MN Boiler License Questions with 100% Correct Answers | Verified | Updated 2024, Exams of Advanced Education

Download MN Boiler License Questions with 100% Correct Answers | Verified | Updated 2024 and more Exams Advanced Education in PDF only on Docsity! MN Boiler License Questions with 100% Correct Answers | Verified | Updated 2024 what are the conditions necessary for good combustion? a) low sulfur content b) Thermal, thermocoupler, 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 pg. 1 professoraxe l 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 c) air supplied above that theoretically required - Correct Answer-c) air supplied above that theoretically required pg. 2 professoraxe l 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 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 pg. 5 professoraxe l 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: 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 pg. 6 professoraxe l 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? a) Yes, if they are locked or sealed open b) no, they might be closed accidentally c) only if the boiler is under 100 horsepower - Correct Answer- a) Yes, if they are locked or sealed open can you have valves between boiler and water column? a) Yes, if they are locked or sealed open b) no, they might be closed accidentally c) only if the boiler is under 100 horsepower - Correct Answer- a) Yes, if they are locked or sealed open pg. 7 professoraxe l what must you have between two stop valves on the steam outlet and between the header line? a) thermocoupler 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 pg. 10 professoraxe l b) globe c) check - Correct Answer-c) check 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: pg. 11 professoraxe l a) 4% above S.W.P. or valve setting b) 5% above S.W.P. or valve setting c) 6% above S.W.P. or valve setting d)10 % above S.W.P. or valve setting - Correct Answer-c) 6% above S.W.P. or valve setting the maximum steaming capacity of a boiler shall be based on the: a) capacity of the fuel burning equipment, air supply, draft, etc. b) ability of the fireman c) type of boiler under test d) temperature of ht boiler feed water - Correct Answer-a) capacity of the fuel burning equipment, air supply, draft, etc. one of mare safety valves on the boiler proper shall be set: a) at or below the maximum allowable working pressure b) not more than 6% above the maximum allowable working pressure c) not more than 10% above the maximum allowable working pressure pg. 12 professoraxe l 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 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 pg. 15 professoraxe l 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% c) 10% above or 10% d) 12% above or 12% - Correct Answer-c) 10% above or 10% for pressure above 250lbs P.S.I. , the safety relief shall not have a pressure more than ______ below that that for which it is designed. a) 2% above or 2% b) 5% above or 5% c) 6% above or 6% pg. 16 professoraxe l d) 10% above or 10% - Correct Answer-b) 5% above or 5% every attached super-heater shall have one or more safety relief valves: a) near the outlet b) between boiler and super-heater c) between super-heater and turbine or engine d) if steam is used to operate turbine - Correct Answer-a) near the outlet safety valves used on a super-heater discharging super-heated steam at a temperature over 450 degrees F shall have a body bonnet and be made of: a) brass b) cast iron c) malleable iron d) steel alloy - Correct Answer-d) steel alloy the spring in a super-heater discharging super-heated steam at a temperature over 450 degrees F, must be : a) outside the valve casting pg. 17 professoraxe l 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 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 pg. 20 professoraxe l c) 6 d) 7 - Correct Answer-d) 7 the minimum blow back on a safety valve of 100lbs is: a) 6 b) 2 c) 4 - Correct Answer-b) 2 how often should you pop a safety valve on a high pressure boiler? a) as often as needed b) daily c) yearly d) monthly - Correct Answer-a) as often as needed who is permitted to adjust safety valves? a) inspector b) qualified person c) any chief engineer - Correct Answer-b) qualified person pg. 21 professoraxe l new boilers and bills on which extensive replacement of pressure parts must be given what kind of test? a) hydrostatic b) A.S.M.E. c) alkaline - Correct Answer-a) hydrostatic priming is a condition in which water is: a) too hot for pump b) too low for pump to lift c) suddenly discharged with steam - Correct Answer-c) suddenly discharged with steam phosphate salts are used extensively to: a) prevent scale deposits b) reduce oxygen in feed water c) increased pH - Correct Answer-a) prevent scale deposits boiler feed water is neutral in pH is: a) 8.3 b) 7.0 c) 10 to 11 - Correct Answer-b) 7.0 pg. 22 professoraxe l 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 c) 6 pounds d) 10 pounds - Correct Answer-a) 2 pounds lubricating oil reaches a breakdown point at: a) 80 degrees b) 160 degrees c) 240 degrees d) 320 degrees - Correct Answer-b) 160 degrees pg. 25 professoraxe l a bearing is said to be brass bound when: a) it is made of brass b) it is held together with a brass ring c) the babbit is all worn out d) brass bolts are used - Correct Answer-c) the babbit is all worn out if the valves are used on the water column connections, they must be: a) check valves b) blow off type valves c) valves that can be locked open d) lever valves - Correct Answer-c) valves that can be locked open valves used for throttling action should be: a) check valves b) globe valves c) butterfly valves d) gate valves - Correct Answer-b) globe valves pg. 26 professoraxe l what is the maximum boiler horsepower you may take charge of on a chief engineer license? a) 100 horsepower b) unlimited horsepower d) 500 horsepower - Correct Answer-b) unlimited horsepower a first-class engineer may take charge of a boiler plant not to exceed: 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 pg. 27 professoraxe l a) true b) false - Correct Answer-a) true to whom would you report a boiler condition you thought not safe? a) sheriff b) boiler inspector c) would not report it - Correct Answer-b) boiler inspector what grade license must the shift operator have where a chief engineer has charge of a plant of 500 boiler horsepower? a) chief engineer b) first class engineer c) second class engineer d) special engineers license - Correct Answer-c) second class engineer an engineer with one year of actual boiler experience verified by an affidavit would be allowed to take the exam for: a) first class engineer b) second class engineer pg. 30 professoraxe l c) chief engineer d) special engineers license - Correct Answer-b) second class engineer an engineer having an engineers license, with three years actual boiler operating experience, verified by one of more affidavits would be allowed to take an exam for: a) first class engineer b) second class engineer c) chief engineer d) special engineers license - Correct Answer-a) first class engineer What is meant by a high-pressure boiler? a) anything over 15 PSI b) steam in excess of 15 psi or water or other liquid in excess of 212 degrees Fahrenheit c) a boiler operating at 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 - Correct Answer-c) a boiler operating at a pg. 31 professoraxe l 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 pg. 32 professoraxe l b) only chief A or B c) Chief A, B or C license - Correct Answer-c) Chief A, B or C license The energy rate needed to evaporate 34.5lb of water at 212 °F (100 °C) in one hour. Equal to 33,475 BTU/h. Approximately 9.810657 x 103 over 500hp to unlimited requires chief What class and grade of license must the shift engineer have where a chief engineer has charge of a hot water plant operating be 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 degrees Fahrenheit and 160 PSIG total boiler horsepower of 500 bhp? a) A 2nd Class Grade A, B or C License b) A 1st Class Grade A, B or C License c) Only a 2st Class A or B - Correct Answer-a) A 2nd Class Grade A, B or C License (ASME) stand for what? pg. 35 professoraxe l a) American Standards for Mechanical Electricians b) American Society of Mechanical Engineers c) Allied Sciences and Mechanics Emeritus - Correct Answer-b) American Society of Mechanical Engineers founded in 1880 (ASME) developed the 'Boiler and Pressure Vessel Code' which forms the basis for laws in the US and Internationally in what year? a) 1880 b) 1920 c) 1914 - Correct Answer-c) 1914 "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 pg. 36 professoraxe l 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 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? pg. 37 professoraxe l c) cannot approach near continuous absence - Correct Answer-b) may be left for 30 mins as long as they are within 500ft of boiler room c) cannot approach near continuous absence (cannot leave near 2 hrs check in briefly and leave again for 2 more. must check equipment for normal operation.) T/F ? An automatically fired steam boiler must have a low water cut off that cuts off fuel in case of low water condition. (over 750,000 Btu) - Correct Answer-True T/F ? An automatically hot water (or other liquid) boiler does not need a low water cut off that cuts off fuel in case of low water condition. (over 750,000 Btu) - Correct Answer-False T/F ? In a coil type (fire tube) boiler over 500 sq ft must have three or more safety valves. - Correct Answer-False pg. 40 professoraxe l In a coil type (fire tube) boiler over 500 sq ft must have TWO or more safety valves. T/F ? In a high pressure boiler plant over 750,000 Btu, there must be a flow sensing device to cut off fuel in case of loss of circulating flow. - Correct Answer-True (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 ? pg. 41 professoraxe l 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 ? 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? pg. 42 professoraxe l b) boilers operating at 15 PSIG for steam or hot water boilers or 30 PSIG or 212 degrees Fahrenheit c) 15 PSIG or less steam boilers and 60 PSIG hot water boilers d) boilers operating at a steam or other vapor pressure of 15 PSIG or less or water or other liquid boiler and which the pressure does not exceed 160 PSIG or a temperature of 250 degrees Fahrenheit - Correct Answer-... A special engineer may serve as an apprentice in what size maximum vapor boiler plant? a) 100 hp high or low pressure plant b) in any plant under direct supervision of the properly licensed engineer c) 50 horsepower high or low pressure plant - Correct Answer- a) 100 hp high or low pressure plant under direct supervision of properly licensed engineer 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 pg. 45 professoraxe l 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 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 pg. 46 professoraxe l 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 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 pg. 47 professoraxe l b) yes because of the A.S.M.E. code c) no, because such a valve may be sized to handle liquids only. c) if the boiler was approved by the A.S.M.E. - Correct Answer- b) yes because of the A.S.M.E. code with a current state of MN Chief Engineer's license (grade C) you would be allowed to operate and take charge of: a) boilers of unlimited hp not to exceed 250 degrees F or 160 psi hot water and 15 psi steam b) boilers of unlimited hp and above 250 degrees F or 160 psi hot water and at 15psi steam pressure. c) boilers of unlimited hp above 15 psi, but below 250 degrees F or 160 psi hot water. - Correct Answer-a) boilers of unlimited hp not to exceed 250 degrees F or 160 psi hot water and 15 psi steam What firing control will prevent thermal shock to a hot water boiler? a) a low limit control b) an operating control c) a high limit control pg. 50 professoraxe l 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 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 pg. 51 professoraxe l 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 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 pg. 52 professoraxe l d) to remove excess water from the boiler - Correct Answer-b) shut off the burner when low water conditions arise the valve or valves that must relieve all excess pressure on a steam or high pressure water boiler are...? a) safety valve and/or an A.S.M.E. approved safety valve 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 pg. 55 professoraxe l 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 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 pg. 56 professoraxe l 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 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 pg. 57 professoraxe l 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 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 pg. 60 professoraxe l 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 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 pg. 61 professoraxe l 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? a) on temperature increase, start; on temperature decrease, stop b) on temperature increase, stop; on temperature decrease, start c) none of the above - Correct Answer-b) on temperature increase, stop; on temperature decrease, start on a steam boiler, what is the siphon or pigtail used for? a) to let steam leaves the boiler pg. 62 professoraxe l 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 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 pg. 65 professoraxe l 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? 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 pg. 66 professoraxe l 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 b) a high limit control c) a low limit temperature control d) al of the answers mentioned are correct - Correct Answer-c) a low limit temperature control can air cause circulation problems in a hot water system? pg. 67 professoraxe l 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 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? pg. 70 professoraxe l 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? 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 pg. 71 professoraxe l 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 c) pressure trol d) al of the answers given - Correct Answer-b) a low water cut out control can a hot water boiler have a low water condition? a) yes, for numerous reasons b) no, because the system is filled with water c) not enough information for an answer d) none of the answers given - Correct Answer-a) yes, for numerous reasons when first coming on duty, the boiler operator should? a) blow down the boiler b) check for water in the pipelines c) check for water in the boiler pg. 72 professoraxe l if a magnetrol low water cut off hangs up, the boiler operator should? 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 pg. 75 professoraxe l c) replace the electrodes 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? pg. 76 professoraxe l a) 160 PSIG b) 189.7 PSIG c) 189.4 PSIG d) 170.0 PSIG - Correct Answer-a) 160 PSIG gauge pressure = total pressure minus 1 atmosphere 14.7 174.7 (total) minus 14.7 (1 atmosphere) = 160 PSIG when the pressure of steam increases, what happens to the volume from a given amount of water?? a) remains the same b) decreases c) increases - Correct Answer-b) decreases when carbon is burned to co (carbon monixide) the combustion is? a) complete b) theoretical c) incomplete - Correct Answer-c) incomplete pg. 77 professoraxe l 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? 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. pg. 80 professoraxe l 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 T /F in a CLOSED feedwater system, steam condenses and becomes part of the feedwater. T) F) - Correct Answer-F in a closed feedwater system, the condensate does not mix with the feedwater heat is transferred by three means. What are they? pg. 81 professoraxe l a) touch, direct heat, and across space b) conduction, radiation, convection c) light, infrared, direct heat - Correct Answer-b) conduction, radiation, convection conduction in solids, convection of fluids (liquids or gases), and radiation through anything that will allow radiation to pass what is "sensible" heat? a) heat you can feel b) heat that shows on a thermometer(measurable) c) common sense heat d) a) and b) - Correct Answer-d) a) and b) a) heat you can feel b) heat that shows on a thermometer what is "latent" heat? a) heat that is waiting to be released b) Heat of a state ie liquid or gas c) can be measured with a thermometer - Correct Answer-b) Heat of a state ie liquid or gas pg. 82 professoraxe l 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 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 pg. 85 professoraxe l b) The distance between the centers of two rivets in the outer row of rivets is called the pitch of the rivets in boilers c) space between two rivets in the boiler - Correct Answer-b) The distance between the centers of two rivets in the outer row of rivets is called the pitch of the rivets in boilers What does the ASME code stand for and what does it do? a) ASME stands for Associated Social Mechanics and Engineers b) ASME stands for Ameican Society of Mechanical Engineers, enforces Boiler and pressure vessel construction and maintenance c) ASME stands for Ameican Society of Mechanical Engineers and gives codes for boiler and pressure vessel construction/maintenance - Correct Answer-c) ASME stands for Ameican Society of Mechanical Engineers and gives codes for boiler and pressure vessel construction/maintenance Who is NBBI and what do they do? a) The National Board of Boiler and Pressure Vessel Inspectors, enforces ASME laws, rules, and regulations relating to boilers and pressure vessels pg. 86 professoraxe l b) The National Board of Boiler and Pressure Vessel Inspectors oversees adherence to ASME laws, rules, and regulations relating to boilers and pressure vessels c) The National Board of Boiler and Pressure Vessel Inspectors, creates ASME laws, rules, and regulations relating to boilers and pressure vessels - Correct Answer-b) The National Board of Boiler and Pressure Vessel Inspectors was created in 1919 to promote greater safety to life and property through uniformity in the construction, installation, repair, maintenance, and inspection of pressure equipment of ASME ; oversees adherence to laws, rules, and regulations relating to boilers and pressure vessels. What does "simmering" mean in relation to boilers? a) when a boiler is almost at boiling, but not at a full boil yet b) leaking valve on a boiler c) Slight leaking due to improper seating of the Safety-valve disk - Correct Answer-c) Slight leaking due to improper seating of the Safety-valve disk what is a "huddling chamber" on a safety valve? a) a safety valve has a huddling chamber, located between the valve seat and atmosphere which confines steam, thus pg. 87 professoraxe l 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 a) allow the superheater to warm up quicker pg. 90 professoraxe l b) let the first steam produced act as a superheater coolant c) ensure drum level does not drop d) verify the operation of the steam flow transmitter e) enhance boiler water circulation - Correct Answer-b) let the first steam produced act as a superheater coolant On a low-pressure boiler, How many sq ft or above must have two safety valves? a) 50 b) 500 c) 1000 - Correct Answer-b) 500 Superheater safety valves must be set ( ) the safety valves on the steam drum? a) Above b) At c) Below - Correct Answer-c) Below Superheater safety valves must relieve at least what percentage of the steam level? a) 100 pg. 91 professoraxe l b) 75 c) 25 - Correct Answer-c) 25 the latent heat of water from solid (ice) to liquid (water) and from liquid to gas (steam)? in BTUs a) 144, 970 b) 320, 244 c) 1, 1000 - Correct Answer-A 144, 970 BTUs A BTU is the amount of energy needed to heat _____ of water _____? a) ounce, 1 F b) pound, 1 F c) kilogram, 1 C - Correct Answer-B pound 1 F pg. 92 professoraxe l