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30 questions from the hvac fundamentals practice test.
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10 questions, graded as you go, with the reason for every answer. No sign-up.
An air conditioner delivers 36,000 Btu/h while drawing 3,000 W at the rating condition. What is its EER?
Answer in Btu/Wh.
12 Btu/Wh
EER = cooling output in Btu/h / power input in watts = 36,000 / 3,000 = 12.
Reference: Energy efficiency ratio
An air conditioner has an EER of 12. Using 3.412 Btu/h per watt, what is the equivalent COP? Answer to two decimal places.
Answer in COP.
3.52 COP
COP = EER / 3.412 = 12 / 3.412 = 3.52.
Reference: Converting EER to COP
A vacuum gauge reads 0.5 mm Hg (0.5 torr) absolute. What is that in microns?
Answer in microns.
500 microns
1 mm Hg = 1,000 microns, so 0.5 mm Hg x 1,000 = 500 microns.
Reference: Vacuum measurement units