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

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

 
 
 
 

2. A good refrigerant should have

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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

 
 
 
 

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 radiation emitted by a black body is known as

 
 
 
 

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

 
 
 
 

9. The freezing point of R-12 is

 
 
 
 

10. Reynolds number is the ratio of

 
 
 
 

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