Boiler Safety Valves and Operating Pressure Regulations, Exams of Boiler Design and Material

Download Boiler Safety Valves and Operating Pressure Regulations and more Exams Boiler Design and Material in PDF only on Docsity! MN Boiler License 25 8 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 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 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 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 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 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% 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 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 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 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 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 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? 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 bop? 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? 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 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 bop b) 500 bop c) 300 bop - Correct Answer c) 300 bop 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 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? 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? 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? a) Low limit controls are not used on hot water boilers b) This control will not allow the burner to leave its low fire position until the temperature in the boiler has passed 150 degrees c) A low limit control will decrease the pressure on the system - Correct Answer b) this control will not allow the burner to leave its low fire position until the temperature in the boiler has passed 150 degrees If you passed a state boiler exam for 1st class, grade c engineer, what equipment would your license allow you to operate? a) Total horsepower of 250 psi b) boilers up to 500 hip and hot water boilers not to exceed 250 degrees F or 160 psi steam boilers not to exceed 15 psi c) Hot water boilers above 250 f or 160 psi and steam boilers above 15 pies - Correct Answer b) boilers up to 500 hip and hot water boilers not to exceed 250 degrees F or 160 psi steam boilers not to exceed 15 psi Would a safety relief valve installed on a hot water boiler relieve all the pressure if the boiler was low open water and the water was flashing into steam? a) Yes 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 hip not to exceed 250 degrees F or 160 psi hot water and 15 psi steam b) Boilers of unlimited hip and above 250 degrees F or 160 psi hot water and at 15psi steam pressure. c) Boilers of unlimited hip above 15 psi, but below 250 degrees F or 160 psi hot water. - Correct Answer a) boilers of unlimited hip 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 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 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 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 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 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 aqua stat is used on a? A) hot water boiler b) Steam boiler only c) Both types of boilers - Correct Answer a) hot water boiler An aqua stat is a device used in hydroid heating systems for controlling water temperature. To prevent the boiler from firing too often, aqua stats 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? 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 b) To drain water from the boiler c) To protect the steam gauge from too high of a temperature - Correct Answer c) to protect the steam gauge from too high of a temperature What is one reason causing the expansion tank to fill with water? a) Too high of pressure b) Air leaks out by the gauge glass fittings c) Too high of a temperature - Correct Answer b) air leaks out by the gauge glass fittings What would you do if you came into the boiler room and found no water in the boiler, regardless if it's a steam or hot water boiler? a) Add water to the boiler b) Lift the safety valve on the boiler C shut off the burner and allow the boiler to cool - Correct Answer c shut off the burner and allow the boiler to cool Referring to the previous question, the most dangerous action a boiler operator can take when a dangerously low water condition exists is? a) Add water to the boiler b) Increase the pressure on the boiler c) Shut down the boiler - Correct Answer a) add water to the boiler What is the purpose of the bottom blow down on a steam boiler? a) To check the steam gauge b) To remove sludge and sentiment and to drain the boiler c) None of the answers given - Correct Answer b) to remove sludge and sentiment and to drain the boiler 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 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 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 d) None of the answers given - Correct Answer c) gauge cocks and tri cocks When blowing down the water column or gauge glass, the water in the glass should blank return to normal when the valves are closed? a) Slowly b) Quickly c) Does not make any difference d) None of the above answers - Correct Answer b) quickly If the water in the boiler is below the bottom tri cock can water be safely added to the boiler? A) no b) Only if the pressure is above 15 PSIG c) Yes if water flows continuously from the gauge glass drain line 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 magnetron 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 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? 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 monoxide) the combustion is? a) Complete b) Theoretical c) Incomplete - Correct Answer c) incomplete What percentage of oxygen by volume is air (round numbers)? a) 21% b) 14% c) 79% - Correct Answer a) 21% By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.039% carbon dioxide, and small amounts of other gases. The scale of a draft gauge is measured by inches of? a) Mercury 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. 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 b) ASME stands for American Society of Mechanical Engineers, enforces Boiler and pressure vessel construction and maintenance c) ASME stands for American Society of Mechanical Engineers and gives codes for boiler and pressure vessel construction/maintenance - Correct Answer c) ASME stands for American 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 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 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 blow down on a safety valve? a) Blow down, 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 pressure of a pressure relief valve and reseating pressure expressed as a percentage c) Blowback or Blow down 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? a) Higher b) At c) Below - Correct Answer c) below Superheated valves should be set at least 5psi lower than drum valves How are super heaters 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 superheated 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 answer b) There is a drain after superheated and before the main steam line Super-heater vents are opened before firing a boiler To a) Allow the superheated to warm up quicker b) Let the first steam produced act as a superheated 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 superheated 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 Superheated safety valves must be set ( ) the safety valves on the steam drum? a) Above b) At c) Below - Correct Answer c) Below Superheated safety valves must relieve at least what percentage of the steam level? a) 100 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 ? a) b) c) - Correct Answer ? a) b) c) - Correct Answer ? a) b) Wilburfogg c) - Correct Answer