Ohio stationary steam engineer Exam (Latest 2024/ 2025 Update) With Questions and Verified, Exams of Mechanical Engineering

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Ohio stationary steam engineer Exam (Latest 2024/ 2025 Update) With

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Combustion efficiency may be increased by_____ the primary air - ✔✔Preheating What is the purpose of cinder reinjection? - ✔✔increase efficiency 2 forces of equal intensity acting in opposite directions is? - ✔✔tension What is true about the dew poimt of flue gasses - ✔✔dew point is the temp at which the gasses will condense What will not cause high stack temps? - ✔✔plugged dry pipe What is true about smoke - ✔✔smoke consists of unburned hydrocarbons WHat is used to reduce SO2 emissions in coal fired boilers? - ✔✔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 _______ - ✔✔operate soot blowers What watertube bolier is the largest in size and steam-generating compacitity - ✔✔Utility watertube boiler the blowdown on a safety valve can be altered by changing the setting of the _____ - ✔✔huddling ring Copper and brass piping may be used for piping systems as long as the temp does not exceed - ✔✔ 406 degrees

What is not measured in a 3 element feedwater system

• feedwater flow
• drum pressure
• steam flow
• drum level - ✔✔drum pressure If the flame in a gas-fired bolier is pulsating how can the problem be fixed? - ✔✔increase furnace draft Grindability of coal is an issue to be considered when operating which kid of coal-burining equipment? - ✔✔ball-and-race pulvarizer When using an induced draft fan, where will the strongest negative draft be found - ✔✔at the inlet of the ID fan How do you bank a fuel oil-fired boiler? - ✔✔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 - ✔✔it must readily seperate oil and water What supplies the oil to a large steam turbine during start-up - ✔✔aux oil pump What device prevents the over-travel of the governor linkage that might be caused by the weight of the governor components - ✔✔Dashpot When taking a boiler out of service what should you not do - ✔✔close the vent what type of turbine oil purification system periodically removes a potion of the oil and replaces it with fresh oil? - ✔✔makeup oil system

If a boiler requires a second safety valve, the highest pressure setting on the additional valve should not exceed the MAWP by more than - ✔✔3% Steam is tapped off a turbine casing at several pressures for aux. uses in the production plant. the steam is called: - ✔✔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 - ✔✔The ID is increased What problem is caused by dirty condenser tubes? - ✔✔inability to maintain a normal vacuum on condenser A lubrication with low viscosity is usually: - ✔✔adapted to high RPM use On a bicolor gauge glass water will appear ____ and steam will appear _____ - ✔✔green, red Name 2 common classes of steam turbine blading: - ✔✔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 - ✔✔The speed of the turbine is decreased A boiler is industrial when: - ✔✔The steam is used for a manufacturing process

What is the function of the dashpot? - ✔✔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 - ✔✔Inspect exterior What oil pressure should be maintained when using a turbine oil pump with a relief valve - ✔✔ 50 - 55 PSI What is the first step when starting a steam turbine? - ✔✔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: - ✔✔Velocity-compound turbine What should be part of the monthly preventive maintenance program for a steam turbine? - ✔✔Check oil reservoir for sludge or water What is the purpose of the aux. oil pump in a steam turbine installation? - ✔✔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? - ✔✔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? - ✔✔4950 (10% over normal operation speed) All of the following are causes of vibration in a turbine EXCEPT:

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 - ✔✔6% What is the purpose of magnetic particle testing? - ✔✔Expose surface and near-surface flaws in ferrous metals What grade fuel oil may be ignited by an electric spark - ✔✔# 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 - ✔✔Industrial boilers operate at lower pressures and temps How long can a boiler operator be away from the boiler? - ✔✔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: - ✔✔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? - ✔✔bouncing erradically What advantage does a filter baghouse have over an electrostatic precipitator in its operation? - ✔✔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 - ✔✔ 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? - ✔✔ 3 - 4 inches When must your boilers operators license be renewed? - ✔✔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? - ✔✔60 ppm (10x's) What is the pressure on a low pressure gas burner? - ✔✔0 psi When testing a safety valve manually on a low-pressure boiler, how long do you hold it open? - ✔✔ 5 - 10 seconds Where does the water leave a blowdown tank? - ✔✔the bottom Which fan blade design is best for preventing corrosion due to flyash particles entrained in the flue gas flow? - ✔✔radial straight Which chemical is often used to control algae accumulation in cooling towers? - ✔✔copper sulfate Where must your boiler operators license be kept? - ✔✔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 - ✔✔every 24 hours If scale has accumulated inside tubes of a watertube boiler, it is best removed by: - ✔✔an air-driven turbine tube cleaner

What condition is caused by the presence of oxygen in the boiler? - ✔✔pitting For what is the ringlemann test used? - ✔✔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 - ✔✔4 seconds Under what condition is it common for a combustion air preheater to be bypassed? - ✔✔whe the boiler is being started, or operating under a light load A therm of natural gas is_____ - ✔✔100,000 BTU reguarless of the exact volume How are the tubes usually secured in the construction of a firetube boiler? - ✔✔expanded with a madrel and then beaded What is used to heat feedwater passing through an economizer? - ✔✔gasses of combustion exiting the boiler What type of pump is generally used for delivering chemical treatment solutions into a steam boiler - ✔✔metering pump What is the flash point of fuel oil - ✔✔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 - ✔✔-secure the feedwater going to the boiler

What is measured to determine how much excess air is being used for combustion? - ✔✔the % of O2 in the flue gases What change in steam pressure in the boiler occurs when the bottom blowdown valves are opened? - ✔✔there is no change What is commonly used to increase the quality of the steam leaving the boiler? - ✔✔dry pipe What vale presents the least resistance to flow of steam? - ✔✔gate valve What is true about #6 fuel oil? - ✔✔it must be preheated in order to burn well What is the greatest energy loss in the operation of a steam boiler? - ✔✔heat lost up the stack to atmosphere To raise the pH of boiler water, what should be added to the chemical treatment? - ✔✔caustic soda In a low pressure heating system, which type of steam trap is most commonly used? - ✔✔thermostatic steam trap What type of feedwater regulator is best for a boiler that has a wide pressure and load swings? - ✔✔ 3 element In which form of heat transfer does heat travel from molecule to molecule without displacing the molecules? - ✔✔conduction what condition does graphitization cause in boiler steel? - ✔✔makes steel weaker What is true about the operation of an overfeed stoker? - ✔✔coal is fed from above the grates

What represents the performance of industrial boilers? - ✔✔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: - ✔✔creep what is the minimum size of an elliptical manhole - ✔✔11"x15" What problem may be caused by serious leaks in washers around tubular gauge glass? - ✔✔false water level reading What advantage is offered by a centrifugal boiler feedwater pump over other types? - ✔✔steadier flow produced Diffusion rings are found in: - ✔✔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 - ✔✔net positive suction What determines the frequency of ash removal in a boiler with dumping grates - ✔✔fuel bed thickness What is key to attaining smokeless combustion? - ✔✔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? - ✔✔gas pressure regulator To keep the electrostatic precipitator working properly, you should - ✔✔maintain the rapping system in good condition

In a boiler plant that is continually attended, that standard is to blowdown the water column: - ✔✔once per shift The bottom blowdown system will provide the best results when: - ✔✔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 - ✔✔-The super heater safety valve should open before the steam drum safety valve how may the frequency of bottom blowdown valve use be determined? - ✔✔the blowdown should be operated as much as needed according to the boiler water analysis Fuel oil with low flash point is: - ✔✔more hazardous than fuel oil with high flash point What is true about a closed feedwater heater? - ✔✔steam and water do not come in direct contact Water hammer is caused by - ✔✔failure to drain condensate from piping For what purpose are manometers? - ✔✔measuring flue gas and combustion air pressures Which device controls the operating pressure range of a package steam boiler? - ✔✔operating limit pressure control What is a moajor cause of air pollution emitted by burning coal or heavy fuel oil? - ✔✔sulfur dioxide The pour point of fuel is - ✔✔the lowest temp at which oil will flow

The quick drain test of the low water cutoff control should be tested at what frequency? - ✔✔daily What parts make up the heating surface of a scotch-marine boiler? - ✔✔the flue and tubes A boiler is an industrial boiler when - ✔✔the steam generated is used for process Utility boilers are used primarily to produce: - ✔✔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 - ✔✔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 - ✔✔The tube is lengthened What is the minimum water temp to be used in a hydrostatic test? - ✔✔70 degrees How many sq ft of heating surface is required to produce 1 horsepower in a HRT firetube boiler? - ✔✔ 12 sq ft How many sq ft of heating surface to produce 1 boiler HP in a vertical firetube boiler - ✔✔14 sqft How many sq ft of heating surface to produce 1 boiler HP in a watertube boiler - ✔✔10 sqft

If a high pressure boiler is at its highest operating pressure below MAWP where will the pointer on the pressure gauge be? - ✔✔at 12 o'clock A gauge that reads higher than actual boiler pressure is called a: - ✔✔fast gauge What is true about a boiler pressure mercury switch - ✔✔mercury switch must be installed with pigtail siphon vertically On a LP boiler cut out equals: - ✔✔cut in plus differential On a LP boiler, the pressure switch is installed: - ✔✔vertical with the high point up What is the maximum blowback on a safety valve that is set for 100 psig? - ✔✔4 psi What is the minimum blowback of a safety valve that pops at 250 psi? - ✔✔5 psi When an accumulation test is perfomed the boiler is fired at: - ✔✔max firing rate with the main steam stop valve closed oils and solid accumulating on water surface in a boiler can lead to: - ✔✔foaming A boiler has carried a large slug of water over into steam. This condition is called: - ✔✔priming How do steam seperators work? - ✔✔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? - ✔✔1/4" if copper 1/2" if steel When may copper tubing not be used? - ✔✔over 406 degrees

When using a 3 element feedwater regulating system, which is the analog input? - ✔✔drum level How often should a makeup feedwater regulating system in a LP boiler be blown down? - ✔✔once per week A centrifugal pump is characterized by its: - ✔✔diffusion rings When starting a centrifugal pump the valve should be set with the - ✔✔suction open, discharge closed Lube oils should not give off volatile vapors at: - ✔✔ 325 - 350 degrees A type of pump that uses the velocity of steam against a mass of water is a : - ✔✔injector Calcium and magnesium are removed by what external water treatment process that can be regenerated using sodium chloride? - ✔✔zeolite softener What is the best way to get good water treatment results? - ✔✔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 - ✔✔either 1 or 2 What pH value shows alkalinity? - ✔✔ 9 A boiler has been under stress for an extended period of time with high alakalinity concentration maintained in the water. This can cause? - ✔✔caustic embrittlement

What condition caused by improper water treatment may be remedied by maintaining proper alkalinity?

• ✔✔foaming.carryover What test is used to measure hardness? - ✔✔SOAP TEST What water test uses a color comparison? - ✔✔phosphate When must a boiler have 2 bottom blowdown valves? - ✔✔if the pressure is higher than 100 psi What is the maximum pressure for which a seatless type blowdown valve can be used? - ✔✔450 psi What system is directly piped into your boiler flash tank? - ✔✔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? - ✔✔400 ppm What flow measurement device uses a float in a tapered glass? - ✔✔rotometer What is used to line the inside of the furnace? - ✔✔first-quality firebrick incomplete combution is a cause of - ✔✔soot accumulation To what size is coal crushed for fluidized-bed boilers? - ✔✔to less than 1/4" How are fuel oil strainers normally configured? - ✔✔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? - ✔✔heated fuel oil