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1. True or False: One reason why stoichiometric (imperfect) combustion is impossible is because the air in our environment isn't pure oxygen.
2. When you have too much air, ____________ is the greatest concern. When you have too little, ___________ is the greatest concern.
3. High-efficiency condensing furnaces should have ___________ draft pressure, and natural or induced draft furnaces should have _____________ draft pressure.
4. True or False: Combustion analyzers always measure CO2 by using a CO2 sensor built in.
5. What is the acceptable CO threshold for steady-state running conditions?
6. True or False: On high-efficiency condensing furnaces, you can test the flue gases externally (i.e., by placing the combustion analyzer probe into the outlet of the furnace's drainage assembly).
7. What is the maximum allowable concentration of CO for 24-hour exposure in ANY living space per ASHRAE?
8. Which of the following issues could cause a pressure switch to fail to close (not fail closed!)?
9. If you measure the draft and see that it is not within specs, which diagnostic possibility should you consider?
10. True or False: Cracked heat exchangers are often caused by actions done by homeowners and technicians, not just typical aging or environmental causes.
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