left filled with saltwater with the sea valves closed The steam pressure and volume will remain constant. critical end point

Transcription

1 13 1 D A bridge gage is normally used to determine turbine bearing oil clearance diaphragm tip blade axial clearance bearing wear clearance Coast Guard Regulations (46 CFR) requires machinery within the space outside of the space at the throttle station within the fire room 13 2 B machinery driving the fuel oil transfer and fuel oil service pumps to concerned concerned be fitted with a remote means of stopping that 13 3 D If a ship is to be laid up for an indefinite period, the saltwater side of the main condenser should be left filled with saltwater with the sea valves closed left filled with saltwater with the sea valves open drained and refilled with saltwater after closing the sea valves drained and dried out after closing the sea valves 13 4 D 13 5 D According to U.S. Coast Guard Regulations (46 CFR), which of the following pumps is required to have a pressure gage provided on the discharge side of the pump? Assume that steam has formed in a boiler in which all of the steam stop valves are closed, and the water level is held constant. When there is an increase in the of the steam and water in the boiler, which of the following effects will occur? Fire pump Boiler Feed pump Fuel oil transfer pump The steam pressure and volume will remain constant. The pressure will increase and the volume will remain constant. The pressure will remain constant and the volume will increase. All of the above The pressure will increase and the specific volume will decrease B When a mixture of steam and water in a boiler has reached the point at which NO further change in state can occur with the addition of heat, the mixture is considered to have reached its supercritical end point critical end point vaporization end point saturation end point 13 7 D 13 8 D 13 9 D Which symbol shown in the illustration is used to identify a stop-check valve on a drawing? If the water level cannot be seen in the lower part of the boiler gage glass, which of the following actions must be carried out immediately? The item labeled "C" in the illustration, is the A B C D Increase the feedwater going to the boiler. low pressure drain connection Check the DC heater water level. high pressure drain connection Blowdown the boiler. Secure the boiler fires. low pressure vent connection low pressure steam supply connection SG-0014 SG D C B Fuel oil solenoid valves at the burner fronts should be of the manual reset type to Axial movement in a gear-type flexible coupling is provided for by A sectional (sinuous) header boiler is classified as which of the listed boiler types? permit the operator to secure each burner during a blackout each gear sliding on its shaft between retaining collars permit the operator to secure each burner after a blackout the variable oil clearance in the quill shaft prevent the furnace prevent the furnace filling with oil during a filling with oil after power failure restoration of power gear teeth on the floating member sliding between internal teeth on the shaft ring Bent tube Straight tube Express D-type adjusting the pitch of the teeth on the pinion and high speed gears 1

2 13 14 B Which of the following fuel oil characteristics establishes the danger point when transferring, pumping, and firing procedures are concerned? Fire point Flash point Specific gravity Viscosity When condenser tube ends are rolled into both tube belled joints at both threaded brass expansion joints in metallic packing C sheets, the different rates of material expansion is tube ends ferrules on the tube the condenser shell pressed around the compensated for by utilizing ends tube ends A B B The Butterworth heater shown in the illustration receives steam at approximately The BTU value of fuel oil is determined by a/an The variable capacity pressure atomizing fuel oil burner functions to 130 psi 170 psi 205 psi 850 psi open cup test calorimeter hydrometer viscosimeter maintain a constant fuel provide a wide range of combustion provide a constant fuel return pressure maintain smokeless fuel oil atomization SG D B C As the ph of the boiler water approaches zero, the water becomes increasingly A combustion control system diaphragm type air flow transmitter receives its high pressure signal from the boiler Concerning the classification of steam turbines, a cross compound designed unit soft alkaline neutral acidic fan discharge windbox furnace smoke box consists of reaction stages and a dummy piston consists of one Curtis stage and reaction blading consists of a high pressure turbine, crossover pipe, and low pressure turbine is made up of a varied assortment of impulse and reaction staging B D A sectional (sinuous) header boiler is classified as a/an The required number of pounds of steam generated per overload capacity for hour to develop contract shaft horsepower and maintain each boiler the specified pressures and s in the plant, when divided by the number of installed boilers, will give the bent tube type straight tube type "A" type "D" type efficiency of each boiler efficiency of each fire room full power capacity of each boiler D A A Condensate return lines from tank heating coils are led to the In which of the listed components is chemical energy converted to thermal energy with regards to boiler operation? Coast Guard Regulations (46 CFR) regarding hydrostatic testing of main steam piping state that atmospheric drain main condenser DC heater contaminated drain tank system Furnace Superheater Steam drum Economizer the hydrostatic test shall be applied from the boiler drum to the throttle valve not less than fifty percent of the lagging shall be removed each time the hydrostatic test is applied the hydrostatic test pressure must be maintained on the piping for a minimum of one hour a pipe with a nominal size of six inches or more is not required to be hydrostatically tested 2

3 If the water level in a steaming boiler is dropping rapidly secure the fires and secure the steam blowdown the gage speed up the feed A and cannot be kept at the normal level by standard then secure the stop and then secure glass to find the true pump to raise the practices, you should steam stop the fires water level water to normal C The total heating surface of any steam generating unit is comprised of which of the listed surfaces? Those parts of a boiler which are exposed on one side to only the water being heated and on the other side to the combustion gases, such as the economizer surfaces. Those parts of a boiler which are exposed on one side to only the steam being heated and on the other side to the combustion gases, such as the superheater surfaces. Those parts of a boiler which are exposed on one side to the water or steam being heated, and on the other side to the combustion gases. Those parts of a boiler which are exposed on one side to only the water being heated and on the other side being directly exposed to the furnace flame C A A C A combustion control system, diaphragm-type, air volume regulator receives its low pressure signal from the boiler In a cross-compound main propulsion unit, the astern turbine is usually installed at the The purpose of a 'peep' hole in the boiler casing is to If a centrifugal main feed pump were operated at shutoff head with the recirculating line closed, which of the following conditions could occur? windbox casing furnace smoke pipe low pressure end of the low pressure turbine high pressure end of the low pressure turbine examine the check the operation condition of the flame of the soot blowers A decreased water level in the DC heater. An increased water level in the steam drum. low pressure end of the high pressure turbine check for excess smoke in the stack Flashing at the suction side of the pump. high pressure end of the high pressure turbine examine the condition of the refractory cones Excessive diaphragm seal wear in the feedwater regulator D If a vessel is steaming at a steady rate, and the water level has dropped out of sight in the boiler gage glass, the FIRST corrective action should be to open the feedwater bypass regulator blowdown the boiler gage glass slow down the engines cut out the fires A D Which of the stated pressure conditions identifies the boiler design pressure? The process of breaking up fuel oil into fine particles to ensure good combustion is called The pressure specified by the manufacturer as a criteria for boiler design. A pressure lower than boiler operating pressure. The same pressure as the boiler operating pressure at full power capacity. The pressure at which a boiler is operated during overload conditions. settling straining pumping atomization C Depending upon the design of the boiler, the constant pressure maintained at the steam drum or the superheater outlet is known as the designed maximum pressure overload pressure operating pressure output pressure 3

4 In the event of a failure of the pneumatic control constant-pressure constant-volume manually controlled thermo-hydraulic C system, a multi-element feedwater regulator is designed regulator feedwater regulator feedwater regulator feedwater regulator to operate as a A An efficient seal is normally obtained between the upper and lower halves of a turbine casing by precision metal-tometal contact copper gaskets asbestos gaskets flexible steel seal strips D C Which of the listed systems would be a potential source for the high pressure drain system? How is boiler water forced to circulate faster in accelerated natural circulation boilers, than in free natural circulation boilers? Galley steam tables Increasing the density of the water. Laundry steam pressing machines Installing a water circulating pump, such as a hydrokineter. Fuel oil tank heating coils Increasing the inclined angle of the generating tubes. Steam systems operating in excess of 150 psi Increasing the surface area of the economizer exposed to the combustion gases D A D During initial starting of the standby turbine-driven boiler feed pump, which of the listed valves should remain closed? The of the fuel oil received during bunkering operations is critical in determining the A natural circulation water-tube boiler, with one or more water drums, would be classified as a/an Turbine exhaust valve expansion space to leave in a tank accelerated natural circulation boiler Turbine steam supply valve flash point at which the fuel will burn controlled circulation boiler Pump suction valve to which the fuel must be heated header-type boiler Pump discharge check valve rate at which the fuel can be pumped during transfer operations drum-type boiler C C C C B B The flash point of a residual fuel oil should be used to determine the highest to which the oil may be heated In addition to a nozzle, a fuel oil atomizer uses which of the listed parts? That portion of the steam drum, containing a manhole for internal access to the drum, for the purpose of cleaning, inspecting, and carrying out repairs, is called the Which of the following statements represents the major difference between a boiler drum and a header? In a single furnace boiler, where is the steam typically cooled for use as auxiliary steam? To prevent pulsations from developing in the boiler feedwater lines, the discharge side of a reciprocating feed pump is equipped with a/an for atomizing for centrifuging in a storage tank in the recirculating line Ignition electrode Burner cone Sprayer plate Air cone end plate wrapper sheet drumhead tube sheet The s at which they are operated. The number of tubes permitted to enter a drum or header. The size of each is significantly different. Superheater Desuperheater Condenser Air ejector The size of the tubes permitted to penetrate the drum or header. feedwater regulator air chamber relief valve reed valve 4

5 When the boiler is operating at high firing rates, in Downcomers and Superheater support, Water screen, Water wall, water B addition to the generating tubes, which of the following water wall tubes water screen, and superheater support, screen, and tubes will also function as generating tubes? water wall tubes and economizer economizer tubes tubes C The flash point of a residual fuel oil should be used to determine the highest to which the oil may be heated for atomization minimum to which the oil should be heated for transferring highest to which the oil may be heated in a storage tank minimum to which the oil should be heated in the fuel oil heater D A C A A B D C B In order for a maximum number of boiler generating and circulating tubes to be installed without weakening the tube sheet, which of the listed procedures should be carried out? Which of the following methods is used to counter axial thrust in a single flow reaction turbine? Corrosion due to electrolytic action in modern watertube boilers is uncommon because Which of the following statements describes those portions of the piping maintained under positive pressure when a pressure-closed feed system is in operation? All rows of tubes should be bent at the same angle. A dummy piston and cylinder at the turbine inlet end boiler water is a strong electrolytic All condensate and feed piping except for a short section between the condenser and condensate pump. All rows of tubes should be installed horizontal to the drum. Pressure equalizing holes in the individual rotor wheels alkalinity control treatment prevents electrolytic action Only the section between the condensate pump and deaerating feed tank. Different rows of tubes should be bent to enter the drum at any convenient angle. Labyrinth packing boiler components are generally constructed of similar metals Only the section between the deaerating feed tank and the boiler. All tubes should be installed normal to the drum surfaces. Carbon packing electrolytic action cannot occur at high pressure Only the section between the condenser and the condensate pump. Recirculation of the feedwater ensures a flow of water through the main feed pump economizer standby feed pump suction line third stage heater Which of the listed components would be considered Main condenser Deaerating feed tank Main air ejectors Boiler drum the dividing line separating the condensate system from the feedwater system? When heating heavy fuel oil for use in main propulsion it is necessary to the boiler is being the superheater it is required for boilers aboard ship, the flash point may be exceeded transfer the fuel fired under maximum has proper atomization only when load been higher than normal The primary purpose of the sprayer plate in a mechanical atomizing oil burner is to The amount of sodium phosphate in treated boiler water can be measured by a/an completely mix air with the fuel assist in mixing produce a fine, atomizing steam with swirling, uniform fuel the fuel mist prevent primary air mixing with the fuel alkalinity test phosphate test chloride test sodium phosphorous test 5

6 If a ship with an automated engine room system main feedwater stop main feed pump D develops a 'high' boiler water level at half speed, the valve will recirculating line will automatically close automatically open D Which of the following types of main propulsion turbines is most likely to require a dummy piston or cylinder arrangement to counterbalance axial thrust? Double flow impulse turbine Multistage impulse turbine surface blow valve will automatically open to lower the level Double flow reaction turbine throttle will be automatically prevented from opening any further Single flow reaction turbine C C D C A Longitudinal expansion of a boiler water drum is permitted by the Which of the components listed prevents water from flowing back into the auxiliary exhaust line if the deaerating feed tank becomes flooded? Air removed from the main condenser is vented to the atmosphere through the Which of the pumps listed operates at constant speed and delivers water to the deaerating feed tank at a nearly constant pressure? Which characteristic of fuel oil is the most significant when determining the to which the fuel oil must be heated for proper atomization? tubes casing foundation refractory Exhaust piping Pumps Check valve Reverse-acting relief valve vacuum breaker vent condenser atmospheric drain tank Main feed booster Main feed pump Main condensate pump pump aftercondenser Main circulating pump Viscosity Flash point Pour point Specific gravity A B C The purpose of the relief valve in a fuel oil service system is to Condensate pumps have distinctly noticeable characteristics and can usually be recognized by their Which of the devices listed is used to keep overheated condensate from flowing to the deaerating feed tank? protect the service pump from high discharge pressure speed-limiting governors and closed impellers regulate the atomizer oil pressure large suction chambers and impeller eyes control the oil pressure regulators multiple impellers and pump shaft positions Saltwater cooler Freshwater cooler Recirculating line to the main condenser supply constant pressure to the burner combustion control valves open impellers and power ends Recirculating line to the main feed pump B Which of the following statements represents the purpose of boiler sliding feet? To ensure an airtight seal between the boiler inner and outer casings. To accommodate the changing length of the water drum as it expands or contracts with changes. To compensate for deflection of the hull in way of the boiler supports. To allow for unequal expansion between the wrapper and tube sheets A D The net positive suction head of a boiler centrifugal feed pump should be calculated over and above the To combat galvanic corrosion, condensers utilizing copper-nickel waterboxes are usually fitted with feedwater vapor pressure speed of the impeller pump capacity in gpm impeller ratio of the pump bonding straps iron or steel anodes protective coatings all of the above 6

7 In the illustrated hydraulically operated turbine gland bellows at "I" spring at "F" vacuum at "G" pressure at "A" B seal regulator, the exhaust dump valve is closed as a result of the piston being actuated by a/an_ SE C Modern fuel oil control devices are regulated to obtain a desired viscosity rather than a specific fuel oil because residual fuel oils have the same viscosity characteristics regardless of where they are refined the of the fuel oil varies with the flow rate through the heater the relationship between and viscosity varies with different fuels viscosity regulation eliminates the need for close control of the fuel/air ratio A In the hydraulically operated turbine gland seal regulator, illustrated, the device used as the gland seal pressure sensing unit is called a/an bellows manifold pilot valve pivot rods and block SE C D C A test of boiler water for chloride content indicates the amount of The boiler feedwater control valve varies the unity relationship between steam and water flow during periods of Gland sealing steam is used during steam turbine operation to prevent the loss of suspended matter present dissolved gases present seawater contamination present all of the above minimum boiler load steady boiler load overload operation load change oil air vacuum D Low pressure steam is used to keep air from leaking into turbine casing along the turbine shaft. For this purpose, which of the following steam systems is used? Direct admission of 35 psi (241.3 kpa) auxiliary steam Superheated steam system Gland leakoff steam system Gland sealing steam system C B C A In a closed feed and condensate system, the drain from the second stage air ejector returns directly to the Which of the water supplies listed below is typically used as a cooling medium for the gland exhaust condenser, intercondenser, and aftercondenser of an air ejector unit? The viscosity of a residual fuel oil is measured in Saybolt Relief valves in the fuel oil service system discharge to either the service pump suction or the auxiliary condenser loop seal atmospheric drain tank deaerating feed tank Seawater Condensate Potable water Evaporator distillate Milliliters Universal Millimeters Universal Seconds Furol Minutes Universal settling tanks recirculating line simplex fuel oil strainer slop retention tank D Testing boiler water for chloride content will indicate the amount of total alkalinity in the water phosphates present in the water methyl orange that should be added dissolved salts from sea contamination 7

8 D If the entire pneumatic control to a multi-element feedwater regulator fails, the feedwater valve is controlled by constant pump pressure regulator remote manual control regulator single-element feedwater regulator local manual control C One advantage of installing water wall tubes in a boiler increase furnace size reduce furnace decrease refractory reduce combustion furnace is to maintenance rates Which statement listed represents a vital function of the The recovery of main condenser? feedwater for reuse A Cooling of the exhaust steam from the auxiliary exhaust system before it enters the deaerating feed tank. Storage of feedwater for immediate use in the boilers. Condensing of the exhaust steam from the main feed turbine pumps D Which of the listed conditions aids in directing gland leakoff steam from the low pressure propulsion turbine to pass through the gland exhaust condenser? Steam pressure from the low pressure turbine. Steam pressure from the high pressure turbine. Compressed air in the air pilot. The use of a gland exhauster fan D Heat introduced to the condenser by exhausting steam is removed by the circulation of reserve feedwater cold condensate low pressure drains seawater C C What unit, or factor creates most of the vacuum within a tight and adequately cooled main condenser once the main engine is in operation? In what positions will the air-operated regulating valves, shown in the illustration, be in when the steam in the gland seal supply line is excessive? Main condensate pump Both valves are open. Main air ejector Both valves are closed. Condensation of turbine exhaust steam The excess steam unloading valve is open and the supply pressure control valve is shut. Counterflow of seawater over the surface of the tubes with the flow of exhaust steam in the tubes The excess steam unloading valve is shut and the supply pressure control valve is open. SE C A C The primary objective of the auxiliary exhaust system is to supply steam to the You should blow down a gage glass periodically to Fine adjustments to a boiler combustion control system, to bring about near perfect combustion, should be made by manually adjusting the main condenser main feed pumps deaerating feed tank soot blowers remove any sediment from the glass maintain the proper water level in the steam drum provide water samples for the second assistant fuel oil back pressure air volume regulators fuel/air ratio knob test the feedwater stop-check valve forced draft fan dampers D The advantage of installing water wall tubes in a boiler furnace is to increase the flow of gases through the furnace decrease the flow of gases through the furnace increase heat transfer to the mud drum permit higher combustion rates 8

9 Steam drum water level indicators must be calibrated to lower level than lower level than higher level than higher level than B compensate for density differences between the indicated drum water level, and the actual drum water level. If no compensation is made, the indicator will show a exists in the drum with the error becoming greater as the drum pressure decreases exists in the drum with the error becoming greater as the drum pressure increases exists in the drum with the error becoming greater as the drum pressure decreases exists in the drum with the error becoming greater as the drum pressure increases A The main condensate pump in a steam propulsion plant discharges directly to the air ejector intercondenser main condenser hotwell air ejector aftercondenser DC heater vent condenser A A The set point pressure at which the first boiler safety valve is to lift is the The items labeled "D" in the illustration are the maximum steam drum pressure low pressure drain connections boiler overload capacity high pressure drain connections operating design pressure low pressure vent connections boiler full-power capacity low pressure steam supply connections SG A D Which of the boiler components listed receives feedwater and serves as an area for the accumulation of saturated steam? Which of the listed boiler components is used to equalize the distribution of water to the generating tubes and provide an area for the accumulation of loose scale and other solid matter present in the boiler water? Steam drum Headers Water drum Superheater headers Downcomer Steam drum Water drum only Water drum and headers C When firing a boiler in local manual control, an increase in boiler load must be accompanied by a/an increase in the fuel oil flow before an increase in the forced draft pressure decrease in the forced draft air pressure before a decrease in the fuel oil flow increase in the forced draft air pressure before an increase in the fuel oil flow increase or a decrease in the fuel oil flow and forced draft air pressure simultaneously B Design characteristics of a velocity-compounded impulse turbine include the utilization of one or more nozzles with one row of rotating blades a single pressure stage with two or more velocity stages a low velocity steam jet from a nozzle two or more simple impulse stages C B C Rows of tubes installed along the walls, floor, and roof of the furnace are called The connection labeled "B" in the illustration is used to Which of the tube types listed can be considered to serve as downcomers at low firing rates, and as generating tubes at high firing rates on some boilers? screen tubes downcomers water walls water headers maintain a vacuum in the shell of the feed water heater provide a point of admission for the steam air heater drains provide a point of admission for the L.P. bleed steam Water screen tubes Water wall tubes Superheater support tubes drain condensate from the feed water heater to the main condenser Riser tubes SG

10 Which of the following actions should be taken to reestablish a 'blown' air ejector loop seal? B Increase the condensate flow through the air ejector. Momentarily close the valve in the loop seal line, then reopen slowly. Shut off the steam to the second stage air ejector momentarily then open it again. Decrease the steam pressure to the air ejector nozzles D A A D B The life of the furnace lining can be affected by In most marine boilers, the primary reason the first few rows of generating tubes, called screen or furnace row tubes, are made larger in diameter than the rest of the generating tubes is because the quality of installation they require more water flow since they are exposed to the greatest heat the service environment they must screen the superheater from the direct radiant heat of the burners the proper application of inspection criteria they must act as downcomers to ensure proper circulation all of the above their main function is to retard combustion gas flow for maximum heat transfer rates A unit of measure used to express the chloride content of boiler water is PPM Micro-Farads ph Micro-Ohms Which of the following devices can be used to secure or Brick bolts Boiler tubes Anchor strips All of the above hold furnace refractory in position? When turbine rotor shafts extend through the casing, an maintain the rotor seal the casing seal the casing provide a constant external source of sealing steam is used in conjunction journal during periods of low during periods of flow to the gland leak with labyrinth packing to casing pressure high casing pressure off condenser A A corbel in the furnace of a water-tube boiler is a fillet of plastic refractory used as a means of excluding preformed burner slag from the joints at arch section the furnace floor, walls, and corners foundation for refractory anchor bolts set of gas baffles in the screen tubes C Nichrome wire is used when patching boiler furnaces for anchoring plastic refractory only reinforcing castable and plastic refractory anchoring castable refractory only anchoring castable and plastic refractory C Which of the following statements is correct regarding the start-up operation of a non-condensing turbinedriven feed pump? Keep the steam exhaust valve closed until steam is applied to ensure that the auxiliary exhaust line pressure does not drop. Keep the pump casing vent valve closed until flow is established through the pump. Open the pump suction valve prior to admitting steam to the turbine. Secure all drains prior to admitting any steam to avoid damage to traps A A In a main propulsion steam turbine installation, the condensate pump initially discharges to the Slagging of boiler furnaces is a slow progressive action which is accelerated by air ejector condenser deaerating feed tank first stage heater distillate tank fuel oils having high ash content low firing rates prolonged feedwater contamination of fuel oil burning diesel fuel 10

11 A Which constituent of fuel oil determines the specific Hydrocarbons Oxygen Nitrogen Sulphur heat? B Which of the listed refractory materials is capable of Chrome castable Firebrick Insulating brick Insulating block providing structural stability? Which of the following statements represents the Provides structural function of insulating brick? stability D B B A corbel in the furnace of a water-tube boiler is a Which of the following statements represents the function of insulation block? preformed burner arch section It is used to protect firebrick from maximum s. Acts as a gas-side layer at high areas in D-type boilers. fillet of plastic refractory It is generally used as the first layer on the inside of inner casings. Provides the first layer at the inside of inner casing. formation of soot on furnace floor It is used to provide structural stability. Acts as backup insulation behind firebrick, plastic refractory, or castable refractory. type of refractory anchor bolt Typically used as a gas-side layer at low areas in D-type boilers A C D When operating with the auxiliary feed line, feedwater flow is controlled Serious tube leaks in the air ejector condenser assembly will cause The primary purpose of refractory mortar is manually by throttling the auxiliary feed stop-check valve clogged steam strainers to seal brickwork joints automatically by the main feedwater regulator manually by adjustment of the auxiliary feedwater regulator spring setting automatically by the economizer bypass fouled nozzles loss of vacuum faulty steam pressure to seal tile installation to provide cushioning all of the above joints of individual pieces against concentrated stresses C Which of the following refractory materials contains a hydraulic-setting binder and develops strength without needing to be heated in a manner similar to concrete? Plastic fireclay Plastic chrome ore Castable fireclay Refractory mortar A C Pumps normally used for fuel oil service are A major difference between the two element and the three element feedwater regulator control systems, is that a three element system will additionally measure and incorporate the positive displacement rotary pumps drum water level to the feedwater regulator two-stage centrifugal pumps steam flow to the feedwater regulator explosion proof gear pumps feedwater flow as sensed variable non-vented plunger pumps fuel oil flow to the feedwater regulator D Labyrinth seals used to reduce leakage around a turbine shaft are constructed of spring bound carbon segments braided asbestos covered core segments staged rubber composition seal stripping machined metallic packing strips or fins 11

12 A A corbel is used in a boiler furnace to protect the reduce gas direct the flow of contain the furnace expansion joints turbulence gases heat Which of the following refractory materials is preferred Castable fireclay Plastic fireclay Plastic chrome ore Chrome castable A for small repairs, particularly where standard size brick or tile cannot be used? The cooling water flow from an air ejector main condenser auxiliary condenser condensate and feed atmospheric drain C intercondenser and aftercondenser is discharged directly into the hotwell hotwell system tank D As a general rule, for proper results castable fireclay 12 hours 18 hours 24 hours 48 hours or longer must be air cured for B Which of the significant combustible elements of fuel oil Oxygen Sulphur Hydrogen Carbon is a major source of boiler corrosion? B Which of the pumps listed is normally used in fuel oil service systems? Two-stage centrifugal Positive displacement rotary Explosion proof gear Non-vented plunger B D A B D D Phenolphthalein is used as an indicator to test boiler water for Where are moisture shields located in a main propulsion steam turbine? Boiler refractory firebrick is secured to the casing by Which of the listed refractory materials will develop required strength only after being heated at a of 1095 C (2000 F) or higher? Makeup feedwater is brought into an operating closed feed system via the Steam condensed in the air ejector intercondenser, drains to the hardness alkalinity hydrazine chloride content Around throttle valve stems slots in the brick engaging anchor bolts At the steam strainer inlet high strength tensile fasteners At the inner stage diaphragms studding on the water wall tubes After the last stage of the ahead rotor blading fast drying plastic refractory mortar Castable fireclay Plastic fireclay Castable insulation Chrome castable main feed pump auxiliary feed pump feed booster pump condenser vacuum drag line atmospheric drain aftercondenser drain vent condenser drain main condenser tank tank tank through the loop seal D Due to of the curing characteristics of plastic refractory, its use should be avoided in high areas burner fronts small repairs low areas C B C What is indicated by the code number 32Y20 stamped on a burner sprayer plate? Sprayer plate orifice area is 0.32 square inch. Sprayer plate Sprayer plate orifice Sprayer plate requires a size 20 tip. was made with a size requires a minimum 32 drill. of 20 psi fuel pressure. Phenolphthalein indicator is used in the boiler water test dissolved oxygen alkalinity chloride content hardness for Which of the listed refractory materials can be used as Insulating cement Castable fireclay Castable insulation None of the above a substitute for insulating brick and insulating block in certain boiler walls construction? 12

13 Which of the following statements represents the function the nozzle assembly performs in an impulse turbine? A Converts the steam's thermal energy into kinetic energy by increasing its velocity and directing it against the rotor blades. Provides an area where the steam is prevented from expanding prior to being directed against the rotor blades. Increases the velocity of the steam without a pressure drop across the diaphragm. Converts the potential energy of steam into thermal energy by increasing its pressure and directing it against the turbine blades A Boiler refractory anchor bolts are secured to the casing by hooked ends inserted into pads welded to the casing slots in the firebrick high strength tensile fasteners furnace mortar D B B C Which of the listed refractory materials is a suitable substitute for insulating block only? Which of the listed conditions will always result in dissolved oxygen being carried over from the main condenser? The loop seal connected to the main condenser returns the drains from the A desirable property of boiler fuel oil is Insulating brick Insulating cement Castable insulation None of the above Priming in the boiler. Taking on makeup feed. Dumping auxiliary exhaust steam to the main condenser. Excessive DC heater. vent condenser intercondenser aftercondenser all of the above low carbon content per pound of fuel high sulphur content for complete combustion high BTU content per pound of fuel low residual acid after combustion A A Which of the following statements represents the advantage of castable insulation over either insulating brick or insulating block installations? A sodium sulfite test is performed on a boiler water sample to determine if The speed and economy of installation. there is any excess sulfite present Its resistance to high s. the ph of the boiler water is within the prescribed limits Its high comparative strength. the dissolved oxygen in the boiler water is within tolerable limits Its comparative greater insulating value. the hardness factor is maintained as close to zero as possible A C D Which of the listed refractory materials is composed of wool fibers and clay binders? Nozzle diaphragms are installed in pressurecompounded impulse turbines to The primary purpose of insulating cement is Insulating cement Castable fireclay Chrome castable ore All of the above support moving blades to seal joints in brickwork support shrouding to anchor insulating block to the casing hold the nozzles of the stage and admit steam to moving blades to cushion the pieces against concentrated stresses eliminate blade and nozzle losses to fill voids in the insulation block layers at missing corners or at cutouts for anchor devices 13

14 Under EMERGENCY operating conditions, the proper valve positions for controlling feedwater to the boiler should be the B auxiliary stop-check valve fully open and the auxiliary stop valve used to regulate the amount of flow auxiliary stop valve fully open and the auxiliary stop-check valve used to regulate the amount of flow auxiliary stop and stop-check valves fully open and the feed pump speed used to regulate the amount of flow auxiliary stop-check valve fully open and the auxiliary stop valve regulated by the feedwater regulator B D Which of the following refractory materials can provide a straight backing surface for insulation block where minor casing warp has occurred? The presence of sulphur in fuel oil will most likely cause Castable insulation Insulating cement Castable fireclay Chrome castable a decrease in the ability of the oil to be properly atomized an excessive heat content per unit volume heavy slag formation on the refractory corrosion on the firesides of the boiler B C A C A D A C B B A Which atomizing sprayer plate has the largest capacity? PCRS Which of the listed refractory materials may be used with other machinery insulation arrangements outside of the boiler? Brick bolts, tile bolts, and pennant anchors are attached to the inner casing by A pressure-velocity compounded impulse turbine consists of Which of the listed refractory materials can be used in an area directly exposed to the highest heat in the furnace? Which of the following statements represents the primary function of handholes used on a boiler? If manual control of the water level in a steaming boiler is required, the proper method of control is with the auxiliary feed In the condensate system, the automatic recirculating valve can be actuated by the The primary source of steam to the auxiliary exhaust system is typically supplied directly from Castable fireclay Refractory mortar Insulating cement Castable insulation retaining clips fillet welds tack welds All of the above are correct. velocity several rows of two or more stages two or more rows of compounding with moving blades of velocity nozzles in which no reaction pressure attached to compounding pressure drop exists compounding diaphragms Firebrick Insulating brick Insulating block Baffle mix To allow access into the steam and water drum. To allow access for cleaning in the stack. To provide access for cleaning out the firebox. To allow access into the headers. stop-check valve stop valve pump speed control pump pressure control DC heater water level the main engine LP bleed superheater steam flow turbine driven and reciprocating steam pumps vanadium and sodium condensate the turbine gland exhaust system condensate pump discharge pressure all of the above The most harmful slag forming compounds found in fuel iron and sulphur potassium and nickel calcium and silica oils are Which group of numbers would indicate the largest fuel PCRS 4309 capacity for a sprayer plate in a mechanical fuel oil atomizer? 14

15 Normally a boiler water sample should be taken after the boiler has been blown down B before the boiler has been blown down or chemicals added when the boiler has been refilled with makeup from the highest point in the feed system C D B A The contaminated drain system normally receives drains that may be exposed to Which of the devices listed is found on an LP main propulsion steam turbine casing? In a steam propulsion plant, the primary source of auxiliary exhaust steam is from the Which of the operating principles listed would apply to a single-element, thermo-hydraulic, feedwater regulator? salt water contamination spoiled food contamination oil contamination water contamination due to boiler treatment Sentinel valve Duplex set of relief Sliding beam HP turbine bypass valves valve main condenser main feed pump distilling plant air heaters A failure of the regulator pressure actuating system closes the valve. The regulator maintains a constant water level throughout the boiler load range. The cooling fins on the generator prevent the formation of steam in the closed system. The pressure in the inner tube acts upon the bellows of the regulator C B D B C B Main condensate recirculating systems are primarily intended to Which of the casualties listed is apt to occur immediately after a high water casualty? Heavy slagging and high corrosion of boiler tubes can result from using a fuel oil with high amounts of Which precaution should be observed to prevent damage to the fuel oil service pump when warming up the fuel service system? The last two digits stamped on a fuel oil atomizer sprayer plate represents the cross-sectional area ratios of the tangential slots and orifice. This ratio determines the In a water-tube boiler, circulation is caused by the difference in the prevent excessive overheating of the condensate pumps Massive tube failure balance and control condensate s at full load Water carryover to the turbines provide adequate cooling water for the air ejector condensers Excessive steam pressure vent accumulated vapors from the condensate pump discharge Excessive superheater ash sodium chloride salts vanadium salts all of the above Strip all water from the fuel oil settlers. density of the oil spray area and length of the water-tubes Close the recirculating valve when the proper atomization is reached. degree of atomization densities within the circulating water Heat the fuel oil in the settlers to the atomization. angle of the cone heights of the boiler drum Bypass the fuel oil meter so that recirculating oil does not register. capacity of the atomizer angle of inclination of the tubes C B Shrouding on impulse turbine blading is held in place by The means of circulation commonly found in water-tube boilers is seal welding circumferential peening the tenons locking keys dovetails compound accelerated natural cross-compound integral 15

16 C Which of the following statements is true concerning the operation of a boiler thermo-hydraulic feedwater regulator? A D A A The DC Heater functions to A lower than normal boiler stack gas usually indicates The number '29' on a fuel oil burner sprayer plate marked '2909' indicates the Eight (8) ounces of oxygen, dissolved in 500,000 pounds of water, is a concentration of A failure in the regulator pressure actuating system opens the feed valve wide. store, heat, and deaerate feedwater The regulator maintains constant water level throughout all boiler load ranges. chemically treat feedwater to remove carbonic gas The inner tube of the generator is open to the steam and water in the steam drum. ensure recirculation in the feedwater system The outer tube of the generator transfers heat to the inner tube of the closed system. remove the major amount of noncondensable gases from the main condenser dirty firesides dirty watersides fuel high sulfur content incomplete combustion orifice size cross-sectional area whirling chamber slot cross-sectional ratio size area 1.0 ppm 4.0 ppm 8.0 ppm 16.0 ppm B C A The steam separator as used in conjunction with a steam whistle normally drains to which of the listed drain systems? Allowance for axial expansion of the steam turbine due to changes is provided for by the use of Which of the following statements concerning boiler steam drum surface blow piping is correct? Low pressure High pressure Main turbine Contaminated casing flexible joints Usually the surface blow pipe is perforated with holes along its top surface; however, when a scum pan is also employed, the holes are located along the bottom of the pipe surface. rotor position indicators The centerline of the pipe is normally situated at a distance from the bottom of the steam drum equal to approximately one fourth the diameter of the drum. a deep flexible I beam support To ensure adequate blowdown, the aggregate cross sectional area of these perforated holes must be equal to approximately twice the cross sectional area of the pipe. pivoted-shoe type thrust bearings All of the above C Clean low pressure steam drains are collected in the deaerating feedwater heater contaminated drain inspection tank atmospheric drain tank main condenser hotwell A In a single-element feedwater regulator, the amount of valve opening and closing is controlled by the water level in the drum steam pressure in the drum steam flow from the boiler feedwater flow to the boiler 16

17 Which statement is true concerning drain inspection Inspection tanks tanks? collect all HP drains B D C From which of the areas listed are condensate drains normally collected and returned to the low pressure drain system? Economy and efficiency in the operation of a marine boiler have traditionally been characterized by Steam whistle separator/trap a clear stack (invisible stack gases) Inspection tanks provide for a visual examination of condensate which could be oil contaminated. Each main feed pump steam supply line maintaining the fuel oil as high as possible They are discharged to the condensate system just forward of the feed pump. Steam systems operating in excess of 150 psi a light brown haze from the stack They collect condensate from the cargo tank heating coils only. Main and auxiliary air ejector aftercondensers a slight wisp of white smoke from the stack B C B When warming up a fuel oil service system, you should open the steam supply to the fuel oil heaters A dissolved oxygen concentration of 8.0 ppm represents The level in the atmospheric drain tank is normally maintained by the use of a/an before you start the fuel oil service pump 8 lbs of oxygen dissolved in 1,000,000 tons of water after you start the fuel oil service pump 8 tons of oxygen dissolved in 1,000,000 pounds of water overflow to the bilges float-type regulator only if the settlers are incapable of heating the oil 8 ounces of oxygen dissolved in 1,000,000 ounces of water vacuum drag to the air ejector condenser before you open the recirculating valve 80 ounces of oxygen dissolved in 100,000 ounces of water overflow to a distillate tank C B D B B B B C In a boiler equipped with a convection type superheater, the superheater tubes are located in the path of the radiant heat of combustion in the steam drum Single-element automatic feedwater regulators are controlled by the The DC heater functions to remove air from feedwater If live steam is supplied directly to the tank heating main and/or auxiliary coils, the collected drains in the 'clean' section of the condenser contaminated drain inspection tank are removed directly to the A light brown haze issuing from the boiler smoke stack generally indicates The entire unit which houses the burner, air scoop, air doors and bladed cone is correctly called the If it should become necessary to abandon a compartment because of the danger of a large steam leak on a boiler, which of the following actions represents the best avenue of escape? The percentage by weight of steam in a mixture of steam and water is called the between the downtake nipple and circulator tube water level in the steam drum in a position screened from the furnace between the economizer and generating tubes feedwater flow to steam drum pressure in the steam drum heat feedwater store feedwater all of the above atmospheric drain tank deaerating feedwater heater makeup feedwater tank dirty fuel atomizers good fuel combustion too much fuel pressure a high firing rate burner assembly register assembly atomizer assembly air duct assembly Escape through another compartment on a higher level. Escape through another compartment on a lower level. Escape by way of a fire room ladder to the outer deck. Use fire room elevator to an upper deck. moisture percentage moisture quality quality of steam heat effectiveness 17