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Oil Burner License Exam 2025 Questions and Answers What is the first thing a tech should do when arriving at a no combustion call? - -CORRECT ANSWER--Ask how many times the customer reset the unit. What is the best long term solution for preventing a clogged nozzle? - -CORRECT ANSWER---Remove any underground storage tanks. -Install a quality oil filter. -Cut the suction line 10" above the tank outlet to prevent sludge. Hot water and steam valves are interchangeable. - --CORRECT ANSWER--False When in the presence of a flame, a cad cell normally reads.. - --CORRECT ANSWER--300-1000 ohms If a pump is used to bring oil to a level higher than the tank, an oil safety valve is required. - --CORRECT ANSWER--True On a call where a hydronic heat system is putting out too much heat on the stack, the issue may be.. - --CORRECT ANSWER---Too much draft. -Not enough combustion air in the equipment room. ....COPYRIGHT ©️ 2025 ALL RIGHTS RESERVED...TRUSTED & VERIFIED 1