Download MN Boiler Exam Questions with 100% Correct Answers | Verified | Updated 2024 and more Exams Advanced Education in PDF only on Docsity! MN Boiler Exam Questions with 100% Correct Answers | Verified | Updated 2024 3 ways that heat transfers - Correct Answer-radiation, conduction, convection 3 types of drafts - Correct Answer-natural, forced, induced 3 types of boilers - Correct Answer-fire tube, water tube, cast iron sectional Fire tube boiler - Correct Answer-hot gases circulating through tubes surrounded by water Water tube boiler - Correct Answer-hot gases circulating around tubes filled with water Cast iron sectional boiler - Correct Answer-made of individual sections, is expandable pg. 1 professoraxe l Low pressure boiler defined - Correct Answer-<15psig steam, <160psig hot water or <250 degrees What to do if no water is visible in boiler - Correct Answer- shut down and allow to cool, DO NOT ADD WATER Boiler explosion - Correct Answer-destructive force caused by instant release of energy stored as heat Efficiency - Correct Answer-output divided by input Insufficient draft - Correct Answer-lowers efficiency One horsepower (HP) is equal to - Correct Answer-10 sq. ft. of heating surface One kilowatt (KW) is equal to - Correct Answer-one sq. ft. of heating surface Ten kilowatt (KW) is equal to - Correct Answer-one boiler horsepower pg. 2 professoraxe l Expansion tank - Correct Answer-hot water boilers only, allows for expansion and contraction of water volume with change in temperatures Vent valve - Correct Answer-hot water boilers only, to make sure there is water inside of the boiler and vent trapped air Shut off valve - Correct Answer-hot water boilers only, between boiler and expansion tank, so tall can be isolated during service Air control - Correct Answer-hot water boilers only, device designed to remove air from system Hot water boiler operation - Correct Answer-operates between 10-15 psi on temperature decrease- start, on temp. increase- stop Steam boiler - Correct Answer-A closed pressure vessel in which water is converted to steam by the application of heat pg. 5 professoraxe l Steam boiler operation - Correct Answer-operates at 15 psi pressure decrease- start, on pressure increase, stop Water column - Correct Answer-steam boilers only, reduces fluctuation of water to get accurate water level reading, blow down daily Gauge glass - Correct Answer-steam boilers only, sight glass showing water level, blow down daily Blowing down water column - Correct Answer-steam boilers only, gauge should refill with water quickly Tricocks - Correct Answer-Steam boilers only, Shows true water level inside steam boiler, 2 methods of determining water lvl, test daily Tricocks - Correct Answer-Middle of tricock on NOWL, top will bleed steam bottom bleeds water Pressuretrol - Correct Answer-Steam boilers only, Turns the burner on and off, middle of tricock on NOWL pg. 6 professoraxe l Pressuretrol - Correct Answer- pg. 7 professoraxe l
