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Mechanic Refrigeration & Air Conditioning Practice Test: Chiller System
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Mechanic Refrigeration & Air Conditioning Practice Test: Central Air Conditioning

Mechanic Refrigeration & Air Conditioning Practice Test: Chiller System
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25 Questions

1. Which psychrometric processes are represented between initial (t1) and final (t2) conditions of air in the chart?
2. Which secondary refrigerant is used for human comfort in chiller plant AC?
3. What is the advantage of electrically interlocked circuit for motors and pumps in a chiller plant?
4. Which parameter indicates that the central AC system has non condensable gas?
5. What is the pH level of water used for final rinsing of condenser tubes after descaling?
6. What is the purpose of valves in chiller AC plants?
7. Which type of heat is considered for tube light s heat gain in AC space?
8. What is the cause of bubbles in liquid line sight glass after gas charging the system?
9. Which valve is used in capacity control system employing hot gas bypass?
10. How the pH of water is checked for acidic or alkaline?
11. Which component protects the electrical circuit and loads from excess current?
12. What is the advantage of air washer compared to cooling coil of AHU?
13. What is the effect of improper alignment of machines while installing a central AC plant?
14. What is the name of component used in air distribution system?
15. What is the effect if the refrigeration system is started before chilled water pump?
16. Which tool is used to straighten the deformed fins of air cooled condenser?
17. What is the remedy for no lubrication even if the sight glass shows proper oil level?
18. What parameters are checked if the uneven cooling prevails at different rooms in a chiller plant?
19. Which process is indicated between 1 and 2 by the arrow mark at constant dry bulb temperature?
20. What is the effect if the oil return from oil separator to the compressor is blocked?
21. Which type of expansion device is used in flooded chillers?
22. What is the advantage of variable speed pumping load control in chiller AC plant?
23. Which causes the filter drier to become cold in chiller AC plant?
24. What is the cause of compressor knocking sound in chiller AC plant?
25. What is the formula for finding cooling tower efficiency?

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