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Boiler Operator State Test
A low pressure steam boiler has a maximum allowable working pressure (MAWP) of up to - correct answer 15 psi The evaporation of 34.5 lb of water/hr from and at a feedwater temperature of 212 degrees F is defined as - correct answer one boiler horsepower In a firetube boiler, the heat and gases of combustion pass - correct answer through the tubes A firetube boiler may be used - correct answer in high or low pressure plants Because of the large volume of water, the boiler most likely to cause a boiler explosion is - correct answer a firetube boiler A horizontal return tubular (HRT) boiler is _____________ boiler - correct answer a firetube As steam pressure in a boiler increases, there is a corresponding increase in the - correct answer temperature A sudden drop in boiler steam pressure without a corresponding drop in boiler water temperature could result in - correct answer a boiler explosion The part of a boiler that has the heat and gases of combustion on one side & water on the other side is known as the - correct answer heating surface The comparison, or ratio, of heat supplied in fuel to heat absorbed by water is defined as ___________ efficiency - correct answer thermal
Baffles are designed to direct the gases of combustion so that they come into close contact with the - correct answer boiler heating surface The steam and water drum of watertube boilers is dished (concave) to eliminate the need for - correct answer stays To increase the life of a furnace refractory, some watertube boilers are equipped with - correct answer waterwalls Vertical firetube boilers require - correct answer high ceilings, less floor space, & the use of staybolts In a watertube boiler, the heat and gases of combustion pass - correct answer around the tubes The __________ boiler has a large volume of water in relation to horsepower size - correct answer firetube Stays and braces are needed to prevent bulging in - correct answer a firetube boiler (high or low pressure) The ____________ boiler was developed to provide steam at higher pressures - correct answer watertube Boiler plates and staybolts are subjected to ____________ stress - correct answer tensile Safety valve connections must be approved by the - correct answer American Society of Mechanical Engineers (ASME) Boiler fittings are necessary for - correct answer safety & efficiency
When replacing a broken gauge glass, the water level is checked by - correct answer using the try cocks The water column and gauge glass should usually be blown down - correct answer once a shift A whistle valve is used to - correct answer warn the operator of high or low water A steam pressure gauge is calibrated in - correct answer pounds per square inch A siphon protects the steam pressure gauge from - correct answer high temperature of steam The pressure at the base of a vertical foot of water is ___________ psi - correct answer
The boiler vent is located at the - correct answer highest part of the steam side of the boiler The boiler vent is open when warming up a boiler until - correct answer there is 2 to 3 psi of steam pressure on the boiler Steam separators work: on the principle of - correct answer changing the direction of the steam flow The dry pipe is located in the - correct answer upper part of the steam and water drum Cyclone separators are used in - correct answer boilers equipped with superheaters
Saturated steam is steam at - correct answer its corresponding temperature and pressure When steam is superheated the - correct answer temperature increases with no increase in pressure Superheater tubes are protected from warping or burning out by - correct answer a continuous flow of steam Soot should be - correct answer removed from boiler tubes for better heat transfer Soot blowers are mainly found on - correct answer watertube boilers Steam impinging on boiler tubes would - correct answer cut through the boiler tubes in a very short period of time To ensure that moisture-free steam goes to the soot blower, the steam line to the soot blower must come off the - correct answer highest part of the steam side of the drum Boilers in batter equipped with manhole openings must have - correct answer 2 main steam stop valves Main boiler stop valves must be ______________ valves - correct answer os&y gate The ASME code will allow an automatic nonreturn valve to be used as a main steam stop valve. If one is used it must be - correct answer installed as close to the shell of the boiler as practical on the main steam line The main steam stop valves should be gate valves because they - correct answer offer no restriction to the flow of steam
Surface tension on the water in the steam and water drum is increased by - correct answer impurities that float on the surface of the water To protect sewer lines from the high temperature and high pressure coming from the boiler blowdown lines, - correct answer blowdown tanks are used A boiler generating 20,000 lb of steam/hr must be supplied with at least - correct answer 20,000 lb of water/hr Oxygen and other noncondensable gases are separated from the feedwater _________________ - correct answer in the open dearator feedwater heater The 4 systems required to operate a steam boiler are - correct answer steam, feedwater, fuel, & draft In order to produce 1 pound of steam, it is necessary to evaporate - correct answer 1 pound of water Steam that has lost its heat and has turned back into water is - correct answer condensate Steam is extracted from the turbine after it has passed through some of the turbine stages to - correct answer be used for process work and heating Water from an open deaerating feedwater heater flows - correct answer to the feedwater pump A safe and efficient boiler plant should include _______________ pump(s) - correct answer 1 steam & 1 electric feedwater (a shell & tube vessel to reduce exhaust pressure on the outlet end of turbines or engines) A surface condenser has water - correct answer passed through tubes to cause steam to condense, causing a vacuum
On the feedwater line near the boiler is a check valve and a stop valve. The valve closest to the shell of the boiler is the _____________ valve - correct answer stop On a boiler burning low pressure gas, the volume (amount) of gas burned is controlled by the - correct answer volume of air passing through the venturi tube On the fuel oil system, the purpose of the duplex strainers on the suction line between the tank and fuel oil pump is to - correct answer allow one strained to be cleaned without securing the boiler A draft fan located between the boiler and chimney is used in a(n) ________________ draft system - correct answer induced Natural draft is produced by a - correct answer difference in temperature of a column of gas inside the chimney from a column of air outside the chimney Pulverized coal is burned in ________________________ in the furnace - correct answer suspension Gas leaks should be located and repaired by a - correct answer gas company representative Water weighs approximately ________________ lb/gal - correct answer 8. The automatic city water makeup valve found on an open feedwater heater is used to - correct answer maintain a water level in the feedwater heater if there are insufficient condensate returns The purpose of a feedwater regulator is to - correct answer maintain a consistent water level in the boiler Feedwater regulator sensing elements are located - correct answer at the NOWL
Water temperature that is too low in the open feedwater heater could cause - correct answer oxygen pitting in the boiler By maintaining a constant water level in a boiler, it is possible to reduce - correct answer fuel consumption, thermal shock to boiler metal, & the chance of high or low water in the boiler Burning a fuel releases - correct answer heat energy A clogged vent line on a fuel oil tank being filled with fuel oil could result in a - correct answer pressure buildup, which could cause an oil spill A high suction line on a fuel oil tank is used when - correct answer signs of sludge and water are evident in the tank The purpose of the fuel oil return line is to - correct answer circulate fuel oil during warm-up, return fuel oil that bypasses the burner, & return fuel oil from the relief valve In both steam & air atomizing burners, atomization is accomplished by - correct answer live steam & air In a low pressure gas burner, a _________________ shuts off the gas supply if a low water condition exists - correct answer manual reset valve The pneumercator is used to - correct answer indicate gallons of fuel oil in the tank (fuel oil level indicating device gives direct reading in gallons) An indication of a dirty fuel oil strainer would be ______________________ across the strainer - correct answer a large pressure drop Duplex strainers are found on __________________ of the fuel oil pump - correct answer both the suction & discharge sides
Fuel oil heaters must be used when burning no. ___________________ fuel oil - correct answer 6 Fuel oil heaters must be protected from excessive fuel oil pressure because they are located _________________ the fuel pumps - correct answer on the discharge side of The rotary cup burner atomizes fuel oil using - correct answer a spinning cup and high velocity air In a pressure atomizing burner, atomization is accomplished by - correct answer rotating, high pressure oil coming out of the plug or sprayer plate A gas pressure regulator is used to control the - correct answer desired pressure at the barrier A solenoid valve is a direct-acting valve in the gas system and is used - correct answer as an automatic gas shutoff valve (an electromagnetic valve positioned open/closed) To prevent caking and to dry the coal entering the pulverizer, - correct answer warm air is used Blowers are used in a high pressure gas system to - correct answer supply air for combustion The air-to-gas ratio is maintained by a(n) - correct answer air damper, butterfly valve, & modulating motor & linkage The gas pressure reducing valve in the low pressure gas system reduces the gas pressure to ___________ psi - correct answer 0 The amount of gas drawn into the air steam in a low pressure gas system is controlled by the - correct answer venturi effect (venturi= constricting device used in pipelines to measure flow)
To reduce the heat loss of flue gases going to the chimney, boilers are equipped with - correct answer economizers and air heaters The convection air heater employs a counterflow principle in which the gases of combustion - correct answer move up while the air goes down Both air and flue gas temperatures are controlled by - correct answer the use of bypass dampers (controls the air temp in air heaters to prevent corrosion) If the temperature of air entering the heater gets too low, it will cause - correct answer condensation on the gas side of the air heater Air heaters must be cleaned to ensure good heat transfer by - correct answer using soot blowers Air heaters can most successfully be used in plants that - correct answer have a fairly constant steam load If air supplied for combustion mixes with gases of combustion, it could lead to - correct answer a loss of air for combustion and lower boiler efficiency A diaphragm draft gauge is calibrated in - correct answer inches of water Mechanical draft is produced by the - correct answer power-driven fans Mechanical draft can be classified as - correct answer forced or induced The amount of draft available in a natural draft system is dependent on the - correct answer height of the chimney The gases of combustion leaving a boiler that has natural draft are controlled by - correct answer outlet dampers
The induced draft fan is located - correct answer between the boiler and the chimney Mechanical draft is used when burning - correct answer fuel oil, coal, & gas Larger steam boilers that are equipped with air heaters and/or economizers must use - correct answer both forced & induced draft fans When using mechanical draft, it is possible to - correct answer increase the rate of combustion Draft pressure maintained at a constant pressure is called a ________________ draft system - correct answer balanced The temperature at which fuel oil will give off a vapor that will ignite readily when exposed to an open flame is its ______________ point - correct answer flash In order to determine the heating value of coal in Btu per pound, the - correct answer ultimate analysis is used The temperature at which fuel oil will give off a vapor that burns continuously is its _______________ point - correct answer fire Rank refers to the ___________________ of the coal - correct answer degree of hardness Grade refers to the _________________ of the coal - correct answer size, heating value, & ash content A proximate analysis of coal provides information regarding its - correct answer moisture content, content of volatile matter, & fixed carbon & ash content
____________________ combustion is when all the fuel is burned using the minimal amount of excess air - correct answer complete Gases of combustion that cool on contact with the boiler heating surface before combustion is completed cause a(n) - correct answer formation of soot & smoke Air needed for the combustion of fuel is made up of approximately _____________% oxygen & ___________________% nitrogen - correct answer 21; 79 Soot and smoke are the result of ________________ combustion - correct answer incomplete _________________ is a combustible found in fuel - correct answer Carbon, Sulfur, & Hydrogen Carbon Dioxide in the flue gas indicates - correct answer compete combustion Carbon monoxide in the flue gas indicates - correct answer incomplete combustion The Orsat gas analyzer measures the percentage of ________________ in the flue gas - correct answer carbon dioxide, carbon monoxide, & oxygen __________________ is a type of combustion - correct answer Complete, Perfect, & Incomplete No. _______________ fuel oil must be heated to reach the required temperature for combustion - correct answer 6 Higher numbered fuel oil produce ___________________ lower numbered fuel oils - correct answer more Btu per gallon than
The heating value of a fuel is expressed in - correct answer British thermal units The primary function of a combustion control is to ensure - correct answer safe & efficient boiler operation The ON/OFF control system is usually found on - correct answer package fire tube boilers The purpose of the boiler pressure control found in the ON/OFF control system is to - correct answer start & stop the burner on steam pressure demand The ON/OFF pressure control must be connected to the - correct answer highest part of the steam side of the boiler A steam siphon ensures that ____________________ does not enter the boiler pressure control - correct answer steam A mercury-tube pressure control will only be accurate when it is installed - correct answer in a vertical position The 4 elements that must be regulated in a combustion control system are - correct answer fuel supply, air supply, ratio of air to fuel, & removal of combustion gases The 2 scales found on the boiler pressure control are used to - correct answer set the operating steam pressure range of the boiler The purpose of the boiler modulating pressure control is to - correct answer regulate the high & low firing rate of the burner The modulating pressure control must be connected to the - correct answer highest part of the steam side of the boiler
The positioning combustion control system is sensitive to changes in the - correct answer steam header pressure The most common type of pressure control used in the ___________ type - correct answer mercury-tube Pressure gauges are calibrated in pounds per - correct answer square inch Absolute pressure is equal to - correct answer gauge pressure plus atmospheric pressure A boiler steam pressure gauge should have a range of - correct answer 1.5 to 2 times the safety valve setting The boiler steam-pressure gauge must be connected to the _______________ of the boiler - correct answer highest part of the steam side The boiler steam-pressure gauge is protected from high temperatures by - correct answer a siphon A primary reason for using thermocouples for measuring temperatures is - correct answer to take & read the readings for remote plants centrally Vacuum gauges are calibrated in inches of __________________ atmospheric pressure - correct answer mercury below Most thermometers used in a steam plant are calibrated in - correct answer degrees Fahrenheit Thermocouples measure - correct answer temperature
A _________________ reading can be read using a thermocouple - correct answer superheated steam, gases of combustion, & condensate return Liquids in a tank may be measured from a remote location using a - correct answer pneumercator Flow meters measure the rate of flow of - correct answer a variety of fluids The differential-pressure flow meter functions by receiving a difference of pressure across a(n) - correct answer venturi, orifice plate, & flow nozzle The rotameter flow meter consists of a - correct answer ball in a tapered tube The types of variable-area flow meters are ______________ and ______________ - correct answer rotameter; valve Recorders are used to - correct answer give an overall view of the steam plant operation A Ringelmann chart is used to determine - correct answer smoke density Light and a photoelectric cell are sometimes used to indicate - correct answer smoke density Smoke indicators are often essential because - correct answer the boiler operator cannot always see the chimney to observe smoking conditions Modern steam plants use instruments to - correct answer promote safe & efficient operation Boiler water must be conditioned to prevent - correct answer formation of scale, oxygen pitting, & carryover
