HVACR (Refrigeration & Air Conditioning) Mock Test - 1

1. What is the pressure side of a refrigerating system in which condenser is used?

2. What is the value of relative humidity if pv = 0.468 bar and ps = 0.893 bar?

3. What is the purpose of using intercooler?

4. What is the effect of an increase in discharge pressure on C.O.P.?

5. What is the value of optimum intermediate pressure is the cooling ratio is fixed in a compound VCR with intercooling having suction and discharge pressure as 2 and 8 bar respectively?

6. The COP of vapor compression when vapor is superheated after compression having refrigeration effect (Re) of 360 and work done (W) of 40 is?

7. What is S.I. unit of refrigeration?

8. Vegetables, Fruits, Frozen products can be maintained at the same temperatures and humidity.

9. Make-up water is used to keep the water level constant.

10. What is the relation between DBT and WBT if the relative humidity is 100%?

11. What is the By-pass factor for heating coil, if td1 = 19�C, td2 = 25�C and td3 = 37�C?

12. What is the purpose of using liquid sub-cooler?

13. What is the pressure at the outlet of a refrigerant compressor?

14. A vapor compression refrigeration system is an improved type of air refrigeration system in which a suitable working substance, termed as refrigerant is used.

15. Which of the following has the highest thermal conductivity at the vapour temperature of 0�C?

16. What is the key difference between a simple VAR and Electrolux refrigerator?

17. For the systems working on reversed Carnot cycle, what is the relation between C.O.P. of Refrigerator i.e. (C.O.P.)R and Heat Pump i.e. (C.O.P)P?

18. The coefficient of performance of a vapour compression refrigeration system is quite high as compared to the air refrigeration system.

19. Which properties are essential for thermoelectric refrigeration?

20. The simple air cooling system is good for _____ flight speed.