Black Seal Test Study Guide | 230 Questions with 100% Correct Answers

Black Seal Test Study Guide | 230 Questions with 100% Correct Answers What does PSIA stand for? - Correct Answer Psig + atmospheric pressure Carryover can lead to: - Correct Answer Water Hammer Water column & gauge glass should be blown down: - Correct Answer Daily If water leaves the boiler at 170•, what temperature does it return at? - Correct Answer 150• What is the most common cause of cast iron boiler failure? - Correct Answer Cracking The positioning control cannot function without: - Correct Answer Air What is the most common of problems in a hot water system? - Correct Answer Air What fire tube is most efficient? - Correct Answer 4 Pass Where are the combustion gases on a serpentine boiler? - Correct Answer Below the tubes What is the purpose of a check valve? - Correct Answer To Prevent reverse flow & Allow flow in one direction A solenoid valve: - Correct Answer Is an automatic gas shutoff valve The most common type of pressure control device used is the: - Correct Answer Mercury Tube A steam gauge is calibrated in: - Correct Answer Lbs/Sq. Inch Heavy soot on the fireside of tubes: - Correct Answer Should be removed for better heat transfer