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Boiler Operator Licensing Exam
1 or more safety valves - correct answer all steam boilers must have Locked closed - correct answer before anyone enters the boiler drum, the main steam stop valve, bottom blowdown valves, & feedwater valves should be 212 degrees F - correct answer at atmospheric pressure, water begins to boil at approximately Fuel oil, gas, & coal - correct answer fuels most commonly used in boilers Steam pressure gauge - correct answer must be connected to the highest part of the steam side of the boiler Half full - correct answer with an NOWL in a boiler, the gauge glass is approximately Foaming - correct answer a high surface tension on top of the boiler water can lead to Mud drum - correct answer Bottom blowdown on a boiler removes sludge & sediment from the Tin - correct answer a boiler fusible plug is brass or bronze with a core of Pounds per square inch - correct answer a steam pressure gauge is calibrated in Try cocks - correct answer a secondary means of determining boiler water level
Oily waste rag storage - correct answer fires caused by spontaneous combustion are most likely to occur in the Steam - correct answer a siphon installed between the boiler & the pressure gauge protects the Bourdon tube from Prevent formation of scale - correct answer boiler feedwater is chemically treated to Inside tube surface - correct answer in a firetube boiler, soot accumulates on the 1.5 times the MAWP - correct answer the pressure applied on the boiler during a hydrostatic test should be Decreased - correct answer as fuel oil is heated, its viscosity is Chimney - correct answer the induced draft fan is located between the boiler & the Flash when exposed to an open flame - correct answer the flash point of fuel oil is the minimum temperature at which the fuel will Burn continually - correct answer the fire point of fuel oil is the minimum temperature at which the fuel will Lowest; flow - correct answer the pour point of fuel oil is the ____ temperature at which fuel oil will ____ Dangerous to handle - correct answer fuel oil with a low flash point is Pressure control - correct answer the operating range of a steam boiler is controlled by a
Open the boiler vent - correct answer to prevent vacuum from forming on a boiler that is coming offline Quick opening; last - correct answer low pressure boilers equipped with quick opening & screw valves are blown down by opening the ____ valve first & closing it ____ Internal resistance to flow - correct answer the viscosity of fuel oil is the measurement of the Change scale forming salts to a nonadhering sludge - correct answer feedwater is treated chemically before it enters the boiler to Minimal amount of excess air - correct answer complete combustion is defined as burning all fuel using 5 psi - correct answer when testing the safety valve by hand, there should be at least ____ of pressure on the boiler Turbulence in the gauge glass - correct answer the water column on a low pressure steam boiler reduces the By hand or by pressure - correct answer safety valves on low pressure boilers can be tested Clean the fire & water sides - correct answer before laying up a boiler, the operator must Blowdown the boiler - correct answer if water comes out of the top try cock, the operator must Secure the fires & feedwater, allow the boiler to cool slowly, & notify the boiler inspector - correct answer if steam comes out of the bottom try cock, the boiler operator must
Firetube boiler - correct answer a scotch marine boiler is a All safety valves are removed or gagged, the boiler vent is closed, the main steam stop valve is closed - correct answer when performing a hydrostatic test on a boiler Draft - correct answer the difference in pressure between 2 points of measurement that causes air or gases to flow #6 fuel oil - correct answer has high viscosity compared to #2 fuel oil Conduction - correct answer heat transfer that occurs when molecules in a material are heated & the heat is passed from molecule to molecule through the material Confined space - correct answer large enough for an employee to enter, not designed for continuous employee access, & restricted in means for entry & exit Steam trap - correct answer device that removes air & condensate without loss of steam Boiler vent - correct answer should be open when filling the boiler with water Pressure control - correct answer must be mounted vertically Quick opening valve - correct answer must be located closest to the boiler and followed by the screw valve Siphon - correct answer bourdon tube in a steam pressure gauge is protected by a Compound gauge - correct answer measures pressure or vacuum
Programmer - correct answer Secures the fuel & purges the furnace in the event of a flame failure Vacuum gauges - correct answer Calibrated in inches of mercury below atmospheric pressure Oxygen - correct answer Causes pitting of boiler material Furnace explosion - correct answer Can be caused by an accumulation of vapors Class B fires - correct answer Burn oil, grease, paint, & other flammable liquids Boiler vent - correct answer Should be kept open when the boiler is warmed up Flash point - correct answer Lower than the fire point of fuel oil Gasket leaks - correct answer If the ____ on a duplex strainer, air could be drawn into the fuel lines Primary air - correct answer Used to atomized fuel oil Cloth wrapped around a wooden dowel - correct answer Should be used to clean the inside of a gauge glass Standard - correct answer An accepted reference or practice #6 fuel oil - correct answer Has the highest heating value in btu/gal Feedwater pump - correct answer Can become steambound if feedwater temperature is too high
Water column - correct answer Should be blown down once a shift Modulating pressure control - correct answer Controls the amount of fire in the burner Priming - correct answer boiler water carried into steam lines Pressure control - correct answer Controls high & low fire 8.3 lb/gal - correct answer Water weighs approximately Expansion tank - correct answer Collects excess water in a natural circulation hot water heating system Try lever test - correct answer Tests safety valve operation Feedwater regulator - correct answer Depends on the operation of a float controlled valve Lead sulfide cell - correct answer Used in a flame scanner .433 psi - correct answer The hydrostatic pressure of every foot of vertical piping filled with water boiler ligament - correct answer thin pieces that attach tubes and keep the correct space between tubes in a tube sheet boiler stays - correct answer used to support flat surfaces in a boiler, the internal pressure will be contained without distortion
change in composition of fuel - correct answer causes creation or increase in soot deposits on tubes causing excessively high temperature on tube walls opening header drains, vents, & peepholes - correct answer can cause burns & eye injuries failing to purge firebox - correct answer can cause burns or injuries, explosion in firebox, damage to internal components, exceeding regulatory opacity limits poor control of air - correct answer can cause flame impingement, reduced boiler efficiency, exceeding opacity limits loss of boiler feedwater - correct answer can cause burns or injuries, tube rupture loss of fuel - correct answer can cause loss of downstream equipment, lost steam production baffle types - correct answer Orifice, rod, impingement, segmental water hammer - correct answer water is carried along the steam lines & hits elbows, valves, or other obstructions carryover - correct answer small particles of boiler water are carried into steam lines blowdown tank - correct answer vessel that prevents damage to the sewer system from steam and hot water by holding blowdown water until it is cool enough for safe discharge modulating control - correct answer controls the firing rate of the burner feedwater regulator - correct answer maintains the NOWL in the boiler by controlling the amount of feedwater pumped to the boiler from the surge tank
evaporation test - correct answer boiler operator allows the water level in the boiler to drop in order to test the proper operation of the low water fuel cutoff tube sheet - correct answer A metal sheet into which boiler tubes are mounted flaring - correct answer expands tubes by providing flare shape to the end of the tubes so it can be beaded to the tube sheet lap - correct answer type of joints used for seams in all riveted boiler shells Hydrostatic test & necessary pressure - correct answer Sectional boiler - correct answer Safety valve - correct answer Relief valve - correct answer How many safety's for 500sq ft - correct answer Installed boilers must be reported to state within - correct answer Dryback Boiler - correct answer refractory lined chamber outside of the vessel directs the gases of combustion from the furnace to the tubes, firetube Wetback boiler - correct answer water cooled turn around chamber directs gases of combustion from the furnace to the tube bank, firetube Boiler heating surface - correct answer
