Minnesota Special Engineer Boiler License Practice Exam Questions and Answers | Updated 2024/2025 | Graded A+

For the purpose of rating boiler horsepower for an Engineers License 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 15psig or less, or a hot water or other liquid boiler in which the pressure does not exceed 160 psig or a temperature of 250 degrees F. A person holding a current State of Minnesota Special Engineers License could be in charge of, or a shift engineer in what size plant(s)? - ANSWER High and Low pressure boilers not to exceed a total of 50 boiler horsepower, or a shift engineer in a 100 horsepower plant. Special Engineer may serve as an apprentice of what size water/liquid or steam/vapor boiler? - ANSWER In any plant regardless of size under the direct supervision of a properly licensed engineer. The purpose of 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 relieve 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 Hot water boiler A tri indicator would inform the boiler operator of what? - ANSWER The TEMPERATURE of the water, the PRESSURE of the water in PSIG, and the ALTITUDE of water in feet. 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 relieve calve used on a hot water boiler is tested at the factory on what? - ANSWER Steam first then hot water. Minnesota Special Engineer Boiler License Practice Exam Questions and Answers | Updated 2024/2025 | Graded A+ Some of the things you could find on a steam boiler (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 in what? - ANSWER Hot water boiler What is the purpose of the expansion tank? - ANSWER To provide for expansion and contraction of the water volume as its temperature varies. On a hot water boiler, what is the purpose of the vent valve? - ANSWER To make sure there is water inside the boiler and to vent any trapped air. If the safety valve or ASME safety relief valve leaks you would do what? - ANSWER Have the valve repaired or replaced. Tri cocks or gauge cocks are sued on a steam boiler to indicate? - ANSWER The true water level inside the boiler. On a steam or hot water boiler, the safety valve or safety relief valve could be tested by? - ANSWER When the boiler is running lifting the lever on the valve or raising the pressure until they operate. Before starting a steam or hot water boiler you should check for what? - ANSWER Water in the boiler. True or False: Bottom blow down valves are used for both steam and hot water. - ANSWER True Safety valves or safety relief valves should be manually tested at least...? - ANSWER Monthly The low water cut out is one of the most important electrical/mechanical devices on your boiler. How often should you test it? - ANSWER Daily What device must be located between a hot water boiler and the expansion tank? - ANSWER A shut off valve so the expansion can be isolated and drained during operation of the boiler. On a hot water boiler, every time the burner operates the safety relief valve opens. Why? - ANSWER The expansion tank is water logged, or the isolating valve for the expansion tank is closed. An Aquastat is used on a...? - ANSWER Hot water boiler To reduce thermal shock on hot water boilers, what devices are used? - ANSWER Low limit or low fire hold control, three way valve, run around pump. On a steam boiler the control named operator will... - ANSWER On pressure decrease: Start. On pressure increase: Stop