Hvac 108 Exam Questions With 100% Correct Answers

The primary control starts burner operation in response to a signal from​ the_____. - ANSWER-room thermostat When replacing an oil burner​ nozzle, always use​ a(n)_____. - ANSWER-nozzle wrench When doing a smoke spot test on a heavy​ boiler, an acceptable smoke spot number​ is_____. - ANSWER-two When reviewing the results of a combustion efficiency test for a furnace with a flame retention​ burner, the oxygen level should be​ _____. - ANSWER-3 to 5 percent In the presence of a burner​ flame, the resistance of the cad cell should​ be_____. - ANSWER-300 to​ 1,000 ohms Which of the following problems is not caused by a faulty​ nozzle? - ANSWER-Burner short cycling Which of the following problems does not cause odors around an oil​ burner? - ANSWER-A lined chimney The purpose of an electronic time delay used with an oil burner primary control is to​ _____. - ANSWER-allow the burner motor time to establish a draft