Mn Special Engineers Practice Exam

For the purpose of rating boiler horsepower for an Engineers licence only, how many square feet of boiler surface shall be equivalent to one boiler horsepower on a boiler? - Answer-10 Sq. Ft. Heating Surface What is meant by the term Low Pressure Boiler? - Answer-boilers operating at a steam or other vapor pressure of 15 psig. Or less, or a hot water or other liquid boiler in which the pressure does not exceed 160 psig. Or a temperature of 250 f°. A person holding a current state of Minnesota Special Engineers Licence could be in charge of or a shift engineer in what size plants(s)? - Answer-High and low pressure boiler not to exceed a total of 50 horsepower, or a shift engineer in a 100 Horsepower plant. Special Engineer may serve as apprentice of what size water/liquid or steam/vapor boiler? - Answer-In any plant regardless of size under the direct supervision of the properly licensed engineer. The purpose of the low water cut out on a steam-or hot water boiler is to what? - Answer-Shut off the burner when a low water condition exists. The valve or valves that must relive all excess pressure on a steam or hot water boiler are what? - Answer-Safety valve and/or an ASME approved safety relief valve. A Tri indicator could be found on a: - Answer-Steam boiler. A Tri indicator would inform the boiler operator of what? - Answer-The AMOUNT of water, the LEVEL of water, and if it is LOW on water. What is the destructive force in a steam or hot water boiler explosion? - Answer-The instant release of energy stored in the water as heat. An ASME approved safety relief valve used on a hot water boiler is tested at the factory on what? - Answer-Steam first then hot water. Some of the things you could find on a steam or hot water boiler are what? - Answer-Low water cut off, safety valve or safety relief valve, pressure gauge. What devices would only be found on a steam boiler? - Answer-Steam pressure gauge, tricocks, pressuretrols. An expansion tank or compression tank would be used whit a what? - Answer-Hot water boiler.