MN Boiler License Exam Questions With 100% Correct Answers 2024, Exams of Advanced Education

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MN Boiler License Exam Questions With 100% Correct Answers 2024 What is the maximum boiler horsepower you may take charge of on a chief engineer's license? - Correct Answer-Unlimited A 1st class engineer may take charge of a boiler plant not to exceed - Correct Answer-500 Boiler HorsePower If you were to fail a chief engineer's exam, how long must you wait before you would be allowed to take the test again - Correct Answer-30 Days What should be displayed in the boiler room? - Correct Answer-Engineer's License and Exemption or inspection certificates A 2nd class engineer may take complete charge of a boiler plant not to exceed...? - Correct Answer-100 Boiler Horse Power pg. 1 professoraxe l T/F When determining what engineers license will be needed, the total horsepower connected to the common header is used - Correct Answer-True In a boiler plant where there are two 250 horsepower boilers using heating surface connected to the same common header, what engineer's license would be required? - Correct Answer- 1st Class Engineer What shift engineer's license would be required for two 250 HP boilers using heating surface connected to the same common header - Correct Answer-1st Class T/F A special engineer license is for high or low pressure boilers not to exceed 50 boiler HP - Correct Answer-True To whom would you report a boiler condition you thought not safe - Correct Answer-Boiler Inspector What grade license must the shift operator have where a chief engineer has charge of a plant of 500 BHP? - Correct Answer- 2nd Class pg. 2 professoraxe l be in charge of this plant? (temp of hot water is less than 250 F and pressure is less than 160 psi) - Correct Answer-Chief A, B, or C license What class and grade of license MUST the shift engineer have where a chief engineer has charge of a hot water plant operating below 250 F and 160 psig total bhp of 500 - Correct Answer-A 2nd Class Grade A, B, or C license For the purpose of the rating bhp for engineer's license classification only, how many sq ft of heating surface shall be equivalent to one bhp - Correct Answer-10 sq ft of heating surface What is meant by the term Low Pressure Boiler - Correct Answer-Boilers operating at a steam or other vapor pressure of 15 psig lr less; or a water or other liquid boiler in which the pressure does not exceed 160 psig or a temperature of 250 F A special engineer may serve as an apprentice in what size maximum vapor boiler plant - Correct Answer-In any plant under the direct supervision of the properly licensed engineer pg. 5 professoraxe l Under the new boiler license law, which became effective April 15, 1982; who would be allowed to fill out an affidavit for a person applying for a 2nd class, or higher, boiler license - Correct Answer-The employer of a 2nd class engineer A special engineer could be a shift engineer in a plant of not more than - Correct Answer-100 bhp A first class, grade B engineer could take charge of and be responsible for the safe operation and maintenance of boilers of not more than how many bhp - Correct Answer-500 bhp What does NBIC stand for? - Correct Answer-National Board Inspection Code What is the definition of Operation? - Correct Answer-on site act of manipulating, monitoring, and testing of boilers and their appurtenances by a properly licensed engineer or an apprentice under the direct supervision of the properly licensed engineer pg. 6 professoraxe l What does remote monitoring mean? - Correct Answer-act of viewing or overseeing the boiler or plant operating parameters or conditions from a remote location What does repair mean? - Correct Answer-work necessary to restore a boiler or pressure vessel to a safe and satisfactory working condition What is the definition of a state boiler inspector? - Correct Answer-national board commissioned boiler inspector current chief grade A license What does boiler horsepower mean? - Correct Answer-The amount of heat the boiler is capable of producing. There are several ways to describe bhp 1 bhp= 10 sq ft of heating surface for conventional boilers = 5 sq ft for steam coil generators = 10 KW for electric = 33,478 btu per hour of output = 34.5 lbs of water evaporated per hour from 212 F = 67,000 BTU input on hot water boilers when there is no sq ft data available pg. 7 professoraxe l Safety relief valves should be tested by hand at least - Correct Answer-Monthly On a hot water boiler the safety relief valves could be tested by - Correct Answer-lifting the lever on the valve or by raising the pressure until they operate T/F Bottom blowdown valves are provided for both steam and hot water boilers - Correct Answer-True What device must be located between the hot water boiler and the expansion tank - Correct Answer-A shut off valve so that the expansion tank can be isolated and drained during operation of the boiler On a hot water boiler, every time the burner operates the safety relief opens. Why? - Correct Answer-The expansion tank is water logged What is one reason for causing an expansion tank to fill with water - Correct Answer-Air leaks out of the gauge glass fittings An aquastat is used on a - Correct Answer-Hot water boiler pg. 10 professoraxe l Can low water occur in a hot water boiler - Correct Answer- Yes What would you do if you came into the boiler room and found no water in the boiler regardless if it's steam or hot water - Correct Answer-Shut off the burner and allow the boiler to cool The most dangerous action the boiler operator can take when water cannot be found in the boiler is to - Correct Answer-Add water to the boiler The low cut out is one of the most important electrical/mechanical devices on a boiler. Test it - Correct Answer-monthly All low water cutouts should be taken apart, cleaned and inspected - Correct Answer-Once a year What is the destructive force in a steam or hot water boiler explosion - Correct Answer-The instant release of energy stored in the water as heat pg. 11 professoraxe l On a hot water boiler, the control called the operator will - Correct Answer-On a temperature decrease- start the boiler; on a temperature increase- stop the boiler A hot water boiler is considered high pressure when - Correct Answer-Pressure is over 160 psi or temperature is over 250 F The pressure in a hot water system is maintained by - Correct Answer-adding or removing water Assuming all components in hydronic system is working, what would be the main reason for no heat - Correct Answer-Air in the system A BTU is the amount of heat required - Correct Answer-To raise one pound of water one degree F The heat that is necessary to convert water at 212 F into steam at 212 F is called - Correct Answer-Latent heat of vaporization pg. 12 professoraxe l Why would you want the superheater safety valve to release or "pop" before the main safety valve - Correct Answer-To maintain a steam flow through the superheater What is meant by superheated steam - Correct Answer-Steam which has been heated above the temperature corresponding to its pressure When operating a boiler plant, which must come first - Correct Answer-safety Steam traps may be checked for proper operation by - Correct Answer-Using a temperature stick An economizer is a heat-exchanger located in the - Correct Answer-Gas passage between the boiler and the stack What is the purpose of a boiler feed water regulator - Correct Answer-To control water level in the boiler pg. 15 professoraxe l On a boiler feed pump, which pipe should be the larger - Correct Answer-Suction pipe A low water cut out is installed on a mechanically fired steam boiler to - Correct Answer-Stop firing in event of low water When two stop valves are used on a boiler, it is best practice to have one - Correct Answer-An automatic non-return valve How many degrees F will one BTU raise the temperature of one pound of water - Correct Answer-1 degree When an open feedwater heater is in operation, the steam and water are - Correct Answer-In direct contact with each other How should a globe valve used in a boiler feed line be placed with respect to the pressure from the pump - Correct Answer- Pressure under the disc How can vaporization of the feed water from an open feed water heater to the pump be eliminated - Correct Answer- pg. 16 professoraxe l Increase the suction head by either raising the feed water heater or lowering the pump When priming a centrifugal pump, it is best to have the impeller - Correct Answer-Full speed What is the purpose of deaerating feed water - Correct Answer-Removes air and gas When steam contains small particles of water held in suspension it is referred to as - Correct Answer-Wet saturated steam What can be done to start water delivery on a steam-bound boiler feed pump - Correct Answer-Cool the pump What advantage would there be to using a vapor other than steam - Correct Answer-dryer T/F A (RPZ) reduced pressure zone or back flow preventer prevents contaminated water from entering the domestic water supply - Correct Answer-true pg. 17 professoraxe l Oxygen in a boiler's water can cause - Correct Answer- corrosion In a steam boiler system, the unit that turns the burner on and off based on steam pressure is the - Correct Answer-Pressure control If water in the gauge glass is not visible because of failure of the feed water supply, what should be done - Correct Answer- Shut off the fuel to the burner and secure the boiler What two scales does a pressure control have - Correct Answer-What two scales does a pressure control have What is the minimum size drain required on a water column - Correct Answer-¾ inch What is the minimum size bottom blow down line used on a mini or miniature boiler - Correct Answer-¾ inch What conditions are necessary to cause a furnace explosion - Correct Answer-Accumulation of unburned fuel, oxygen and ignition source pg. 20 professoraxe l The low water cut-out on a steam boiler should be tested - Correct Answer-monthly Can a high-pressure safety valve be used on the same boiler for low pressure - Correct Answer-Cannot be used Gauge pressure plus 14.7 psi is called what - Correct Answer- Absolute pressure The unit that shuts off the burner in the event of low water is - Correct Answer-Low water fuel-cut-out The evaporation of 34.5 lbs of water per hour from and at a temperature of 212 F is defined as what - Correct Answer-One bhp When a safety valve opens and closes rapidly it is referred to as - Correct Answer-chattering pg. 21 professoraxe l Furnace explosions are caused by a build up of combustible gases, or vapors in the combustion chamber, what is the term used to remedy this condition - Correct Answer-purging In order for a fuel to burn it must be heated to - Correct Answer-It's ignition temperature Why is a pigtail or siphon required in steam pressure gauge lines - Correct Answer-To protect the gauge from a high temperature In a steam boiler system, what is the term used for replacing the water that has been lost by blowing down the boiler or through leaks in the system - Correct Answer-Make up water On a steam boiler system, why are bottom blow down valves installed at the lowest point of the waterside of boilers - Correct Answer-To remove sludge and sediment Heating surface is defined as what - Correct Answer-Water on one side, hot gases on the other side pg. 22 professoraxe l Boilers are considered low pressure when - Correct Answer- Steam boilers are not over 15 psi and liquid boilers are not over 160 psi and 250 F What boiler license is required for operating boilers as a shift engineer in a plant having three boilers each having 1200 sq ft of heating space - Correct Answer-Second class A boiler weighs 1000 lbs empty, filling the boiler with water to its normal operating level requires 500 gal. What is the total weight of the boiler and water - Correct Answer-5165 lbs What type of valve is permitted for a shut-off on a steam gauge - Correct Answer-A tee or lever handle valve What is a draft gauge called - Correct Answer-manometer What is the minimum size of pipe used to attach a steam gauge to a steam boiler - Correct Answer-¼ inch How many ways can heat be transferred - Correct Answer-3 convection, conduction, radiation pg. 25 professoraxe l When adding water to a hot water heating system, if the pointer on the pressure gauge rises quickly it is an indication of - Correct Answer-A waterlogged expansion tank The maximum temperature to be carried on a low pressure hot water boiler is - Correct Answer-Less than 250 F The popping pressure of a safety relief valve on a low pressure hot water heating boiler cannot exceed - Correct Answer-160 psi The bottom blowdown line on a steam boiler system is located at the - Correct Answer-Lowest point of the waterside of a steam boiler How can you tell the maximum allowable working pressure on any boiler - Correct Answer-Look at the setting of the safety valve or safety relief vlave For the purpose of rating boiler hp for engineers license classifications only, how many sq ft of heating surface shall be pg. 26 professoraxe l considered equivalent to one bhp for conventional boilers - Correct Answer-10 sq ft In a hot water boiler system, what valve is installed to reduce incoming "city" water pressure to the hot water boiler operating pressure - Correct Answer-Pressure reducing valve What devices could be found in a hot water boiler heating system - Correct Answer-Safety relief valve Temperature-pressure gauge Pressure gauge Aquastat Expansion or compression tank If you fail a State of Mn Boiler Operator's License exam, how long must you wait before you can retake it - Correct Answer- 30 days What is a boiler called that furnishes hot water to be used externally to itself - Correct Answer-A hot water supply boiler pg. 27 professoraxe l If a condensate pump becomes steam bound and stops delivering water, what could be done to correct the problem - Correct Answer-Cool the pump by pouring water on it On a steam boiler, what is the unit called that is used to reduce the amount of movement of the water so the boiler operator can get an accurate reading of the water level in the gauge glass - Correct Answer-Water column After repair work is done on the boiler a test is used to check for leaks, what kind of test is used - Correct Answer- Hydrostatic test The minimum reading on a dial of a pressure gauge used on a low pressure boiler should be graduated - Correct Answer-One and a half to two times the MAWP The three basic types of low-pressure boilers are - Correct Answer-Fire tube Water tube Cast iron sectional pg. 30 professoraxe l If idle boilers are left filled with water, what precaution should be taken to prevent corrosion and oxygen pitting - Correct Answer-Keep the boiler water properly chemically treated The term used for the evaporative capacity output of a steam boiler is expressed in - Correct Answer-Pounds per hour The term used when small particles of water are carried over into the steam lines is called - Correct Answer-Priming What boiler license is required to be in charge of a boiler plant having two boilers, each having 1600 sq ft of heating surface - Correct Answer-1st Class how large of a boiler they can be in charge of- special engineer, 2nd Class, 1st Class and Chief - Correct Answer- 50BHP- 100BHP-500BHP-Unlimited When testing the low water fuel-cutoff on a steam boiler, the burner should be firing. why? - Correct Answer-To see if the burner shuts off pg. 31 professoraxe l How often should safety valves be tested by hand on a low pressure boiler - Correct Answer-Monthly What is the term used when a safety valve pops open when the pressure exceeds the MAWP and stays open until a sufficient amount of steam is released and there is a definite drop in pressure inside the boiler - Correct Answer- blowdown/blowback What is the minimum size pipe that is used to connect the water column to the boiler - Correct Answer-1 inch The most important safety device on a steam or liquid boiler is what - Correct Answer-The safety or safety relief valve Where is the breeching box located at for a steam or hot water boiler - Correct Answer-Between the boiler and the chimney What license is required for operating boilers as a shift engineer in a plant having three boilers with heating surfaces of 500 sq ft, 500 sq ft and 1000 sq ft - Correct Answer-2nd Class pg. 32 professoraxe l IAW the statutes of the State of Mn, each electric Bhp is equal to __ KW - Correct Answer-10 A logbook must be maintained in the boiler room by the __ - Correct Answer-Chief Engineer or the operating engineer designee The shift engineer of a high pressure boiler plant of over 200 hp must stay within __ of the boiler room at all times during the shift - Correct Answer-500 ft A high pressure boiler must have two means of feedwater supply if it exceeds __ hp - Correct Answer-50 When used, a quick-opening blowdown valve must be located - Correct Answer-nearest the boiler The minimum passing score for a Mn engineer's license exam is __ % - Correct Answer-70 pg. 35 professoraxe l Licenses granted must be displayed in - Correct Answer-A conspicuous place in the engine or boiler room For the purpose of the boiler and pressure vessels statutes, "a year" is considered to be at least __ hrs - Correct Answer-2000 Sensible heat is - Correct Answer-Able to cause a change in temperature Heat that brings about a change of state without causing a change in temperature is - Correct Answer-Called latent heat In a boiler, heat is transferred from the burning fuel to the water by - Correct Answer-Convection, conduction, radiation Convection is a method of heat transfer where the movement of the fluids is due solely to the - Correct Answer-Flow of fluids Large high pressure utility boilers use - Correct Answer- Balanced draft pg. 36 professoraxe l When heat transfer occurs by travelling through metal, it is known as - Correct Answer-conduction An example of the transfer of heat by radiation is - Correct Answer-The heating effect of the sun on the earth The document governing boiler fittings and valves is the__ code - Correct Answer-ASME (American Society of Mechanical Engineers) The best method of testing a low-water fuel cutoff (LWCO) is to - Correct Answer-Lower the water level in the boiler to the level where the burner should cut out Rules governing the construction of power boilers are set out in - Correct Answer-ASME Code Section I A way to determine if a safety valve on a boiler has sufficient capacity is to - Correct Answer-Check with the ASME Code An example of a non destructive test on a boiler is a __ test - Correct Answer-tensile pg. 37 professoraxe l