Using the nominal 400 CFM per ton, how much airflow does a 3-ton air conditioner need?
Answer in CFM.
Show the answer
1200 CFM
Airflow = tons x 400 CFM per ton = 3 x 400 = 1,200 CFM.
Reference: Nominal airflow per ton of cooling
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HVAC / mechanical contractor practice test
160 free practice questions for this exam, each with the reason for the answer and where to look it up.
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HVAC fundamentals: practice test
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About the exam
| Exam | HVAC / mechanical contractor |
|---|---|
| Who runs it | State boards |
| Where | United States (varies by state) |
Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.
Sample questions
A heating element with a resistance of 12 ohms is connected to 240 V. How much current does it draw?
Answer in A.
Show the answer
20 A
I = E / R = 240 V / 12 ohms = 20 A.
Reference: Ohm's law
A furnace has 68°F return air and 125°F supply air. What is the temperature rise?
Answer in °F.
Show the answer
57 °F
Temperature rise = supply air temperature - return air temperature = 125°F - 68°F = 57°F.
Reference: Furnace temperature rise
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