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Ohio stationary steam engineer exam questions and answers, Exams of Engineering

Ohio stationary steam engineer exam questions and answers

Typology: Exams

2024/2025

Available from 01/21/2025

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Ohio stationary steam engineer exam

questions and answers

Combustion efficiency may be increased by_____ the primary air - Answer- Preheating What is the purpose of cinder reinjection? - Answer- increase efficiency 2 forces of equal intensity acting in opposite directions is? - Answer- tension What is true about the dew poimt of flue gasses - Answer- dew point is the temp at which the gasses will condense What will not cause high stack temps? - Answer- plugged dry pipe What is true about smoke - Answer- smoke consists of unburned hydrocarbons WHat is used to reduce SO2 emissions in coal fired boilers? - Answer- Wet or dry scrubbers In a solid fuel fired boiler, a gradual increase in flue gas exit temps over a course of a shift inidicates the boiler operator needs to _______ - Answer- operate soot blowers What watertube bolier is the largest in size and steam-generating compacitity - Answer- Utility watertube boiler the blowdown on a safety valve can be altered by changing the setting of the _____ - Answer- huddling ring Copper and brass piping may be used for piping systems as long as the temp does not exceed - Answer- 406 degrees What is not measured in a 3 element feedwater system -feedwater flow -drum pressure -steam flow -drum level - Answer- drum pressure If the flame in a gas-fired bolier is pulsating how can the problem be fixed? - Answer- increase furnace draft

Grindability of coal is an issue to be considered when operating which kid of coal- burining equipment? - Answer- ball-and-race pulvarizer When using an induced draft fan, where will the strongest negative draft be found - Answer- at the inlet of the ID fan How do you bank a fuel oil-fired boiler? - Answer- turn off the fuel and air supplies, the re-light the burner as necessary to maintain a predetermined minimum steam pressure What is true about the lube oil used in a steam turbine - Answer- it must readily seperate oil and water What supplies the oil to a large steam turbine during start-up - Answer- aux oil pump What device prevents the over-travel of the governor linkage that might be caused by the weight of the governor components - Answer- Dashpot When taking a boiler out of service what should you not do - Answer- close the vent what type of turbine oil purification system periodically removes a potion of the oil and replaces it with fresh oil? - Answer- makeup oil system what type of steam turbine system has steam take-offs prior to going into the condenser? - Answer- extraction turbine 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 a rupture disc, or a combination of the 2 - Answer- 15 psi What grade fuel oil may be ignited by an electric spark from electrodes powered by an ignition transformer? - Answer- # what is the cheapest, easiest form of water treatment? - Answer- heating the water A turbine exhausts steam @ 15 psi. This steam is used in a low-pressure application such as a deareator. this type of turbine is called a: - Answer- back-pressure turbine At what temp should you add cooling water to a turbines bearings? - Answer- 110- degrees What is produced from the reaction between sodium sulfite and oxygen? - Answer- sodium sulfate What is the purpose of an attemperator - Answer- reduce temp of superheated steam by adding a water mist

What are the 2 main methods by which steam is prevented from leaking out around the turbine shaft where the shaft exits the casing? - Answer- labyrinth seals and carbon rings If the water in a boiler is foaming, the water level indication in the gauge glass will be: - Answer- erratic Cast iron or ductile iron pipe is used for: - Answer- underground water supply and drainage What is the maximum allowable level of dissolved solids in the steam being supplied to a steam turbine? - Answer- .1 ppm If a boiler requires a second safety valve, the highest pressure setting on the additional valve should not exceed the MAWP by more than - Answer- 3% Steam is tapped off a turbine casing at several pressures for aux. uses in the production plant. the steam is called: - Answer- extraction steam If the tubes in a boiler are flared during installation, which of the following is true? -The ID is increased -The OD is decreased -The length is decreased -the wall thickness is increased - Answer- The ID is increased What problem is caused by dirty condenser tubes? - Answer- inability to maintain a normal vacuum on condenser A lubrication with low viscosity is usually: - Answer- adapted to high RPM use On a bicolor gauge glass water will appear ____ and steam will appear _____ - Answer- green, red Name 2 common classes of steam turbine blading: - Answer- impulsive and reactive Which of the following is NOT an advantage of operating a steam turbine condensing? -the condensate from the steam in recovered -the HP developed by the turbine is increased -The speed of the turbine is decreased -Recovery of hot condensate increases boiler efficiency - Answer- The speed of the turbine is decreased A boiler is industrial when: - Answer- The steam is used for a manufacturing process

What is the function of the dashpot? - Answer- prevent over-travel due to the weight of the governor linkage Which of the following is part of the weekly preventitive maintenance program for a steam turbine? -Test the overspeed trip -inspect turbine exterior -change oil -Lubricate the throttle valve - Answer- Inspect exterior What oil pressure should be maintained when using a turbine oil pump with a relief valve - Answer- 50-55 PSI What is the first step when starting a steam turbine? - Answer- Open the condensate drains An impulse turbine utilizes one row of stationary nozzles which increase the velocity of the steam enough to drive 2 rows of rotating blades. This type of turbine is called a: - Answer- Velocity-compound turbine What should be part of the monthly preventive maintenance program for a steam turbine? - Answer- Check oil reservoir for sludge or water What is the purpose of the aux. oil pump in a steam turbine installation? - Answer- Provide oil to the bearings on start-up During the start-up of a large steam turbine, the speed is gradually increased so that the operating speed may be reached. The turbine operates smoothly, but at a particular RPM range, a significant vibration is encountered. What should the operator do? - Answer- Increase the speed to get through the RPM range as quickly as possible A steam turbine operates at 4500 RM. At what speed should the trip be set? - Answer- 4950 (10% over normal operation speed) All of the following are causes of vibration in a turbine EXCEPT: -priming from boiler -misalignment of the turbine shaft -condenser cooling water too warm -passing through critical speed - Answer- condenser cooling water too warm What device removes air and other non-condensable gases from a surface condenser - Answer- steam jet air ejector Upon inspection of the rotor in a large steam turbine, it shows crusty mineral accumulations on the blading. This would likely be due to: - Answer- boiler carry-over

The turbine shaft is also known as the: - Answer- spindle What type of steam turbine is most likely to utilize reheat? - Answer- compound turbine Set pressure on safety valve on a boiler when only one valve is used should be set: - Answer- at or below MAWP Set pressure on safety valve on a boiler when 2 or more valves are used should be set:

  • Answer- on the first: set at or below MAWP Highest one: no more than 3% over MAWP Blowdown (blowback) of a safety valve should not be less than ____psi in any case - Answer- 2psi Blowdown (blowback) of a safety valve should not be more than ____% in any case - Answer- 4% For safety valves set to pop at 100-300 psi blowdown must not be less than ____% of popping preassur - Answer- 2% The capacity of a safety valve must be able to pass enough steam so that pressure in the boiler cannot rise to more than ____% above the MAWP - Answer- 6% What is the purpose of magnetic particle testing? - Answer- Expose surface and near- surface flaws in ferrous metals What grade fuel oil may be ignited by an electric spark - Answer- # What is true about an industrial boiler as compared to a utility boiler? -Industrial boilers are normally used to for electrical generation -Industrial boilers operate at lower pressures and temps -Indistrial boilers often operate at pressures greater than 1800 psi -industrial boilers do no produce superheated steam - Answer- Industrial boilers operate at lower pressures and temps How long can a boiler operator be away from the boiler? - Answer- the time it takes to go from 1/2 a gauge glass to the low water cutoff point with no water entering the boiler A difference between a check valve and a non-return valve is: - Answer- a non-return valve acts as a "cushioning" valve that helps prevent chattering What will be the water level indication in the gauge glass if the boiler water is foaming severely? - Answer- bouncing erradically What advantage does a filter baghouse have over an electrostatic precipitator in its operation? - Answer- the sulfur content does not effect efficiency

If a closed feedwater heater is functioning properly, what should the temp of the feedwater as it exits the heater - Answer- 2-5 degrees below the temp of the steam supplied to the heater When starting a fire in a coal-fired boiler with chain grates, how much coal should be on the grates? - Answer- 3-4 inches When must your boilers operators license be renewed? - Answer- not later than the expiration date on the license What is the maximum recommended concentration of calcium chloride in the boiler if the boiler feedwater normally averages 6 ppm? - Answer- 60 ppm (10x's) What is the pressure on a low pressure gas burner? - Answer- 0 psi When testing a safety valve manually on a low-pressure boiler, how long do you hold it open? - Answer- 5-10 seconds Where does the water leave a blowdown tank? - Answer- the bottom Which fan blade design is best for preventing corrosion due to flyash particles entrained in the flue gas flow? - Answer- radial straight Which chemical is often used to control algae accumulation in cooling towers? - Answer- copper sulfate Where must your boiler operators license be kept? - Answer- in a conspicuous place in the boiler or turbine room When no boiler water analysis is made, what is the recommended frequency of boiler blowdown per ASME code - Answer- every 24 hours If scale has accumulated inside tubes of a watertube boiler, it is best removed by: - Answer- an air-driven turbine tube cleaner Which of the following combinations are needed to assure complete combustion of the fuel in a boiler furnace? -CO2,O2,CO, and excess air -Mixture,atomization,time, and temp -time, tmep, and O -feedwater,fuel, steam, and draft - Answer- mixture,atomization, time, and temp What is heated in an economizer - Answer- feedwater

If the water in a boiler is found to be dangerously low, what action should be taken? - Answer- secure fires and manually isolate the feedwater A flame scanner containing a lead sulfide cell is sensitive to - Answer- Infrared radiation When may a bottom blow down line be as small as 3/4"? - Answer- if the boiler has fewer than 100 sqft of heating surface A sudden increase in the temp of the flue gases entering the stack from the breeching would likely indicate: - Answer- a broken flue gas baffle What is a superheater vent used for? - Answer- establish flow through the superheater Which of the following will help prevent furnace explosion? -Ensuring a safe boiler water level at all times -Setting the vaporstat to the highest allowable pressure setting -Maintaining safety valves in good condition -Purging the furnace after flame failure - Answer- Purging the furnace after flame failure Boilers laid up dry, have what material placed inside to absorb moisture? - Answer- Quicklime or silica gel What condition is caused by the presence of oxygen in the boiler? - Answer- pitting For what is the ringlemann test used? - Answer- measure smoke density leaving the stack If a flame failure occurs, how much time may pass before the flame scanner detects the loss of flame and causes a boiler S/D - Answer- 4 seconds Under what condition is it common for a combustion air preheater to be bypassed? - Answer- whe the boiler is being started, or operating under a light load A therm of natural gas is_____ - Answer- 100,000 BTU reguarless of the exact volume How are the tubes usually secured in the construction of a firetube boiler? - Answer- expanded with a madrel and then beaded What is used to heat feedwater passing through an economizer? - Answer- gasses of combustion exiting the boiler What type of pump is generally used for delivering chemical treatment solutions into a steam boiler - Answer- metering pump What is the flash point of fuel oil - Answer- The lowest temp at which fuel produces enough vapors to cause flash of flame when exposed to an ignition source

When performing an evaportaion test on a low water fuel cutoff control, which of the following must be done by the operator? -Slowly close the non-return valve until the safety valve discharges -drain the float chamber on the low water fuel cutoff control S/D and cool the boiler before performing the test -secure the feedwater going to the boiler - Answer- -secure the feedwater going to the boiler What is measured to determine how much excess air is being used for combustion? - Answer- the % of O2 in the flue gases What change in steam pressure in the boiler occurs when the bottom blowdown valves are opened? - Answer- there is no change What is commonly used to increase the quality of the steam leaving the boiler? - Answer- dry pipe What vale presents the least resistance to flow of steam? - Answer- gate valve What is true about #6 fuel oil? - Answer- it must be preheated in order to burn well What is the greatest energy loss in the operation of a steam boiler? - Answer- heat lost up the stack to atmosphere To raise the pH of boiler water, what should be added to the chemical treatment? - Answer- caustic soda In a low pressure heating system, which type of steam trap is most commonly used? - Answer- thermostatic steam trap What type of feedwater regulator is best for a boiler that has a wide pressure and load swings? - Answer- 3 element In which form of heat transfer does heat travel from molecule to molecule without displacing the molecules? - Answer- conduction what condition does graphitization cause in boiler steel? - Answer- makes steel weaker What is true about the operation of an overfeed stoker? - Answer- coal is fed from above the grates a centrifugal pumps performance and long life depend on: - Answer- wear rings and thrust imposed

What should be done before relighting a pulverized coal-fired boiler after flame failure? - Answer- wait 5 minutes and regulate air flow to 10% adding water to increase combustion in a coal fired boiler is called: - Answer- tempering What is used for alkalinity control in boilers? - Answer- sodium sulfite What should the minimum air flow be during pre-purge of a gas or oil fired boiler - Answer- 25% of the full-load air flow What type of boiler is the most economical to build - Answer- fire tube How often should a strainer on a makeup water line be changes - Answer- once a month or more if the build up of deposits require it If you have a boiler tube leak in a watertube boiler, what is your primary concern? - Answer- cutting other tubes in the boiler If the boiler is priming so badly that you cannot see the water level, what should be done? - Answer- close the main steam stop valve long enough to determine water level Which statement is true about flues in firetube boilers -greater than 4" id -Greater than 4" OD -smaller than 6" OD -smaller than 12" OD - Answer- greater than 4" ID At what temp does a fusible plug melt? - Answer- 450 degrees What represents the performance of industrial boilers? - Answer- steam generation greater than 5000#/hr at 200 psi When boiler metal deforms over a long period of time under high temp and continual stress, this is called: - Answer- creep what is the minimum size of an elliptical manhole - Answer- 11"x15" What problem may be caused by serious leaks in washers around tubular gauge glass?

  • Answer- false water level reading What advantage is offered by a centrifugal boiler feedwater pump over other types? - Answer- steadier flow produced Diffusion rings are found in: - Answer- turbine style centrifugal pumps

The energy needed to fill the suction side of a centrifugal pump and overcome friction and flow losses is referred to as _______ head - Answer- net positive suction What determines the frequency of ash removal in a boiler with dumping grates - Answer- fuel bed thickness What is key to attaining smokeless combustion? - Answer- burning all combustable material before soot particles can be formed What device controls the flow rate of natural gas as to ensure the correct combustion rate? - Answer- gas pressure regulator To keep the electrostatic precipitator working properly, you should - Answer- maintain the rapping system in good condition In a boiler plant that is continually attended, that standard is to blowdown the water column: - Answer- once per shift The bottom blowdown system will provide the best results when: - Answer- the boiler is operating at low load Which statement is true about a high-pressure boiler's safety valves? -Both steam drum valves should open simultaneously -The super heater safety valve should open before the steam drum safety valves -one steam drum safety valve should open, then the superheater safety valve, the the other drum safety -the superheater safety valve should be of adequate capacity so that the drum safety valves never oper - Answer- -The super heater safety valve should open before the steam drum safety valve how may the frequency of bottom blowdown valve use be determined? - Answer- the blowdown should be operated as much as needed according to the boiler water analysis Fuel oil with low flash point is: - Answer- more hazardous than fuel oil with high flash point What is true about a closed feedwater heater? - Answer- steam and water do not come in direct contact Water hammer is caused by - Answer- failure to drain condensate from piping For what purpose are manometers? - Answer- measuring flue gas and combustion air pressures

Which device controls the operating pressure range of a package steam boiler? - Answer- operating limit pressure control What is a moajor cause of air pollution emitted by burning coal or heavy fuel oil? - Answer- sulfur dioxide The pour point of fuel is - Answer- the lowest temp at which oil will flow When an economizer is used to produce a 10 degree increase in feedwater temp, what is true about the fuel savings? - Answer- a savings of 1% is achieved The volatile matter in coal may be burned more efficiently when - Answer- overfired air is used Where is the ID fan located? - Answer- between the boiler and the stack Before dumping a boiler, which conditon should be met? - Answer- the boiler metal should be cool enough to touch contunually The exterior surfaces of tubes in a firetube boiler are kept clean by - Answer- proper feedwater treatment When manually testing a safety valve _____ - Answer- the test lever is pulled by hand and then released to allow the valve to snap closed What is used to keep the surfaces of watertube boilers clean - Answer- soot-blowers What should blow out of the upper try cock - Answer- pure steam Ion-exchange water softners help prevent - Answer- scale What will happen if the boiler operator closes the top gauge glass isolation valve? - Answer- the water level will rise and fill the glass When is a non-return valve not needed? - Answer- if a plant has only one boiler What is the order of feedwater valves between the pump and the boiler - Answer- feedwater pump, check valve, stop valve, check valve, stop valve boiler The quick drain test of the low water cutoff control should be tested at what frequency? - Answer- daily What parts make up the heating surface of a scotch-marine boiler? - Answer- the flue and tubes A boiler is an industrial boiler when - Answer- the steam generated is used for process

Utility boilers are used primarily to produce: - Answer- High-pressure steam to drive turbines to generate eectricity Which of the following is not a type of firetube boiler? -Stirling -Scotch marine -Firebox -HRT - Answer- Stirling When a tube is installed in a firetube boiler, which of the following happens to the tube -The OD is decreased -The ID is decreased -The tube is lengthened -The tube wall is thickened - Answer- The tube is lengthened What is the minimum water temp to be used in a hydrostatic test? - Answer- 70 degrees How many sq ft of heating surface is required to produce 1 horsepower in a HRT firetube boiler? - Answer- 12 sq ft How many sq ft of heating surface to produce 1 boiler HP in a vertical firetube boiler - Answer- 14 sqft How many sq ft of heating surface to produce 1 boiler HP in a watertube boiler - Answer- 10 sqft If a high pressure boiler is at its highest operating pressure below MAWP where will the pointer on the pressure gauge be? - Answer- at 12 o'clock A gauge that reads higher than actual boiler pressure is called a: - Answer- fast gauge What is true about a boiler pressure mercury switch - Answer- mercury switch must be installed with pigtail siphon vertically On a LP boiler cut out equals: - Answer- cut in plus differential On a LP boiler, the pressure switch is installed: - Answer- vertical with the high point up What is the maximum blowback on a safety valve that is set for 100 psig? - Answer- 4 psi What is the minimum blowback of a safety valve that pops at 250 psi? - Answer- 5 psi When an accumulation test is perfomed the boiler is fired at: - Answer- max firing rate with the main steam stop valve closed

oils and solid accumulating on water surface in a boiler can lead to: - Answer- foaming A boiler has carried a large slug of water over into steam. This condition is called: - Answer- priming How do steam seperators work? - 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? - Answer- 1/4" if copper 1/2" if steel When may copper tubing not be used? - Answer- over 406 degrees What common type of expansion joint is used universally throughout a steam distribution system? - Answer- U-bend What type of steam trap contains a piston and a valve? - Answer- an impulse trap For maximum efficiency what is true about superheated steam? - Answer- a constant superheated steam temp is desirable A superheater safety valve relieves how much of the total steam produced by the boiler? - Answer- 20% What is the purpose of a water screen? - Answer- prevent slagging What is required if the boiler pressure is greater than or equal to 400 psig? - Answer- 2 direct reading mechanical gauge glasses or one gauge glass and 2 remote level indications If you close the bottom blowdown valve on the water column and water fills up quickly to the center of the gauge glass, this is an indication that - Answer- the water column piping is free of scale and sludge What might you find attached to the boilers water column? - Answer- a feedwater regulating device What type of feedwater regulator is equipped with a fuel shut off? - Answer- float type When water is added to a boiler, what will occur initially? - Answer- the water level will drop What are you measuring in a 3 element control system? - Answer- feedwater flow, steam flow, drum level

What type of regulator is best for a boiler with wide pressure and load swings? - Answer- 3 element When using a 3 element feedwater regulating system, which is the analog input? - Answer- drum level How often should a makeup feedwater regulating system in a LP boiler be blown down?

  • Answer- once per week A centrifugal pump is characterized by its: - Answer- diffusion rings When starting a centrifugal pump the valve should be set with the - Answer- suction open, discharge closed Lube oils should not give off volatile vapors at: - Answer- 325-350 degrees A type of pump that uses the velocity of steam against a mass of water is a : - Answer- injector Calcium and magnesium are removed by what external water treatment process that can be regenerated using sodium chloride? - Answer- zeolite softener What is the best way to get good water treatment results? - Answer- combination of internal and external treatment How can temporary hardness be removed from water? -By heating water -By softening the water -by treating the water with sodium sulfite either 1 or 2 - Answer- either 1 or 2 What pH value shows alkalinity? - Answer- 9 A boiler has been under stress for an extended period of time with high alakalinity concentration maintained in the water. This can cause? - Answer- caustic embrittlement What condition caused by improper water treatment may be remedied by maintaining proper alkalinity? - Answer- foaming.carryover What test is used to measure hardness? - Answer- SOAP TEST What water test uses a color comparison? - Answer- phosphate When must a boiler have 2 bottom blowdown valves? - Answer- if the pressure is higher than 100 psi

What is the maximum pressure for which a seatless type blowdown valve can be used?

  • Answer- 450 psi What system is directly piped into your boiler flash tank? - Answer- continuous blowdown If you lay up a boiler for a short period of time, what concentration of caustic soda should be maintained in the boiler water? - Answer- 400 ppm What flow measurement device uses a float in a tapered glass? - Answer- rotometer What is used to line the inside of the furnace? - Answer- first-quality firebrick incomplete combution is a cause of - Answer- soot accumulation To what size is coal crushed for fluidized-bed boilers? - Answer- to less than 1/4" How are fuel oil strainers normally configured? - Answer- one strainer at the suction side of the pump and another just before the burner What would not cause your fuel oil burner to go out? - Answer- heated fuel oil What type of pump is best suited for use with fuel oil burner system? - Answer- positive displacement pump How often should the oil burner be cleaned on a HP boiler when firing heavy oils? - Answer- once per shift When banking a fuel oil fired boiler what should you do? - Answer- shut off the FD fan What is another name for a low gas pressure switch? - Answer- vaporstat When lighting a LP gas burner on a LP boiler, what is the last step? - Answer- lift the manual reset valve the primary difference between a LP and a HP gas burner is? - Answer- where the air and fuel are mixed What is the percentage of excess air needed for complete combustion when using a fuel oil burner? - Answer- 3-15% What is the only way to know for sure how much carbon monoxide you have coming out of the stack? - Answer- flue gas analysis When are soot blowers for heating surfaces used when firing coal? - Answer- once per shift

When are soot blowers on economizers and air preheaters used when firing coal? - Answer- daily What limits the amount of coal that may be burned per sqft of grate surface? - Answer- the amount of combustion air that can be delivered by the FD fan When using a coal-fired boiler, what are the recommended percentages if underfire vs overfire air? - Answer- 65%-35% When using soot blowers, what is the draft condition? - Answer- -.10 to -.15 "of h What is the temperature limit of the preheated air when operating a stoker fired boiler? - Answer- 350 degrees A wet scrubber that has been maintained properly has the capablility of absorbing ____ % of SO2 in flue gases - Answer- 90% Materials of construction of a flue gas scrubber system must be selected to resist what hostile conditions? - Answer- Low pH and abrasion The efficiency of a spray pond or cooling tower are based on? - Answer- Wet bulb temp or relative humidity of the ambient air When placing an ID cooling tower in service, which step is the last step? - Answer- start the ID fans What condition could be prevented by keeping the pH higher than 7? - Answer- corrosion When operating an ID colling tower, which statement is false? - Answer- it is more economical to operate 1 fan at high speed than two fans at low speed How long does it usually take for the boiler water level to go from half a glass to no water showing? - Answer- 2-8 minutes How often should the flame scanner be tested? - Answer- weekly When testing a safety valve on a LP boiler, how long do you hold it open? - Answer- 5- 10 seconds What is the first thing that must be done when starting up a new boiler? - Answer- Boil the boiler out When should a non-return valve be opened when putting a boiler on-line - Answer- when the boiler pressure builds to 10-25 psi below header pressure

If a steam boiler is to be taken out of service, what step should be taken first? - Answer- operate soot blower When taking a LP boiler offline, what is the first step? - Answer- secure the fire What is the last step to be performed when shutting down a boiler? - Answer- close the feedwater supply valve What is the minimum % of oxygen that must be present before entering a confined space - Answer- 19.5% With a tubular gauge glass, how do you warm up the glass? - Answer- open the drain and crack open the steam Which of the following is not done during a boiler start-up? - Answer- fill the boiler to its NOWL The water level in a boiler has been proven low. What step should be taken first? - Answer- stop the fuel and air supplies if you have a fire in the pulverizer, what action should be taken? - Answer- reduce air flow to the pulverizer What should be done before relighting a pulverized coal-fire boiler after a flame failure?

  • Answer- regulate air flow to 10% and wait 5 minutes Which of the following is a protrusion on a tube? - Answer- bag What is blistering of boiler metal? - Answer- separation of metal into layer What is the minimum sqft of heating surface at which you must have a license to operate a boiler? - Answer- 360 What must you do if your boiler license is still valid and you lose it? - Answer- submit an affidavit stating the circumstances A steam turbine that operates at 500 psi is considered? - Answer- high pressure Considering the limitation on materials of construction of a steam turbine, what is the maximum temp steam that may be used - Answer- 1100 degrees (could also be 1050) What is the economical way to partially load a small turbine? - Answer- use the minimum number of hand controlled steam nozzles feasible

What is the proper temp for turbine bearings during normal operation? - Answer- 140- 150 degrees The proper procedure for cleaning a turbine oil cooler is: - Answer- place the entire tube bundle in a cleaning tank In what type of turbine lubricating oil filtration system is oil removed at intervals and replaced with new or reconditioned oil? - Answer- Makeup system Which of the following would cause vibrations in the turbine - Answer- improper air gap in the generator If a turbine is to be S/D what step should be taken first? - Answer- gradually decrease the load to 0 What supplies the condensate pump on a surface condenser? - Answer- Hot Well When a steam turbine is operated condensing, what type valve is placed between the condenser and the turbine? - Answer- atmospheric relief valve What does FGD stand for in regard to pollution control - Answer- Flue gas desulfurization Sludge and scale will cause which of the following internal problems in a boiler, resulting in extensive repairs - Answer- bags and blistering of the boiler steel In relation to turbines, what type of valve is a water leg used on - Answer- atmospheric relief valve A motor-driven mechanical centrifuge is used for? - Answer- reconditioning turbine oil The induced draft fan is located between the - Answer- economizer and chimney A high-viscosity lubricant is more likely to develop ______ than a low-viscosity oil? - Answer- Heat What is true regardless of the installation of a water column on a water tube boiler? - Answer- the water column is located so the bottom of the gauge glass is at least 2" above the lowest permissible water level What test is not performed when operating a boiler - Answer- hydrostatic test When an economizer and combustion air preheater are both used, which fan is generally needed to ensure adequate draft? - Answer- induced draft fan

What will increase the service life of a regenative air preheater? - Answer- preventing excessively low flue gas temps How often is the overspeed trip tested - Answer- When putting the turbine online Down comer tubes are used in watertube boilers for what purpose - Answer- supply water to the lower waterwall headers Which of the following is a type of draft gauge? - Answer- manometer What type of turbine is a grid valve used? - Answer- Extraction turbine What fitting must be used when connecting a water column to a boiler? - Answer- Cross Tee How often must a fusible plug be replaced - Answer- annually What is the purpose of a steam air ejector - Answer- Remove air from condenser What device would be used to determine the amount of CO in flue gasses? - Answer- Orsat analyzer When a boiler is placed in dry layup, which of the following materials is to be placed in the boiler? - Answer- Desiccant The minimum size pipe that may be used for connecting the water column to a high- pressure boiler is: - Answer- 1" A thermostatic steam trap opens under what conditions? - Answer- When the temp inside the trap lowers When the boilers fans are interlocked, which fan must be started first - Answer- Induced draft Fan Which of the following is a benefit of using an open feedwater heater over a closed type? - Answer- An open feedwater heater drives oxygen from water Which of the following describes the proper installation of a globe valve - Answer- The flow entering the globe valve should enter below the disc