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MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what are the conditions necessary for good combustion? a) low sulfur content b) Thermal, thermocouple, tubular c) turbulence, temperature, time 3T's - correct answer ✅c) turbulence, temperature, time 3T's why is secondary air necessary in hand fired boilers? a) Necessary to burn the combustible gases b) if primary air should fail c) used only if sulfur content is high - correct answer ✅a) Necessary to burn the combustible gases when pressure increases on steam from a given amount of water what happens to its volume and latent heat? a) increases b) decreases c) remains the same - correct answer ✅b) decreases MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ when pressure increases on steam from a given amount of water what happens to its temperature? a) increases b) decreases c) remains the same - correct answer ✅a) increases when carbon monoxide (co) is formed and carbon dioxide (co2) is very high what does it generally signify? a) More "under the fire air" is needed b) less "under the fire air" is required c) more "over the fire" air is needed d) less "over the fire" is needed less - correct answer ✅c) more "over the fire" air is needed excess air is an expression that refers to: a) overabundance of air b) theoretical amount of air MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ the total heat of steam is 1,188 BTUs, and feed water temperature is 182 degrees Fahrenheit. What is the factor of evaporation? a) 107 b) 10.7 c) 1.07 - correct answer ✅c) 1.07 why would viscosity be important in fuel oil? a) more heat is recovered in water b) has more volatile hydrocarbons c) affects ease with which it can be handled - correct answer ✅c) effects ease with which it can be handled why is too much air objectionable? a) Cost too high b) loss of efficiency c) corrosive effect - correct answer ✅b) loss of efficiency MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what is a fyrite used for? a) flue gas analyzer b) combustion programmer c) water analysis - correct answer ✅a) flue gas analyzer absolute pressure is (ABS): a) atmospheric pressure - gauge pressure b) gauge pressure minus atmospheric pressure c) atmospheric pressure + gauge pressure - correct answer ✅c) atmospheric pressure + gauge pressure when pressure of steam increases, what happens to the temperature? a) Goes up b) goes down c) remains the same - correct answer ✅a) Goes up find the square feet of heating surface of a flu 4" in diameter and 20' in length: MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) 25'sq b) 251.32'sq c) 2513'sq d) 20.93'sq - correct answer ✅d) 20.93'sq what is the minimum size of the pipes connecting the boiler to the water column? a) 3/4 inch b) 1 inch c) 1/2 inch - correct answer ✅a) 3/4 inch why are crosses used instead of ells on water column connections? a) Cost less b) has more strength c) line may be easily cleaned - correct answer ✅c) line may be easily cleaned can you have valves between boiler and water column? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) control solids in the water of boiler c) control water level in a boiler - correct answer ✅c) control water level in a boiler when two stop valves are used on a steam outlet line, it is good practice to have one valve : a) slow opening b) automatic non-return c) quick opening - correct answer ✅b) automatic non-return is the valve stem connected to the disc on an automatic non-return valve? a) no b) yes c) only when open - correct answer ✅a) no what must you have between two stop valves on the steam outlet and between the header line? a) thermocoupler MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) dial actuated thermostat c) drain - correct answer ✅c) drain on a globe valve used on feed piping, the inlet shall be: a) immaterial b) above the valve disc c) under the valve disc - correct answer ✅c) under the valve disc which valve offers very little resistance to a flow? a) gate b) globe c) check - correct answer ✅a) gate which valve is used where a flow in one direction only is desired? a) gate b) globe c) check - correct answer ✅c) check MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ each boiler shall have: a) only one safety valve b) two safety valves c) one or more safety valves d) two or more safety valves - correct answer ✅c) one or more safety valves a boiler with more than 500 square feet of heating surface must have: a) one safety valve b) two or more safety valves c) three safety valves d) four safety valves - correct answer ✅b) two or more safety valves if a boiler is fired to full capacity, the header valve being closed, the safety valves or valve should prevent steam pressure from rising above: a) 4% above S.W.P. or valve setting b) 5% above S.W.P. or valve setting MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) under 15 psi - correct answer ✅b) never if it is desirable to prove the computations of the safety valve capacity it may be done in: a) two ways b) three ways c) four ways d) five days - correct answer ✅b) three ways when not more than two valves of different sizes are mounted singly. the relieving capacity of the smaller valve shall not be less than _______ percent of the larger valve. a) 20% b) 35% c) 50% d) 70% - correct answer ✅c) 50% MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ the safety valve or valves shall be connected to the boiler independent of any steam connection. a) if under 100psi b) always c) if furnace is stoker fired d) if required by inspector - correct answer ✅b) always no valve of any description shall be placed between the required safety valve or valves and the boiler nor on the discharge pipe between the safety valve and the atmosphere. a) if over 15psi b) if over 100psi c) without written permission from state boiler inspector d) at any time - correct answer ✅d) at any time if a discharge pipe is used on the safety valve, the cross sectional area shall be: a) not less than the full area of the valve outlet MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) two times the full area of the valve outlet c) three times the full area of the valve outlet d) it doesn't make any difference - correct answer ✅a) not less than the full area of the valve outlet safety valves shall operate without chattering and shall be adjusted to close after blowing down not more than: a) 4% but not less than 2 lbs psi b) 3% but not less than 4 lbs psi c) 6% but not less than 4 lbs psi d) 10% but not less than 2 lbs psi - correct answer ✅a) 4% but not less than 2 lbs psi the spring in a safety valve in service for pressure up to 250lbs psi shall not be used for any pressure more than _______ below that for which it is designed. a) 2% above or 2% b) 6% above or 6% MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) it doesn't matter if safety valve leaks some - correct answer ✅c) have valve repaired or replaced the only time it is permissible to set the popping point of a safety valve higher than the S.W.P. is when: a) the boiler is under 5 years old b) approved by the state boiler inspector c) there is more than one valve, one may be 3% above S.W.P d) if there is more than one valve, one may be 6% above S.W.P. - correct answer ✅c) there is more than one valve, one may be 3% above S.W.P when boiler are connected to a common steam header and operate under the same pressure: a) no valve may be set higher the the S.W.P. of the weakest boiler b) all valves may be set 20% higher than the lowest S.W.P. c) some valves may be set 20% higher than the lowest S.W.P. d) set valves according to the S.W.P. of each individual boiler - correct answer ✅a) no valve may be set higher the the S.W.P. of the weakest boiler MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ blow back is: a) number of minutes the valve operated before closing b) volume of steam discharged c) difference between the popping and closing points of the safety valve d) pressure when valve closes - correct answer ✅c) difference between the popping and closing points of the safety valve when two or more safety valves are used on a boiler, they may be mounted: a) on a "T" b) on a "Y" c) on a cross - correct answer ✅b) on a "Y" chattering or rumbling of a safety valve may be due to: a) steam too wet b) broken spring c) dirt or scale on a valve seat or disc MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) valve coming loose from boiler - correct answer ✅c) dirt or scale on a valve seat or disc the variation of the reading on the steam gauge and popping point of a safety valve should not be more than ____ lbs P.S.I. a) 2 b) 4 c) 6 d) 5 - correct answer ✅d) 5 when the discharge pipe of a safety valve extends through the roof it must extend above roof by ___ feet: a) 3 b) 5 c) 6 d) 7 - correct answer ✅d) 7 the minimum blow back on a safety valve of 100lbs is: MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) 7.0 c) 10 to 11 - correct answer ✅b) 7.0 sodium sulfate may be used to: a) diminish caustic embrittlement b) remove oxygen corrosion c) charge zeolite softener - correct answer ✅b) remove oxygen corrosion boiler efficiency is found by using which of the following formulas? a) O / I b) I / O c) O * I - correct answer ✅a) O / I output / input foaming in a boiler is caused by: a) feed water too cold MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) solids too high c) low pH - correct answer ✅b) solids too high when soot blowers are incorrectly adjusted steam from the blower can: a) wear the tubes b) bind the tubes c) cut the tubes - correct answer ✅c) cut the tubes why must the ends of the fire tubes be flared and beaded? a) aid in removal in the future b) aid in the flow of flue gases c) for expansion and contraction d) - correct answer ✅b) aid in the flow of flue gases if 80,000 BTUs are absorbed into the water of a boiler and 100,000 BTUs are supplied in the fuel to the fire box what would the efficiency of the boiler be? a) 120 MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) 100 c) 80 - correct answer ✅c) 80 80000 divided by 100000 output / input a compound engine uses the same steam: a) 1x b) 2x c) 3x d) 4x - correct answer ✅b) 2x the blow-back Ring should be adjusted so the blow back on a safety valve up to 100 pounds will not be less than: a) 2 pounds b) 4 pounds MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) 150 horsepower b) 600 horsepower c) 500 horsepower - correct answer ✅c) 500 horsepower if you were to fail a Chief Engineers exam, how long must you wait before you would be allowed to take the test again? a) 10 days b) 30 days c) 90 days d) 120 days - correct answer ✅b) 30 days Same for all exams Recent change what should be displayed in the boiler room? a) vacation schedule b) engineer's license, and exemption or inspection certificates MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ c) the manufacturers book of operation on the boiler - correct answer ✅b) engineer's license, and exemption or inspection certificates a second-class engineer make a complete charge of a boiler plant not to exceed: a) 10 horsepower b) 100 horsepower c) 500 horsepower d) unlimited horsepower - correct answer ✅b) 100 horsepower when determining which engineers license is needed, the total horsepower connected to the common header is used. a) true b) false - correct answer ✅a) true in a boiler plant where there are two 250 horsepower boilers (using heating surface) connected to the same common header, what engineers license would be required to be in charge of the plant? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) chief engineer b) first class engineer c) second class engineer d) special engineers license - correct answer ✅b) first class engineer in a boiler plant where there are two 250 horsepower boilers (using heating surface) connected to the same common header, what shift engineers license would be required for this plant? a) chief engineer b) first class engineer c) second class engineer d) special engineers license - correct answer ✅c) second class engineer a special engineers license is for high or low pressure boilers not to exceed 50 boiler horsepower. a) true b) false - correct answer ✅a) true MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ steam or other vapor pressure in excess of 15 psig, or a water or other liquid boiler, in which the pressure exceeds 160 psig or the temperature exceeds 250 degrees Fahrenheit a special engineer's license would allow you to operate what? a) a low-pressure boiler not to exceed 50 horsepower b) high and low-pressure boilers and their appurtenances of not more than 50 horsepower c) a 50-horsepower boiler - correct answer ✅b) high and low-pressure boilers and their appurtenances of not more than 50 horsepower a shift engineer in a high pressure, high temperature, hot water plant of 500 bhp must have a(n) a) 1st class grade A or B license b) 2nd class grade A or B license c) chief grade A or B license - correct answer ✅b) 2nd class grade A or B license MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ the division of boiler inspection May suspend or revoke the license of any Master pilot or engineer found under the influence of drugs or alcohol when on duty a) true b) false c) only if it's done three or more times - correct answer ✅a) true boilers found to be operated by unlicensed or improperly licensed persons shall not be used until the operators are properly licensed a) true b) false c) dependent upon the condition of the boilers - correct answer ✅a) true how often must you renew your high or low-pressure boiler engineer's license? a) once a year b) once every two years c) only once in a lifetime MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) - correct answer ✅b) once every two years a company is monitoring boilers by remote electronic surveillance. Do they need a licensed engineer for monitoring? a) only on high-pressure boilers b) yes c) no, see section 13, 183. 501 - correct answer ✅c) no, see section 13, 183. 501 what equipment would you be allowed operating responsibility for with a first class engineer's license Grade B? a) low-pressure boilers and their appurtenances b) low and high-pressure boilers c total boiler horsepower not to exceed 50 horsepower liquid or vapor boilers and their appurtenances. - correct answer ✅c total boiler horsepower not to exceed 50 horsepower liquid or vapor boilers and their appurtenances. MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ "Operating experience" according to MN state statutes includes includes which of the following? a) Boiler Operation b) Maintenance c) Training d) Observation e) Personal Participation - correct answer ✅all a) Boiler Operation b) Maintenance c) Training d) Observation e) Personal Participation A chief class operating license is required to take charge of a boiler plant over what horsepower? a) 50 bhp b) 500 bhp c) 300 bhp - correct answer ✅c) 300 bhp MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ must be in attendance 4 hrs a day for 5 days a week except for sick and vacation time or holidays. Minimum passing grade for MN boiler exams is... percent? a) 60 b) 70 c) 80 - correct answer ✅b) 70 For purposes of the exam, experience must be obtained within the previous how many years? a) 5 b) 20 c) 10 - correct answer ✅c) 10 For purposes of the exam a "year of experience" is defined as? a) a twelve month period for low pressure boiler, including off season maintenance. b) 2,000 hrs or more MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ c) all of above - correct answer ✅c) all of above For purposes of the exam only, a boiler horsepower is defined as? a) 10 sq ft of heating surface b) boiler BTU input / 676,000 c) 10 kw d) all of above - correct answer ✅a) 10 sq ft of heating surface b) boiler BTU input / 676,000 c) 10 kw d) all of above a high pressure boiler plant of 30 or less bhp must be attended (checked) to? a) daily b) 4 hours a day c) cannot be left unattended over consecutive 2 hrs - correct answer ✅a) daily MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ (750,000 / 67,000 = 11.19 bhp) T/F ? A safety valve may NOT have a valve on its discharge piping. - correct answer ✅True T/F ? A safety valve must discharge at least SEVEN feet from running boards, rooftops, platforms, or adjacent areas. - correct answer ✅True T/F ? A water gauge glass 7 feet or more from operating floor must have a visible indication of its position (on/ off). - correct answer ✅True T/F ? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ IF there is a valve in line between a boiler and the water column, they must be visibly open and locked in the open position during operation - correct answer ✅True T/F ? The water column must have at least a 3/4 inch drain pipe. - correct answer ✅True each steam gauge shall have be connected with a valve with a tee or lever with handle parallel to pipe when open and must be connected to at least what pipe size siphon? a) 1/4 inch b) 1/2 inch c) 1 inch - correct answer ✅a) 1/4 inch the dial of the steam gauge must be read AT LEAST what percent above the safety valve setting? a) 6% b) 150% MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ c) 200% - correct answer ✅b) 150% must be at least 150% approximately 200% is preferable valves and fittings on feedwater piping including check valves must supply feedwater at what percent of MAWP ? (Maximum Allowable Working Pressure) a) 106% b) 125% c) 200% - correct answer ✅b) 125% Valves and fittings made of any material and rated 125 lbs or more get an reduction in pressure rating of what percent when used in blow off and feed water lines? a) 10% b) 15% c) 20% - correct answer ✅c) 20% MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ according to boiler license law enacted in 1982, who is allowed to fill out an affidavit for a person applying for a second class license or higher , boiler license? a) the employer or a second class engineer b) the applicant c) any licensed engineer in MN - correct answer ✅a) the employer or a second class engineer A special engineer shift engineer in no more than a plant of what size? a) 50 bhp b) 100 bhp c) unlimited bhp - correct answer ✅b) 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? a) 200 bhp b) 500 bhp c) unlimited bhp - correct answer ✅b) 500 bhp MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ could a first class grade A engineer be in charge of a low pressure boiler of 400 bhp? a) yes b) no c) if the boiler was approved by the A.S.M.E. - correct answer ✅a) yes a hot water boiler is considered to be a high pressure boiler when it: a) exceeds 250 degrees Fahrenheit, or160 psi b) exceeds 100 psi c) exceeds 15 psi d) None of the above - correct answer ✅a) exceeds 250 degrees Fahrenheit, or160 psi when operating a hot water boiler, what could cause the safety valve to lift? a) water too cold for the system b) expansion tank filled with water c) not enough pressure - correct answer ✅b) expansion tank filled with water MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what is the purpose of an expansion tank for a hot water boiler? a) to allow for expansion and contraction of water volume at varied temperatures b) it has little value and could be plugged c) the expansion tank will hold the extra water needed for operation d) none of the above - correct answer ✅a) to allow for expansion and contraction of water volume at varied temperatures on some hot water boilers, a run around pump is used. What is its purpose? a) to increase circulation and bring the boiler up to temperature faster b) it keep the discharge and return lines at the same pressure c) to increase discharge pressure - correct answer ✅a) to increase circulation and bring the boiler up to temperature faster also makes temperature move even reducing temperature fluctuations what is the purpose of a low limit control on a hot water heater? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ c) a high limit control d) none of the above - correct answer ✅a) a low limit control can high temperature high pressure hot water be converted to low pressure steam? a) yes, by using a larger pipe b) no, it cannot be done. c) yes, with the use of a heat exchanger - correct answer ✅c) yes, with the use of a heat exchanger comparing hot water boilers to steam boilers, what auxiliaries are eliminated? a) steam traps, condensate tanks, D.A. tanks b) both systems need the same auxiliaries c) strainers and reciprocating pumps - correct answer ✅a) steam traps, condensate tanks, D.A. tanks MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ in addition to A.S.M.E. safety valve, what other safety device should be installed on hot water boilers? a) a low water fuel cut off b) steam safety valves c) purge valve - correct answer ✅a) a low water fuel cut off can low water occur in a hot water boiler? a) no, because the boiler is filled with water b) yes, for numerous reasons c) only if the water is too hot - correct answer ✅b) yes, for numerous reasons a second class engineer grade C could operate as a shift engineer in a low pressure steam or hot water plant of not more than? a) 100 hp b) 500 hp c) unlimited HP - correct answer ✅b) 500 hp MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what kind of valve should be used for high pressure, high temperature, hot water boilers? a) any kind of low pressure valves can be used b) brass or bronze valves c) valve seats. plugs, and bodies should be made of only cast steel, forged steel or steel alloys - correct answer ✅c) valve seats. plugs, and bodies should be made of only cast steel, forged steel or steel alloys what is meant by the term low pressure boiler? a) boilers operating at 15 psig steam or 30 psig hot water b) boilers operating at a steam or other vapor pressure of 15 psig or less or a water or other liquid boiler in which the pressure does not exceed 160 psig or a temperature of 250 degrees F c) 15 psig or less steam boilers, 60 psig hot water boilers d) boilers operating at 15 psig steam or other vapor and less the 232 degrees F hot water heater - correct answer ✅b) boilers operating at a steam or other vapor pressure of 15 psig or less or a water or other liquid boiler in which the pressure does not exceed 160 psig or a temperature of 250 degrees F MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) safety valve and/or liquid relief valve c) steam safety valve only d) a liquid relief valve only - correct answer ✅a) safety valve and/or an A.S.M.E. approved safety valve a tri indicator would be found on a(n)? a) hot water boiler b) steam boiler c) a special boiler only - correct answer ✅a) hot water boiler a tri indicator would inform the boiler operator of ? a) 1 amount of water, 2 level of water, 3 low on water b) 1 temperature of the water, 2 pressure of the water in psi, 3 altitude of the water in feet c) 1 pressure of the water 2 amount of water, 3 level of the water. - correct answer ✅b) 1 temperature of the water, 2 pressure of the water in psi, 3 altitude of the water in feet MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what is the destructive force in a steam or hot water boiler explosion? a) the instant release of energy stored as heat in the water b) combustion of the fuel c) the moving boiler only - correct answer ✅a) the instant release of energy stored as heat in the water An ASME approved safety relief valve used on a hot water boiler is tested at the factory on what? a) hot water only b) steam first then hot water c) steam only - correct answer ✅b) steam first then hot water some of the things you could find on a steam of hot water boiler are? a) 1 pressuretrols 2 steam gauges 3 tricocks b) 1 gauge glass 2 safety glass 3 gauge cocks c) 1 low water cut off 2 safety valve or safety relief valve 3 pressure gauge - correct answer ✅c) 1 low water cut off 2 safety valve or safety relief valve 3 pressure gauge MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ what device would only be found on a steam boiler? a) 1 steam gauge 2 tricocks 3 pressuretrols b) 1 bottom blow down valve 2 gauge glass 3 siphon c) 1 gauge glass 2 pressure gauge 3 tri indicator - correct answer ✅a) 1 steam gauge 2 tricocks 3 pressuretrols an expansion tank or compression tank would be used with? a) hot water boiler b) steam boiler only c) special boiler only - correct answer ✅a) hot water boiler the purpose of an expansion tank is to? a) let steam into the system b) provide for expansion and contraction of the water volume as the temperature varies c) allow for the expansion of steam - correct answer ✅b) provide for expansion and contraction of the water volume as the temperature varies MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ c) sometimes - correct answer ✅a) true safety valves or safety relief valves should be manually tested at least? a) true b) false c) sometimes - correct answer ✅... the low water cut out is one of the most important electrical / Mechanical devices on your boiler. how often should it be tested? a) hourly b) weekly c) yearly d) daily - correct answer ✅d) daily what device must be located between a hot water boiler and the expansion tank? a) a shut-off valve, so the expansion tank can be isolated and drained during the operation of the boiler MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) 2 temperature controls c) a low fire limit control - correct answer ✅a) a shut-off valve, so the expansion tank can be isolated and drained during the operation of the boiler on a hot water boiler, every time the burner operates the safety relief valve opens. Why? a) too high of a temperature b) the expansion tank is waterlogged or the isolating valve for the expansion tank is closed c) the burner needs adjustment - correct answer ✅b) the expansion tank is waterlogged or the isolating valve for the expansion tank is closed an aquastat is used on a? a) hot water boiler b) steam boiler only c) both types of boilers - correct answer ✅a) hot water boiler MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ An aquastat is a device used in hydronic heating systems for controlling water temperature. To prevent the boiler from firing too often, aquastats have a high limit temperature and a low limit to reduce thermal shock on hot water boilers, what devices are used? a) a hot water heater, an electric heater, or an air preheater b) 1 low limit or low fire hold control, 2 a three-way valve, 3 a run around pump c) none of the answers given above - correct answer ✅b) 1 low limit or low fire hold control, 2 a three-way valve, 3 a run around pump on a steam boiler, the control named the operator will? a) on pressure decrease; start: on pressure increase, stop; b) on pressure decrease; stop: on pressure increase, start; c) none of the above - correct answer ✅a) on pressure decrease; start: on pressure increase, stop; on a hot water boiler, the control called the operator will? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ on a closed system, why must there be a drain line on the expansion or compression tank? a) so that any extra air can be evacuated from the system b) so that if the expansion or compression tank become waterlogged, there is a way of draining them c) a drain line is not required on a closed hot water system d) a drain line is only required on an open hydronic system - correct answer ✅b) so that if the expansion or compression tank become waterlogged, there is a way of draining them how do we know if the impeller on a hot water recirculating pump is going in the right direction? a) the vanes of the impeller will be slapping the water b the vanes on the impeller will be digging into the water c) it does not make any difference d) none of the answers given - correct answer ✅a) the vanes of the impeller will be slapping the water MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a hot water boiler is considered to be a low-pressure boiler when it...? a) does not exceed 15 PSIG b) exceeds 100 PSIG c) does not exceed 250 degrees Fahrenheit in temperature or 160psi in pressure d) it stays below 212 degrees Fahrenheit and temperature and is under 10 PSIG in pressure - correct answer ✅c) does not exceed 250 degrees Fahrenheit in temperature or 160psi in pressure what is the purpose of an expansion tank used with a hot water boiler? a) expansion tank will hold extra water for operation of the boiler b) it has little value and could be plugged c) expansion tank allows for expansion and contraction of the water volume as its temperature varies d) none of the answers given - correct answer ✅c) expansion tank allows for expansion and contraction of the water volume as its temperature varies On some hot water boilers, a run-around pump is used. What is its purpose? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) to keep discharge and return lines at the same pressure b) to increase circulation and bring the hot water boiler up to operating temperature faster c) to increase the discharge pressure d) none of the answers given - correct answer ✅b) to increase circulation and bring the hot water boiler up to operating temperature faster what is the purpose of the low limit control on a hot water boiler? a) a low limit control is not used on a hot water boiler b) this control will not allow the burner to leave low fire position until the temperature of the water in the boiler reaches 150 degrees Fahrenheit c a low limit control will reduce pressure on the hot water system d) a low limit control will it reduce pressure on the recirculating pump - correct answer ✅b) this control will not allow the burner to leave low fire position until the temperature of the water in the boiler reaches 150 degrees Fahrenheit what firing control will help prevent thermal shock to the hot water boiler? a) an operating pressure control MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ b) the horsepower of the pump c) the output of the pump in gallons per minute d) all of the answers mentioned - correct answer ✅c) the output of the pump in gallons per minute will static head in a hot water system reduce the output of the recirculating pump in gallons per minute? a) it depends on the temperature of the water b) yes c) no d) none of the answers given - correct answer ✅b) yes name one way an expansion tank can become waterlogged? a) air could escape past the upper gauge glass fitting b) too much pressure in the system c) not enough pressure in the system d) none of the answers given - correct answer ✅a) air could escape past the upper gauge glass fitting MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a device that controls the stopping and starting of the burner on a hot water boiler is a/n? a) pressure trol b) aqua-stat c) low water cut out d) sail switch - correct answer ✅b) aqua-stat if the expansion or compression tank becomes waterlogged and the burner starts what may happen? a) nothing b) boiler will explode c) safety relief valve may lift d) the pressure in the system will decrease - correct answer ✅c) safety relief valve may lift When comparing a hot water boiler to a steam boiler, what auxiliaries are eliminated? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) steam traps, condensate tanks, and pumps b) both systems need the same auxiliaries c) strainers in recirculating pumps d) aquastats and recirculating pumps - correct answer ✅a) steam traps, condensate tanks, and pumps after a hot water boiler has ben drained, cleaned, and refilled with water, what must be done? a) reset aquastats b) blowdown c) evacuation of air from the system d) reset the sail switch - correct answer ✅c) evacuation of air from the system in addition to a safety relief valve, what other safety devices should be installed on a hot water boiler? a) a safety purge valve b) a low water cut out control MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) none of the answers given - correct answer ✅c) yes if water flows continuously from the gauge glass drain line the most dangerous action the boiler operator can take when water cannot be found in the boiler is to what ? a) increase the pressure on the boiler b) add water to the boiler c) shut off the burner d) change fuels - correct answer ✅b) add water to the boiler all low water cut-offs should be taken apart and cleaned and inspected how often? a) yearly b) every five years c) every three years d) never - correct answer ✅a) yearly if a magnetrol low water cut off hangs up, the boiler operator should? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) take apart the low water cut out and check the enclosing tube to see if the steel rod is sticking inside it. b) replace the magnets c) replace the floats d) replace the switches - correct answer ✅a) take apart the low water cut out and check the enclosing tube to see if the steel rod is sticking inside it. if a float type of low water cutoff hangs up, the boiler operator should? a) replace the float b) replace the Mercury switch c) check the float chamber for mud or sediment d) adjust the float - correct answer ✅c) check the float chamber for mud or sediment if an electrode type of low water cut off does not work you should? a) increase the voltage b) check the electrodes for bridging c) replace the electrodes MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ d) replace the entire unit - correct answer ✅b) check the electrodes for bridging a skilled boiler operator can use a pressure gauge to indicate a waterlogged expansion tank? a) no b) only if the boiler is up to pressure c) yes d) none of these answers - correct answer ✅c) yes How? what is the combustion air called? a) primary b) excess c) primary and secondary - correct answer ✅c) primary and secondary the absolute pressure on a boiler is 174.7. what is the gauge pressure? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) 31.1 PSIG b) 33.3 PSIG c) 45 PSIG - correct answer ✅...b) 33.3 PSIG pressure of water per foot column is .433 .433 x (.70 % full x 110 feet) = .433 x 77 = 33.3641 given an oil tank filled with #6 oil is 110 feet high and 90 feet in diameter filled 70% what is the minimum vent pipe size ? a) 1 1/2" b) 2 1/4" c) 3 1/2" - correct answer ✅b) 2 1/4" (code?) given an oil tank filled with #6 oil is 110 feet high and 90 feet in diameter filled 70% MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ How many gallons can the tank hold? a) b) c) - correct answer ✅vol = 3.14 x 45 ^2 x 110 = 3.14 x 6358.5 x110 = 6358.5 cubic ft times 7.5 V=π r2 h cubic ft 7.5 gals 47,688.75 given an oil tank filled with #6 oil is 110 feet high and 90 feet in diameter filled 70% what device is used to measure the oil level in this tank?? a) an oil level indicator b) fuel gauge c) pneumercator - correct answer ✅c) pneumercator what are two common minerals that cause hardness and scale formation in boilers? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) lime and salt b) calcium and magnesium carbonate c) sodium bicarbonate and sodium cloride - correct answer ✅b) calcium and magnesium carbonate Common feed water contaminants that can form boiler deposits include calcium, magnesium, iron, aluminum, and silica. what is priming in relation to boilers? a) carry over water in the steam b) removing air from a system c) using numbers that can only be divided by themselves and one - correct answer ✅a) carry over water in the steam name two types of boilers that use stay bolts? a) locomotive and boats b) HRT and scotch boilers c) fire tube and water tube - correct answer ✅b) HRT and scotch boilers MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ list 5 ways to determine boiler horsepower. a) BTU (1bhp = 33,475BTU/hr) b) sq ft heating surface (1bhp = 10sq ft) c) evaporation of water (1bhp = 34.5lbs/water/hr@212deg f) d) ft lbs (1bhp = 33,000 ft lbs/ minute) e) kw (1bhp = 10 kw/ hr) - correct answer ✅a) BTU (1bhp = 33,475BTU/hr) b) sq ft heating surface (1bhp = 10sq ft) c) evaporation of water (1bhp = 34.5lbs/water/hr@212deg f) d) ft lbs (1bhp = 33,000 ft lbs/ minute) e) kw (1bhp = 10 kw/ hr) two safety valves are required on boilers over how many sq ft of heating surface? a) 10 sq ft b) 100 sq ft c) 500 sq ft - correct answer ✅c) 500 sq ft MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ on a low-pressure boiler, what is the MAWP ? a) 10 psi b) 15psi c) 100 psi - correct answer ✅b) 15psi if the safety valve(s) on a boiler were set at 12 psi, what is the maximum psi allowed? (before the safety valve opened) a) 11 psi b) 13 psi c) 15 psi - correct answer ✅b) 13 psi (before the safety valve opened) or (max pressure the boiler could reach)? Who can service safety valves? a) licensed boiler operator b) chief boiler inspector or his representative c) anyone qualified or trained like a company rep - correct answer ✅c) anyone qualified or trained like a company rep MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ which of the following are correct conversions of temperature? a) F = 9/5 c +32 deg = C b) C x 1.8 +32 deg = F c) C = 5/9 (F-32 deg) = F d) F -32 deg x 5/9 =C e) F -32 deg / 1.8 =C f) C x 9/5 +32 deg =F - correct answer ✅all are correct What is the purpose of the 'R' stamp? a) Signifies qualified repair/modification facility b) Indicates repaired boiler c) remodeled boiler stamp - correct answer ✅a) Signifies qualified repair/modification facility What is meant by "pitch of rivets"? a) The center-to-center distance of adjacent rivets MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) a safety valve has a huddling chamber, located between the valve seat and atmosphere which confines steam, thus increasing upward load, lifting the spring higher and providing a closing snap . b) a place for steam to escape when the valve is lifted thus providing an efficient release of pressure to quickly reduce pressure in a boiler c) place for steam to accumulate at higher temperatures to more quickly be released to the atmosphere, reducing pressure in a boiler faster - correct answer ✅a) a safety valve has an adjustable pop, or huddling chamber, located between the valve seat and atmosphere which functions to confine steam temporarily, thus increasing the upward load, lifting the spring higher and providing a subsequent closing snap with pressure reduction. What is blowback or blowdown on a safety valve? a) blowdown, or blowback is the released steam and hot water released when safety valves are open b) The difference between actual popping pressure of a pressure relief valve and reseating pressure expressed as a percentage c) the difference between the opening and closing pressure of a safety release valve - correct answer ✅b) The difference between actual popping MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ pressure of a pressure relief valve and reseating pressure expressed as a percentage c) Blowback or Blowdown is the difference between the opening and closing pressure and is expressed as a percentage of working pressure maximum over MAWP that a safety valve is allowed to release? a) in no case to more than 3 percent above b) in no case to more than 6 percent above c) in no case above MAWP - correct answer ✅b) in no case to more than 6 percent above on a low pressure boiler, over what sq ft require 2 safety valves? a) 100 b) 500 c) 750 - correct answer ✅b) 500 super-heater valves must be set ( ) the safety valves on steam drum? MN Boiler License Questions Verified answer (Latest 2023) MN Boiler License Questions Verified answer (Latest 2024 )RATED A+ a) higher b) at c) below - correct answer ✅c) below superheater valves should be set at least 5psi lower than drum valves How are superheaters kept from burning up during start up and shut down? a) using a vent to allow steam through it keeps it cool enough to prevent overheating b) there is a drain after superheater and before the main steam line c) opening a vent on shut down to prevent vacuum from forming d) all answers are correct - correct answer ✅d) all answers are correct preferred answewr b) there is a drain after superheater and before the main steam line super-heater vents are opened before firing a boiler to MN Boiler License Questions Verified answer (Latest 2023)