Stationary Engineer Test Exam Questions With 100% Correct Answers 2024, Exams of Engineering

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Stationary Engineer Test Exam Questions With 100% Correct Answers 2024 When designing a boiler, special consideration must be given to heat transmission - Correct Answer-Radiation, conduction, and convection Which type of heat transfer takes place by actual physical contact, from molecule to molecule, without displacing the molecules? - Correct Answer-Conduction Which type of boiler is the most economical to build? - Correct Answer-Firetube A boiler is an industrial boiler when - Correct Answer-The steam generated is used for a process Which is true about an industrial boiler as compared to a utility boiler? - Correct Answer-Idustrial boilers operate at lower pressures and temperatures pg. 1 professoraxe l Utility boilers are used primarily to produce - Correct Answer- High pressure steam to drive turbines that make electricity Which of the following is NOT a type of fire tube boiler? - Correct Answer-Stirling Which of the following is an example of a cogeneration system? - Correct Answer-Exhaust gases from a combustion turbine driven generator are used to make steam in a boiler for a secondary purpose If the tubes in a boiler are expanded during installation, which of the following will be true? - Correct Answer-The ID is increased When a new tube is installed in a firetube boiler, which of the following happens to the tube? - Correct Answer-The tube is lengthened What is the MINIMUM size of an elliptical manhole on a boiler? - Correct Answer-11" x 15" pg. 2 professoraxe l This refers to: - Correct Answer-lb/hr capacity of the safety valve When an accumulation test is performed, the boiler is fired at: - Correct Answer-maximum firing rate with main steam stop valve closed You have a safety valve set on a 50 psi boiler system. What is the maximum pressure that may be developed during safety valve blowdown? - Correct Answer-53 psi Oils and solids accumulating on the water surface in the boiler can lead to what condition? - Correct Answer-Foaming If the water in a boiler is foaming, the water level indication in the gauge glass will be - Correct Answer-erratic If you have a priming condition, the sight glass will read - Correct Answer-high pg. 5 professoraxe l A boiler has carried a large slug of water over into the steam. This condition is called - Correct Answer-priming How do steam separators work? - Correct Answer-they cause a sudden change in direction that throws water out On a pressure gauge, what is the minimum size piping that can be used? - Correct Answer-1/4" if copper or brass pipe 1/2" if steel Which statement is true about steel pipe when used on a boiler? - Correct Answer-May not be less than 1/2" When may copper tubing NOT be used for steam service? - Correct Answer-when the temp exceeds 406 degrees/250psi Cast iron or ductile iron pipe is used for - Correct Answer- underground water supply and drainage pg. 6 professoraxe l For every 100 feet of steam header piping, you lose how much pressure? - Correct Answer-2-3 psi What is the allowable pressure drop in a 100 psi steam line? - Correct Answer-2-3 psi What common type of expansion joint is used universally throughout a steam distribution system? - Correct Answer-U-bend A difference between a check valve and a non-return valve is: - Correct Answer-A non return valve acts as a cushioning valve that helps prevent chattering In a low pressure heating system. which type of steam trap is most commonly used? - Correct Answer-A thermostatic steam trap Which type of steam trap contains a piston and a valve? - Correct Answer-an impulse trap pg. 7 professoraxe l What type of feedwater regulating system may use a steam flow sensing element? - Correct Answer-Thermostatic expansion tubes When using a pneumatic feedwater regulating system with a remote manual / automatic selector, how may the control lines be checked for leakage? - Correct Answer-set the control on reset Which type of feedwater regulator is best for a boiler that has wide pressure and load swings? - Correct Answer-Three element feedwater regulator How often should the makeup water feeder in a low pressure boiler system be blown down? - Correct Answer-Once per week A strainer protects the automatic makeup water feeder from scale and lime pg. 10 professoraxe l deposits. This strainer should be cleaned at least once __ ' - Correct Answer-a month or more if the build up of deposits require it Which is true about a makeup water feeder on a low pressure boiler system? - Correct Answer-Using cold city water makeup can lower overall boiler effciiency How often should a low water fuel cutoff be inspected internally? - Correct Answer-annually Which of the following best describes the principle of operation of a centrifugal pump? - Correct Answer-uses kinetic energy to move liquid by means of a rotating impeller and circular pump casing A centrifugal turbine pump is characterized by its - Correct Answer-diffusion rings A centrifugal pump's performance and long life are dependent on - Correct Answer-wear rings seal and thrust imposed pg. 11 professoraxe l The energy needed to fill the suction side of a centrifugal pump and overcome friction and flow losses is referred to as __ head. - Correct Answer-Net positive suction If you decrease the height of your feedwater tank, what may it cause your feedwater pumps to do? - Correct Answer-Cavitate On a pump that must draw its suction from below, what is the biggest limitation? - Correct Answer-atmospheric pressure and water temperature A lubrication with a low viscosity is usually - Correct Answer- Adapted to high rpm use Lube oil should have one of the following properties - Correct Answer-should not give off volatile vapors at 325 to 350 degrees A type of pump that uses the velocity of steam against a mass of water is a: - Correct Answer-Injector pg. 12 professoraxe l concentration maintained in the water. This can cause what condition? - Correct Answer-caustic embrittlement What condition could be prevented by keeping the pH of water greater than 7? - Correct Answer-Corrosion To raise the pH of boiler water, what should be added to the chemical treatment? - Correct Answer-Caustic soda What condition caused by improper water treatment may be remedied by maintaining proper alkalinity? - Correct Answer-foaming/carryover What is used for alkalinity control in boilers? - Correct Answer-sodium sulfite Which test is used to measure hardness? - Correct Answer- soap test Which water test uses a color comparison test? - Correct Answer-Phosphate pg. 15 professoraxe l What phosphate residual should be carried in the boiler water? - Correct Answer-40 ppm or less What is the maximum recommended concentration of calcium chloride in the boiler if the boiler feedwater normally averages 6 ppm of calcium chloride? - Correct Answer-60 ppm List one thing that a bottom blowdown does NOT do - Correct Answer-Help a low water problem When no boiler water analysis is made, what is the recommended frequency of boiler blowdown per the ASME Code? - Correct Answer-every 24 hrs When must a boiler have two bottom blowdown valves? - Correct Answer-if the pressure is greater than 100psi What is the MAXIMUM pressure for which a seatless-type blowdown valve is pg. 16 professoraxe l used? - Correct Answer-450 psi Where does water leave the blowdown tank - Correct Answer- the bottom What system is directly piped into your boiler flash tank? - Correct Answer-Continious blowdown If you lay up a boiler for a short time, what concentration of caustic soda should be maintained in the boiler water? - Correct Answer-400 ppm When laying up a boiler for a long period of time, trays of what material are placed inside the boiler? - Correct Answer-quick lime, hydrated lime what is the purpose of silica gel - Correct Answer-absorb moisture during boiler dry lay up When laying up a boiler in a dry state, which of the following is NOT used as a desiccant? - Correct Answer-caustic soda pg. 17 professoraxe l What grade of fuel oil may be ignited by an electric spark from electrodes powered by an ignition transformer? - Correct Answer-#2 Which fuel oil burner design uses oil at a pressure of 100 psi. or higher? - Correct Answer-plug and tip pressure atomizing type How often should the oil burner be cleaned on a high pressure boiler when firing heavy oils? - Correct Answer-Once per shift When banking a fuel oil-fired boiler, which would you do? - Correct Answer-shut off the fd fan What controls the flow of natural gas to the gas burner so as to ensure the proper combustion rate? - Correct Answer-Pressure regulator What is another name for a low gas pressure switch? - Correct Answer-vaporstat pg. 20 professoraxe l what shuts off the gas to a burner on low gas pressure - Correct Answer-a vaporstat What is the percentage of excess air needed for complete combustion when using a fuel oil burner? - Correct Answer-3-15% What is the primary function of a microcomputer burner control system MBCS? - Correct Answer-controlling combustion safety What is the average purge time for a high pressure boiler? - Correct Answer-30 to 60 seconds What should be the minimum air flow during the pre-purge of a gas- or oil-fired boiler? - Correct Answer-25% of the full-load air flow An infrared sensor uses what type of scanning device to detect a flame? - Correct Answer-lead sulfide cell pg. 21 professoraxe l How quickly must a flame detector in an industrial boiler detect loss of flame? - Correct Answer-within 4 seconds When lighting a low pressure gas burner on a low pressure boiler, what is the last step? - Correct Answer-Lift the manual reset valve The primary difference between a high-pressure gas burner and a low-pressure gas burner is - Correct Answer-the location of where the air and fuel are mixed What is the pressure on a low-pressure gas burner? - Correct Answer-0 psi All of the following are types of modern automatic combustion control systems EXCEPT: - Correct Answer-regulating What type of automatic combustion control is actuated by the steam pressure and pg. 22 professoraxe l entrained in the flue gas flow? - Correct Answer-radial straight What limits the amount of coal that may be burned per square foot of grate surface? - Correct Answer-the amount of combustion air that may be delivered by the fd fan All the following are used to measure the quantity of combustion air flow EXCEPT: - Correct Answer-rotometer During normal boiler operation, all of the following are means the operator can use to determine relative air quantity delivered to the furnace EXCEPT: - Correct Answer-venturi flow meter When using soot blowers, what is the draft condition? - Correct Answer--.10 to -.15 inches of water On a balanced draft boiler installation equipped with interlocks, what should happen if you suddenly lose ID fan? - Correct Answer-fd fan shuts off and fuel feed shuts off pg. 25 professoraxe l What is the temperature limit for preheated air when operating a stoker-fired boiler? - Correct Answer-350 To keep an electrostatic precipitator working effectively you should - Correct Answer-have a good rapping system How is the maintenance of an electrostatic precipitator best kept to a minimum? - Correct Answer-Maintaining flue gas temp in the precipitator above the acid dew point What advantage does a filter baghouse have over an electrostatic precipitator in its operation? - Correct Answer-the sulfur content of the ash does not affect the collection efficiency what is used to keep the SO2 down - Correct Answer-wet and dry scrubbers A wet scrubber that has been maintained properly has the capability of absorbing pg. 26 professoraxe l __ % of the 502 in the flue gas. - Correct Answer-90% The efficiency of a spray pond or cooling tower is based on? - Correct Answer-wet bulb temp or relative humidity of the ambient air When placing an induced draft cooling tower into service, which is the last step performed? - Correct Answer-start the 1.0. fans When operating an induced draft cooling tower, which of the following statements is FALSE? - Correct Answer-it is more economical to operate one fan at high speed then two fans at low speed Which chemical is often used to control algae accumulation in cooling towers? - Correct Answer-copper sulfate How long may the operator be away from the boiler? - Correct Answer-the time it takes to go from 1/2 sight glass of water to no water showing pg. 27 professoraxe l Bad washers in a low pressure boiler's gauge glass - Correct Answer-Can cause a false water level reading in the gauge glass What can you do to find the water level if the gauge glass is broken? - Correct Answer-open the tri cocks individually Which of the following is NOT done during a boiler startup? - Correct Answer-fill the boiler to the nowl If a priming situation occurs, what should you do? - Correct Answer-Reduce the firing rate and blow the boiler down to gain control of the water level If the boiler is priming so badly that you cannot see the water level, what action should be taken? - Correct Answer-close the main steam stop long enough to determine the water level The water level in a steam boiler has been proven to be low. What step should be taken first? - Correct Answer-stop the air and fuel supplies pg. 30 professoraxe l If you have a boiler tube leak, what is your primary concern? - Correct Answer-Cutting other tubes in the boiler If a watertube boiler experiences a tube rupture, which actions should be taken? - Correct Answer-stop the fuel and shut down the boiler immediately If you have a fire in a pulverizer, what action should be taken? - Correct Answer-reduce the air supply to the pulverizer What should be done before relighting a pulverized coal-fired boiler after a flame failure? - Correct Answer-regulate the air flow to 10% and wait 5 minutes What condition does graphitization cause in boiler steel? - Correct Answer-makes the steel weaker Which of the following is slow deformation of metal over time under continual stress and high temperature? - Correct Answer-Creep pg. 31 professoraxe l Which of the following is a protrusion on a tube? - Correct Answer-bag What is blistering of boiler metal? - Correct Answer- separation of metal into layers Which statement is true about welding performed on boilers? - Correct Answer-all welding on a boiler must meet ASME code and must be approved by an authorized inspector prior to repairs being made What is the minimum sq ft of heating surface at which you must have a license to operate the boiler? - Correct Answer-360 sq ft What must you do if your boiler license is still valid and you lose it? - Correct Answer-submit an affidavit stating the circumstance give a reason why the state cannot take away your boiler operating license - Correct Answer-poor health pg. 32 professoraxe l Considering the limitation on materials of construction of a steam turbine, what is the maximum temperature of steam that may be used? - Correct Answer-1050 F What type of steam turbine has steam take-ofts prior to going to the condenser? - Correct Answer-extraction If extraction steam from a turbine is used in a feedwater heater, what kind of steam is it? - Correct Answer-superheated steam If a turbine is on turning gear and heat is being generated in the bearings, at what temperature should you add cooling water to the bearings? - Correct Answer-110 to 120 degrees What is the proper temperature for turbine bearings? - Correct Answer-140 to 150 degrees What is the maximum acceptable level of dissolved solids in the steam being pg. 35 professoraxe l supplied to a steam turbine? - Correct Answer-0.1 ppm When a steam turbine is operated condensing, what type valve is placed between the condenser and the turbine? - Correct Answer-Atmospheric relief valve When a steam turbine is to be shut down, what step should be taken first? - Correct Answer-Gradually reduce the load to zero What is the pressure above which the exhaust side of a steam turbine and the connected piping may be protected by either a safety valve or rupture disc or a combination of the two? - Correct Answer-15psig What is the most economical way to partially load a small steam turbine? - Correct Answer-use the minimum number of hand controlled steam nozzles feasible pg. 36 professoraxe l Of the following locations, where must a drain valve be installed? - Correct Answer-between the main steam line and the turbine throttle valve Which of the following would cause vibrations in a turbine? - Correct Answer-improper air gap in the generator The proper procedure for cleaning a turbine oil cooler is: - Correct Answer-Place the entire tube bundle into cleaning tank pg. 37 professoraxe l