MN Boiler License 258 Questions with 100% Correct Answers., Exams of Boilers and Welding

Download MN Boiler License 258 Questions with 100% Correct Answers. and more Exams Boilers and Welding in PDF only on Docsity! [Document title] [Date] MN Boiler License 2 58 Questions with 100% Correct Answers. 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 secondary air is 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 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 A good percentage of carbon dioxide when burning oil is: a) 12% b) 8 % c) 10% - Correct Answer a) 12% What is draft on a boiler in operation? a) Flow of gases through boiler P a g e 1 | 35 [Document title] [Date] b) Difference in pressure between atmosphere and furnace or firebox c) Difference between atmospheric pressure and breeching - Correct Answer b) difference in pressure between atmosphere and furnace or firebox Which has greater heating value per pound? a) Oil b) Coal - Correct Answer a) oil (18000 - 19500 BTU) (Coal has (6900 - 12910 BTU)) Heavy oil must be heated before entering the burner to: a) Increase carbon content b) Decreased sulfur content c) Get proper atomization - Correct Answer c) get proper atomization Why should a daily log be kept of flue gas temperature? a) Valuable information in case of explosion b) Superintendent files them c) Change an operation, causing heat loss, can be detected - Correct Answer c) change an operation, causing heat loss, can be detected Find SWP of a boiler 72 inches in diameter, thickness of one-half inch, tensile strength of 55,000 pounds, quadruple riveted butt and strap joint (.94) factor of safety 5: a) 14.3 b) 143.6 c) 1436 - Correct Answer b) 143.6 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 What is a pyrite used for? a) Flue gas analyzer b) Combustion programmer c) Water analysis - Correct Answer a) flue gas analyzer Absolute pressure is (ABS): P a g e 2 | 35 [Document title] [Date] 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 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 hot 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 d) Not more than 15% above the maximum allowable working pressure - Correct Answer a) at or below the maximum allowable working pressure If additional valves are used, the highest pressure setting shall not exceed the M.A.W.P. by more than: a) 3% b) 4% c) 5% d) 6% - Correct Answer a) 3% Safety valves shall be: a) Positive weight b) Direct spring loaded type c) Combination of weight and spring d) Doesn’t make any difference - Correct Answer b) direct spring loaded type Dead-weight or weighted-lever safety valves may be used: a) When pressure is less than 100 psi b) Never c) Only by permission of boiler inspector P a g e 5 | 35 [Document title] [Date] 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% 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 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% P a g e 6 | 35 [Document title] [Date] 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% 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 b) Inside the valve casting c) Doesn’t make any difference d) Spring is not used - Correct Answer a) outside the valve casting When a safety valve leaks at a pressure less than that at which it is set to open: a) Tighten the tension on the spring until it stops b) Keep opening and closing by lifting the lever to see if it is seating c) Have valve repaired or replaced 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 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. P a g e 7 | 35 [Document title] [Date] 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 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 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 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 Babbitt is all worn out d) Brass bolts are used - Correct Answer c) the Babbitt 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 P a g e 10 | 35 [Document title] [Date] 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 Recent change What should be displayed in the boiler room? a) Vacation schedule b) engineer's license, and exemption or inspection certificates 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? 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 P a g e 11 | 35 [Document title] [Date] b) First class engineer c) Second class engineer d) Special engineers license - Correct Answer c) second class engineer A special engineer’s license is for high or low pressure boilers not to exceed 50 boiler horsepower. 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 c) Chief engineer d) Special engineers license - Correct Answer b) second class engineer An engineer having an engineer’s 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 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 P a g e 12 | 35 [Document title] [Date] 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 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 bop 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 A high pressure boiler plant of 31 to 200 bop must be attended (checked) to? A) daily b) 4 hours a day c) Cannot be left unattended over consecutive 2 hrs. - Correct Answer c) cannot be left unattended over consecutive 2 hrs. A high pressure boiler plant of over 200 bop must be attended? a) May be left for 15 mines as long as they are within 500ft of boiler room b) May be left for 30 mines as long as they are within 500ft of boiler room c) Cannot approach near continuous absence - Correct Answer b) may be left for 30 mines 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? P a g e 15 | 35 [Document title] [Date] 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 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 bop) 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? 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% c) 200% - Correct Answer b) 150% Must be at least 150% Approximately 200% is preferable P a g e 16 | 35 [Document title] [Date] Valves and fittings on feed water piping including check valves must supply feed water 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 a 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% Steam-discharge outlets must have a stop valve accessible and close to discharge point which is visible and slow opening except which? a) Safety valves B) reheated inlets and outlets C) superheated nets and outlets - Correct Answer a) safety valves B) reheated inlets and outlets c) Superheated nets and outlets For the purpose of rating boiler horsepower for the engineer's license classification only, how many square feet of heating surface shall be equivalent to one boiler horsepower? 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 What is meant by the term low pressure boiler? a) Boilers operating at less than 15 psig steam or other vapor, less than 212 degrees Fahrenheit hot water boiler 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 hip 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 hip 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 P a g e 17 | 35 [Document title] [Date] 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 hip b) 500 hip c) Unlimited HP - Correct Answer b) 500 hip What kind of valve should be used for high pressure, high temperature, and 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 A person holding a current MN special engineer license could be in charge of...? a) Low pressure boilers only b) High pressure boilers only c) High and low pressure steam boilers only d) High and low pressure boilers not to exceed a total of 50 bop - Correct Answer d) high and low pressure boilers not to exceed a total of 50 bop A special engineer could be a shift engineer in a plant of not more than? a) 30 bop b) Unlimited bop c) 300 bop d) 100 bop - Correct Answer d) 100 bop P a g e 20 | 35 [Document title] [Date] A special engineer may serve as an apprentice in what size water or other liquid or steam or other vapor boiler? a) In any plant regardless of the size, under direct supervision of the properly licensed engineer b) Only in plants that do not exceed 300 bop c) 30 bop high or low pressure d) 200 bop or more high or low pressure - Correct Answer a) in any plant regardless of the size, under direct supervision of the properly licensed engineer The purpose of the low water cut out on a steam or hot water boiler is to?? a) Add water the boiler b) Shut off the burner when low water conditions arise c) To relieve all excess pressure 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 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? P a g e 21 | 35 [Document title] [Date] a) 1 pressuretrols 2 steam gauges 3 tricks 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 What device would only be found on a steam boiler? a) 1 steam gauge 2 tricks 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 tricks 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 On a hot water boiler, what is the purpose of the vent valve? a) To make sure there is water in the boiler and to vent out any trapped air b) To provide water for washing the floor c) To vent out dirty water - Correct Answer a) to make sure there is water in the boiler and to vent out any trapped air If the safety valve or ASME safety relief valve leaks, you would? a) Reduce the pressure b) Have the valve repaired or replaced c) Tighten the spring on the valve d) Leave it alone because a small leak is ok - Correct Answer b) have the valve repaired or replaced Tricks or gauge cocks are used on a steam boiler to indicate? a) The true water level inside the boiler b) To let steam into the boiler room c) To vent out the boiler only - Correct Answer a) the true water level inside the boiler On a steam or hot water boiler, the safety valve or safety relief valve could be tested by? a) Hitting them with hammers b) By lifting the lever on the valve or raising the pressure until they operate c) Increase the temperature until they operate - Correct Answer b) by lifting the lever on the valve or raising the pressure until they operate Before starting a steam or hot water boiler you should check for? a) Water in the boiler P a g e 22 | 35 [Document title] [Date] d) A drain line is only required on an open hydroid 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 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 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 P a g e 25 | 35 [Document title] [Date] d) All of the answers mentioned are correct - Correct Answer c) a low limit temperature control Can air cause circulation problems in a hot water system? A) no b) Yes c) Sometimes d) Only if the water is cold - Correct Answer b) yes On a hot water system where would you install an air bleeder? a) At the low point in the system b) Anywhere in the system c) At the high point in the system d) Before each valve in the system - Correct Answer c) at the high point in the system What is the purpose of an isolating valve? a) To isolate the expansion tank (while a boiler is in operation) so that it can be drained b) The isolating valve shuts off the hot water boiler c) The isolating valve shut off the boiler feed water pump d) None of the answers given - Correct Answer a) to isolate the expansion tank (while a boiler is in operation) so that it can be drained 2.3 feet of water or 27 inches equals 1 pound per square inch of pressure? a) Yes b) No c) Only if the water temperature is above 212 degrees Fahrenheit d) None of the answers given - Correct Answer a) yes 2.3 x .433 = .9959 ~ 1 0.433 pounds per square inch of pressure. What would a pump performance curve chart show? a) The temperature on the suction and discharge sides of the pump 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 P a g e 26 | 35 [Document title] [Date] 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 troll 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? a) Steam traps, condensate tanks, and pumps b) Both systems need the same auxiliaries c) Strainers in recirculating pumps d) Aqua stats and recirculating pumps - Correct Answer a) steam traps, condensate tanks, and pumps After a hot water boiler has been drained, cleaned, and refilled with water, what must be done? a) Reset aqua stats b) Blow down 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 c) Pressure troll d) All 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 P a g e 27 | 35 [Document title] [Date] b) Steam c) Water - Correct Answer c) water Manometer Given an oil tank filled with #6 oil 110 feet high and 90 feet in diameter filled 70% What is the pressure of the oil in the discharge pipe at ground level? 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% How many gallons can the tank hold? a) b) c) - Correct Answer vole = 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? a) Lime and salt b) Calcium and magnesium carbonate c) Sodium bicarbonate and sodium chloride - 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 P a g e 30 | 35 [Document title] [Date] 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 feed water system, steam condenses and becomes part of the feed water. T) F) - Correct Answer F In a closed feed water system, the condensate does not mix with the feed water Heat is transferred by three means. What are they? 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 i.e. liquid or gas c) Can be measured with a thermometer - Correct Answer b) Heat of a state i.e. liquid or gas The difference in latent heat for water to steam is 970BTU's for 1lb water What is "total" heat? a) All the heat in something b) "Sensible" plus "latent" heat c) Heat that shows on a thermometer (measurable) - Correct Answer b) "sensible" plus "latent" heat 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) P a g e 31 | 35 [Document title] [Date] 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. 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 Which of the following are correct conversions of temperature? a) F = 9/5 c +32 dig = C b) C x 1.8 +32 dig = F c) C = 5/9 (F-32 dig) = F d) F -32 dig x 5/9 =C E) F -32 dig / 1.8 =C f) C x 9/5 +32 dig =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 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 P a g e 32 | 35