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

1. A good refrigerant should have

 
 
 
 

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

 
 
 
 

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

 
 
 
 

4. The freezing point of R-12 is

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

10. Reynolds number is the ratio of

 
 
 
 

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