minnesota low pressure boiler practice exam
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| an aquastat stops and starts the burner by sensing the (what?) temperature? | boiler water
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| the number of blowdowns required can be determined by (what)? | testing the boiler water.
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| oxygen in the boiler causes (what)? | Pitting
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| impurities on the surface of the water in a steam and water drum are best removed by (what kind of blowdown)? | surface.
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| a modulating pressure control on a steam boiler does what? | controls high and low fire
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| a (what) is a boiler water treatment accessory that heats feedwater to the the tmep of staurated steam within the pressure vessel. | deaerator
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| when a boiler is observed to be at a pressure above the safety valve setting the first thing to do is (what) | secure the boiler
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| the first thing a boiler operator should do when taking over a shift is to check the (what) for all boilers that are operating? | water level in the gauge
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| a boiler generating 20000 lb/hr of steam must be supplied with at least (how much) feed water. | 20000
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| when starting up a boiler and bringing it on-line in a battery with another boiler, the main steam stop valve should be opened (____________) than the header pressure. | slowly when the boiler pressure is slightly less
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| as a normal precaution when doing a bottom blow down the boiler operator should.....what...? | never remove their hands from an open valve, always check the boiler water level, perform the blowdown under a light load
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| if the top gauge glass fitting from the water column is blocked on a boiler under stam pressure , the water level in the gauge glass will ( what) if the water level in the boiler remains constant? | increase
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| when a boiler is being cleaned , reparied or inspected, the main steam stop valve must be ( what )? | tightly closed, locked and tagged out
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| a boiler furnace explosion is caused by (what) | ignition of combustable gasses in the furnace
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| a (what) protects a hot water boiler from exceeding its MAWP? | relief valve
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| when starting up a boiler and bringing it on line, all A) steam valves must be open B)condensate drains must be closed C)condensate drains must be opened D)air vents must be closed | C) condensate drains must be opened.
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| after replacing a broken gauge glass the new one should be warmed up by opening (what) | the steam valve to the gauge glass
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| (what) are used in boilers to direct the gasses of combustion over the boiler heating surface? | Baffles
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| when taking a boiler off-line, the (what) must be open to prevent a vacuum from forming in the boiler? A) the main steam stop valve? B) the air vent | B) the air vent
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| a low pH in boiler water indicates that ( what ) is likely to occur? | corrosion
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| what increases when water changes to steam? A) temperature B)sensible heat C)volume | C)volume
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| what protects a bourdon tube in the pressure gauge from the heat of the steam? | siphon
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| bottom blow down is used to (what) | remove sludge and sediment
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| sensible heat is ........ what? | heat that can be measured with a thermometer
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| in a watertube boiler the heat and gasses of combustion pass where? | around tubes filled with water
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| what is the minimum drain size for a water column? 1in. 1/2 in. 3/4 in. 1/4 in. | 3/4 in.
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| minimum size blowdown line on a mini boiler 3/4 inch 1/2 inch 1 inch | 1/2 inch
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| what type of valve is permitted to shut off a steam gauge? A)gate B)globe C)lever | c) lever
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| what pipe size is used for a steam gauge? 1/4in. or 1/2 in.? | 1/4in.
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| what size pipe is used for the water column? 1 inch or 1/2 inch? | 1 inch
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| what is the minimum drain size on a water column? 1/4 inch? 1/3 inch? 1/2 inch? 3/4 inch? | 3/4 inch?
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| What pipe sizes are used on a water column? | one inch for the water column pipe and 3/4 inch for the water column drain.
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| what control is the mastermind of the burner control system | the programmer
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| the (what) is the part of the boiler with water on one side and heat on the other? a-furnace b- heating surface c-fireside d-water side? | d- heating surface
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| sensible heat is heat that is (what)? a-causes a temperature change b-causes no temperature change c-boils water d- changes ice to water | a-causes a temperature change
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| (what) is the condition where a flame travels upwind and into the burner assembly a-flashback b-flame propagation c- light-off d-ignition | a-flashback
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| to prevent a vacuum from forming when taking the boiler off-line the ( what ) must be open when pressure is still on the boiler? a- safety valve b- main steam stop valve c-boiler vent d-automatic non return valve? | c- boiler vent
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| (what) combustion is caused by self-ignition through chemical action? a- theoretical b- spontaneous c-complete d- pilot? | b-spontaneous
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| (what) discharged from the bottom try cock indicates a low water condition in the boiler? a- steam b-water c-condensate d-fuel oil | a-steam
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| impurities in a boiler from the manuacturing process are removed through the use of (what?) a-steam blowing b- bchemical feedwater treatment c-boil out d-stean tube cleaning | c- boil out
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| How many different types of low water fuel cut of are in general use? | 2 types, electric and float
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| how many low water cut offs are required a- one b- two c- one on hot water boilers and two on steam boilers d- none are required | c- at least one on hot water boilers
and two on steam boilers
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| what size drain does the low water cut off have to have? a-1/4 b-1/2 c- 3/4 d- 1 inch | 3/4 inch vertical drain to facilitate flushing the float chamber
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| where can the low water cut off be attached? a-to the boiler......b- to the gauge glass... c-both the boiler or the gauge glass...........d-to the feedwater line? | c-to the boiler or the gauge glass
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| minimum size for a safety valve? 1/2 inche 3/4 inch 1 inch 2 inch? | 3/4 inch minimum
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| maximum size for a safety valve? 1 inch 1.5 inches 3 inches 4.5 inches | 4.5 inches
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| what do boiler pipes have to be made of? | sschedule 40 black iron
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| what does the water column drain size have to be? 1/4 1/2 3/4 | 3/4
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| what is the graduation on a pressure gauge? 30 to 60 60 to 90 30 to 90 1 to 100 | 30 to 60
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| pressure gauge may only be provided with a shut off cock if has a (what) handle | tee or lever
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| how often does a pressure control have to be inspected? | twice a year
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| minimum pipe size for a pressure control | 1/4
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| what is sodium sulfite used for in a boiler? | an oxygen scavenger
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| if the LWCO is attached to the gauge glass what size pipe must be used? 1/4in. 1/3 in. 1/2in. 3/4in. | 1/2in.
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| the low water cut off can be attached directly to the boiler with black iron pipe or attached to the gauge glass. If it is attached to the gauge glass what type and size of piping must be used? | non ferrous 1/2 inch piping
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| what size pipe is used to attach the LWCO to the gauge glass? | 1/2 inch
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| what is the minimum and maximum size for a safety valve? | 3/4 inch and 4.5 inches
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| The makeup water feeder can be used as a feedwater regulator True or False? | False
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| A globe valve used as a feedwater stop valve must be installed so inlet pressure is applied from under the valve disc true or false? | true
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| Centrifugal feedwater pumps are commonly driven by steam True or false? | false, they are driven by electric motor
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| A slow opening valve used as a bottom blow down valve requires how many complete 360 degree turns to open? | 5
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| applying a hydrostatic test on a boiler the water temperatures should be what? 50, 70, 212 or 250 degrees F? | 70
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| What is meant by flash point and fire point? | fire point is the lowest temperature that fuel will continue to burn
flash point is ignite briefly, but might not sustain the fire.
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| what is sodium sulfite used for? | oxygen scavenger
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| When could stop valves be eliminated for a single hot water heating boiler? | when the boiler is located above the system
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| what is a water flow proving switch | electrical switch activated by flow of water, connected to the boiler control circuit must be activated for burner to function (secondary safety control to LWCO)
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| in some heating systems the circulation pump is controlled by what? a thermostat, a pressure control or a water flow proving switch? | a thermostat
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| what is hydrostatic pressure? | the weight of water per vertical foot
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| how do you calculate hydrostatic pressure | .433 x vertical distance
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| what is the hydrostatic pressure of line that has a distance of 15 feet? | .433 x 15 = 6.495 (6.5)
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| area of a valve disc formula? | .7854 x D²
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