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Regular tune-ups of your heating system will cut heating costs and will most likely increase the lifetime and safety of the system. When a service technician performs a tune-up, he or she should test the efficiency of your heating system. The technician should measure the efficiency of your system both before and after servicing it and provide you with a copy of the results. Combustion efficiency is determined indirectly, based on some of the following tests: 1) temperature of the flue (or chimney); 2) percent carbon dioxide or percent oxygen in the atmosphere; 3) presence of carbon monoxide in the atmosphere; and 4) draft. Incomplete combustion of fuel is the main contributor to low efficiency. If the technician cannot raise the combustion efficiency up to at least 75% after tuning your heating system, you should consider installing a new system or at least modifying your present system to increase its efficiency.
(Adapted from Alex Wilson and John Morrill, Consumer Guide to Home Energy Savings. ©1993 by the American Council for an Energy-Efficient Economy.)
Now let's move on to the sample questions. You will not be able to revise or retake a quiz unless you start the module over. Go through all the sample passages before you start over. Your score is available throughout the practice or you can click the "SCORE" at the top of the page in the upper-right hand corner.
Created by Renee Wright for Triton College 2010.