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Mechanic Refrigeration & Air Conditioning Practice Test: Direct Expansion Air Conditioning
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Mechanic Refrigeration & Air Conditioning Practice Test: Direct Expansion Air Conditioning
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25 Questions

1. What is the effect on system performance if the AC system is at undercharged condition?
2. Why the temperatures of inlet and outlet water in shell and tube condenser are recorded in log sheet?
3. What is the method of flushing the indoor coils?
4. What is the cause of oil foaming in compressor crankcase at the time of starting?
5. What is the reason for short cycling of LP control switch in AC plant?
6. How the indoor unit acts during heating cycle of heat pump?
7. Which distribution system is absent in VRV operation compared to central AC plant?
8. Which process is done to remove the oil and other impurities from the condenser tubes?
9. What is the purpose of evacuating the system before gas charging?
10. Which type of AC system is operated by VRV system?
11. What is the type of cooling system?
12. Which is circulated in VRV system for cooling cycle?
13. Which valve is first closed to start the pump down operation in central AC plant?
14. What is the expansion of HVAC?
15. Which type of AC system is capable of heating or cooling in different zones simultaneously?
16. What is the benefit of VRV system?
17. Which set of components are used in FCU?
18. Which compressor is used only in central AC systems?
19. Which refrigerant is used with VRF AC system?
20. What is the name of damper inside the duct?
21. Which valve is used to release the non condensable gases from AC plant?
22. Which parameters in log sheet indicate the air blocking in ducts?
23. Which tool is used for descaling the condenser tubes in shell and tube condenser?
24. What is the purpose of the screw marked as x in LP control?
25. What is the value of absolute vacuum in millimetres of mercury?

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