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HVAC Practice Test
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HVAC Practice Test
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25 Questions

1. When one rises into the atmosphere, the atmospheric pressure decreases by 1 psi for every_________________.
2. An thermal expansion valve that is stuck wide open will cause ___________.
3. What device controls the supplementary electric heat according to the outdoor temperature?
4. Atmospheric pressure, at sea level, is 14.7 psia.
5. What is the minimum clearance for access panels on an outdoor condensing unit?
6. Pressure is usually measured in ___________.
7. The exertion of pressure on a substance with a constant temperature increases its volume in proportion to the increase in pressure.
8. Which of the following is a law of thermodynamics:
9. In a sealed system, pressure and temperature _________________.
10. Vaporization can be increased by _____________ the pressure on a liquid.
11. A compressor is operating with a discharge pressure of 235.3 psig and a suction pressure of 35.3 psig. What is the compression ratio (pumping ratio)?
12. Which of the following is not a type of compressor?
13. In Fahrenheit, the boiling point of water is _____________.
14. What is energy management?
15. What is the primary composition of natural gas?
16. What is heat, which causes a change in the state of a material without a change in temperature, called?
17. What is the major difference between a heat pump and an air conditioner?
18. An oversized heating and cooling system can cause which of the following?
19. Every mechanical refrigeration system has __________ different pressure levels.
20. What is a sling psychrometer used to measure?
21. What is the amount of heat energy required to evaporate 1 pound of water?
22. Sensible heat describes _________________________.
23. One BTU is the amount of heat required to raise the temperature of:
24. To change Fahrenheit to Celsius, which formula is used?
25. When the temperatures of a structure both inside and outside are equal, there is _____.

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