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Mechanic Refrigeration & Air Conditioning Practice Test: HVAC Plant
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Mechanic Refrigeration & Air Conditioning Practice Test: HVAC Plant
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25 Questions

1. Why the crankcase heater is energised for compressor during the shut down period of AC plant?
2. What is measured by the manometer in duct air?
3. What is the wet bulb temperature of air if dry bulb temperature is 35°C and wet bulb depression is 4°C?
4. Which parameter of air is measured by the thermometer bulb that is wetted in sling psychrometer?
5. Which parameter of power supply determines the speed of induction motor?
6. How the reciprocal of air density is mentioned in psychrometric chart?
7. Which temperature is measured first in sling psychrometer after whirling?
8. What is the dew point depression of air if dry bulb and dew point temperatures are 36°C and 32°C respectively?
9. Which instrument is used to measure the velocity pressure of air in ducting system?
10. What is the name of part marked as x in belt driven type fan?
11. What is the composition of oxygen in atmospheric air
12. Which process increases the specific humidity of air at constant dry bulb temperature?
13. How the space between the false ceiling and the building main ceiling is used in handling of air in central AC plant?
14. Which process decreases the dry bulb temperature of air at constant specific humidity?
15. What is the expansion of ADP?
16. Which psychrometer uses battery operated small fan?
17. Which system maintains indoor air quality by adding fresh air and conditioned air to offset heating or cooling loads?
18. What is the minimum quantity of fresh air needed per person in comfort AC?
19. Which is expressed in the scale marked along X?
20. Which type of load consumes more energy in an AC plant system?
21. Which design data is used for indoor air summer air conditioning?
22. Why the AHU outlet is connected to supply duct with canvas material?
23. Why the capacitor is tested inside a box or case?
24. Which fan is used to handle the direction of air flow 90° away from the inlet?
25. What is the name of part marked as x in a fan motor?

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