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

1. Reynolds number is the ratio of

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. The freezing point of R-12 is

 
 
 
 

5. A good refrigerant should have

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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