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

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

 
 
 
 

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

 
 
 
 

3. The freezing point of R-12 is

 
 
 
 

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

 
 
 
 

5. Reynolds number is the ratio of

 
 
 
 

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

 
 
 
 

7. A good refrigerant should have

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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