3RD CLASS STATIONARY STEAM
ENGINEER LICENSE PREP ACTUAL
EXAM 250 QUESTIONS WITH
VERIFIED SOLUTIONS LATEST AND
COMPLETE VERSION 2025
"a globe valve installed in the feed water line between the feed water pump and boiler has a
pressure from the feed water pump_________ the valve disc - CORRECT ANSWER=> under"
"the range of a pressure gauge should be twice the safety valve setting, but not less than______
time (s) the safety valve setting - CORRECT ANSWER=> 1 1/2"
"hard scale formed on the inside of tubes is best removed by________ - CORRECT ANSWER=> air-
or water-driven turbines"
"to correct a low water condition,_____ - CORRECT ANSWER=> secure fires"
"desuperheater drain is used to_______ - CORRECT ANSWER=> establish steam flow"
"a sudden rise in chimney temperature with no increase in load indicates______ - CORRECT
ANSWER=> there is a broken baffle"
"the btu content of natural gas is_____ - CORRECT ANSWER=> 100,000 btu/therm"
"the safety valve setting on the Steam and water drum is ________ a superheater safety valve -
CORRECT ANSWER=> higher than"
"the btu content of number 6 fuel oil is approximately - CORRECT ANSWER=> 18750 BTU / lb"
"chemicals can be added to a boiler by a______pump - CORRECT ANSWER=> proportioning"
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,"the feed water stop valve is found between the____ - CORRECT ANSWER=> boiler and check
valve"
"sensible heat is______ - CORRECT ANSWER=> heat that can be measured with a thermometer"
"balanced draft is______ - CORRECT ANSWER=> constant furnace pressure slightly below
atmospheric pressure"
"a flame rod_______ - CORRECT ANSWER=> ensures that the gas pilot is lighted"
"there are approximately_____btu in 1 cu ft of Natural Gas - CORRECT ANSWER=> 1000"
"the pH of boiler water may be controlled by using ______ - CORRECT ANSWER=> caustic soda"
"boiler water with a pH of 11 is________ - CORRECT ANSWER=> alkaline"
"a scotch Marine boiler is easily identified because it_____ - CORRECT ANSWER=> has a
cylindrical internal furnace"
"the air flow switch at the burner fan housing________ - CORRECT ANSWER=> and shows the
primary air fan is functioning"
"the asme code recommends that low water fuel cutoff switch be tested by an evaporation
test__________ - CORRECT ANSWER=> monthly"
"a neutral solution is_______ on the pH scale - CORRECT ANSWER=> 7"
"a dry pipe separator _____ - CORRECT ANSWER=> delivers higher-quality steam to the header"
"draft is carefully controlled to_____ - CORRECT ANSWER=> completely burn fuel supplied to the
burner"
"draft is measured with a_________ - CORRECT ANSWER=> manometer"
"a ringelmann test is used to determine_______ - CORRECT ANSWER=> smoke density"
"a flame scanner proves (verifies) __________ - CORRECT ANSWER=> pilot in Maine Flame"
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, "according to the asme code, when warming up a boiler the air cock is closed when_______ -
CORRECT ANSWER=> the steam pressure gauge reads 25 psi"
"a motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity -
CORRECT ANSWER=> 80"
"a deposit of scale or mud in an HRT boiler could cause_____ - CORRECT ANSWER=> a bag to
develop"
"water wall tubes protect the refractory and_____ - CORRECT ANSWER=> increase boiler heating
surface"
"steam at E250 psia and 400 degrees Fahrenheit is considered______ Steam - CORRECT
ANSWER=> saturated"
"sensible heat is heat that_____ - CORRECT ANSWER=> changes a substances temperature but
not its state"
"extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______
psi - CORRECT ANSWER=> 125"
"to check the water level on a boiler online, it is best to_____ - CORRECT ANSWER=> blowdown
the gauge glass"
"a steam pressure gauge has a siphon between the boiler and the pressure gauge to _______ -
CORRECT ANSWER=> prevent Steam from entering the pressure gauge"
"if a boiler evaporates 50,000 lbs of steam/hour and is evaporating 10 pounds of steam/sq ft of
heating surface, the heating surface of the boiler is ____sq ft - CORRECT ANSWER=> 5000"
"oxygen in feed water causes ______ - CORRECT ANSWER=> pitting"
"it is permissible to have one blowdown valve on a boiler operated under______ psi - CORRECT
ANSWER=> 100"
"at atmospheric pressure, water boils and turns to steam at _____ °f - CORRECT ANSWER=> 212"
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ENGINEER LICENSE PREP ACTUAL
EXAM 250 QUESTIONS WITH
VERIFIED SOLUTIONS LATEST AND
COMPLETE VERSION 2025
"a globe valve installed in the feed water line between the feed water pump and boiler has a
pressure from the feed water pump_________ the valve disc - CORRECT ANSWER=> under"
"the range of a pressure gauge should be twice the safety valve setting, but not less than______
time (s) the safety valve setting - CORRECT ANSWER=> 1 1/2"
"hard scale formed on the inside of tubes is best removed by________ - CORRECT ANSWER=> air-
or water-driven turbines"
"to correct a low water condition,_____ - CORRECT ANSWER=> secure fires"
"desuperheater drain is used to_______ - CORRECT ANSWER=> establish steam flow"
"a sudden rise in chimney temperature with no increase in load indicates______ - CORRECT
ANSWER=> there is a broken baffle"
"the btu content of natural gas is_____ - CORRECT ANSWER=> 100,000 btu/therm"
"the safety valve setting on the Steam and water drum is ________ a superheater safety valve -
CORRECT ANSWER=> higher than"
"the btu content of number 6 fuel oil is approximately - CORRECT ANSWER=> 18750 BTU / lb"
"chemicals can be added to a boiler by a______pump - CORRECT ANSWER=> proportioning"
Page | 1
,"the feed water stop valve is found between the____ - CORRECT ANSWER=> boiler and check
valve"
"sensible heat is______ - CORRECT ANSWER=> heat that can be measured with a thermometer"
"balanced draft is______ - CORRECT ANSWER=> constant furnace pressure slightly below
atmospheric pressure"
"a flame rod_______ - CORRECT ANSWER=> ensures that the gas pilot is lighted"
"there are approximately_____btu in 1 cu ft of Natural Gas - CORRECT ANSWER=> 1000"
"the pH of boiler water may be controlled by using ______ - CORRECT ANSWER=> caustic soda"
"boiler water with a pH of 11 is________ - CORRECT ANSWER=> alkaline"
"a scotch Marine boiler is easily identified because it_____ - CORRECT ANSWER=> has a
cylindrical internal furnace"
"the air flow switch at the burner fan housing________ - CORRECT ANSWER=> and shows the
primary air fan is functioning"
"the asme code recommends that low water fuel cutoff switch be tested by an evaporation
test__________ - CORRECT ANSWER=> monthly"
"a neutral solution is_______ on the pH scale - CORRECT ANSWER=> 7"
"a dry pipe separator _____ - CORRECT ANSWER=> delivers higher-quality steam to the header"
"draft is carefully controlled to_____ - CORRECT ANSWER=> completely burn fuel supplied to the
burner"
"draft is measured with a_________ - CORRECT ANSWER=> manometer"
"a ringelmann test is used to determine_______ - CORRECT ANSWER=> smoke density"
"a flame scanner proves (verifies) __________ - CORRECT ANSWER=> pilot in Maine Flame"
Page | 2
, "according to the asme code, when warming up a boiler the air cock is closed when_______ -
CORRECT ANSWER=> the steam pressure gauge reads 25 psi"
"a motor rated at 25 horsepower delivering 20 horsepower is operating at_______% capacity -
CORRECT ANSWER=> 80"
"a deposit of scale or mud in an HRT boiler could cause_____ - CORRECT ANSWER=> a bag to
develop"
"water wall tubes protect the refractory and_____ - CORRECT ANSWER=> increase boiler heating
surface"
"steam at E250 psia and 400 degrees Fahrenheit is considered______ Steam - CORRECT
ANSWER=> saturated"
"sensible heat is heat that_____ - CORRECT ANSWER=> changes a substances temperature but
not its state"
"extra-heavy pipe must be used on blowdown lines when the steam pressure exceeds______
psi - CORRECT ANSWER=> 125"
"to check the water level on a boiler online, it is best to_____ - CORRECT ANSWER=> blowdown
the gauge glass"
"a steam pressure gauge has a siphon between the boiler and the pressure gauge to _______ -
CORRECT ANSWER=> prevent Steam from entering the pressure gauge"
"if a boiler evaporates 50,000 lbs of steam/hour and is evaporating 10 pounds of steam/sq ft of
heating surface, the heating surface of the boiler is ____sq ft - CORRECT ANSWER=> 5000"
"oxygen in feed water causes ______ - CORRECT ANSWER=> pitting"
"it is permissible to have one blowdown valve on a boiler operated under______ psi - CORRECT
ANSWER=> 100"
"at atmospheric pressure, water boils and turns to steam at _____ °f - CORRECT ANSWER=> 212"
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