material may be defined as the


4. The alignment circle is marked on the psychrometric chart at


5. A good refrigerant should have


6. Reynolds number is the ratio of


7. The condition of refrigerant after passing through the expansion or throttle valve, in a vapour compression system is


8. The radiation emitted by a black body is known as


9. The index which corelates the combined effects of air temperature, relative humidity and air velocity on the human body, is known as


10. The capillary tube is not used in large capacity refrigeration systems because


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