Black Seal Exam Questions and Answers 2025

Black Seal Exam Questions and Answers 2025 What does PSIA stand for? - answer-Psig + atmospheric pressure Carryover can lead to: - answer-Water Hammer Water column & gauge glass should be blown down: - answer-Daily If water leaves the boiler at 170•, what temperature does it return at? - answer-150• What is the most common cause of cast iron boiler failure? - answer-Cracking The positioning control cannot function without: - answer-Air What is the most common of problems in a hot water system? - answer-Air What fire tube is most efficient? - answer-4 Pass Where are the combustion gases on a serpentine boiler? - answer-Below the tubes What is the purpose of a check valve? - answer-To Prevent reverse flow & Allow flow in one direction A solenoid valve: - answer-Is an automatic gas shutoff valve The most common type of pressure control device used is the: - answer-Mercury Tube A steam gauge is calibrated in: - answer-Lbs/Sq. Inch Heavy soot on the fireside of tubes: - answer-Should be removed for better heat transfer What code is a heating boiler built to: - answer-ASME Section IV(4) When connecting a Bourdon tube steam gauge to a boiler, a pigtail is used to: - answer Protect Bourdon tube from steam