STATIONARY ENGINEER EVALUATION TEST QUESTIONS
AND SOLUTIONS 2025/2026 GRADED A+
✔✔A ________thermometer uses two dissimilar metals that bend predictably with a
change in temp. - ✔✔BIMETALIC
✔✔Minimum size for the connection between the guage glass and the water column is
_______ - ✔✔1/2"
✔✔2 or more saftey valves are required on a boiler with a heating surface inexcess of
______square feet or electric imput of ________KW - ✔✔500 sq ft ; 500KW
✔✔Safetey valves on a superheater should be set _____than the safety valve on the
steam drum - ✔✔lower
✔✔Boiler stop valves over 2 inches in diameter should be ___ _______ ___ ______. -
✔✔OS&Y
✔✔When boiler pressure exceeds _____psi; two blowdown valves must be used; one
must be a slow opening valve - ✔✔100
✔✔Slow opening blowdown valves must complete ___turns between full open and full
shut. - ✔✔5
✔✔A COPES feedwater regulator is an example of a ________ ____________type
feedwater regulator. - ✔✔thermostatic mechanical
✔✔The feedwater control valve position is controlled by the _______ of the fluid as
caused by the temp changes caused by water level changes in the thermostatic tube -
✔✔PRESSURE
✔✔The 3 element feedwater regulator senses ________ _________ AND_________. -
✔✔steam flow - feedwater flow - and water level
✔✔The _______ ________uses boiler water to complete the electrical circuit -
✔✔submerged electrode
✔✔The submerged electrode does not have a __________ _______. - ✔✔mercury
switch
✔✔2 types of electric boilers - ✔✔RESISTANCE and ELECTRODE
,✔✔Electric current flows through the water and converts electrical energy to heat
energy in the ________type boiler - ✔✔ELECTRODE
✔✔A high voltage steam electrode has voltage between _____ AND_________ -
✔✔2300 and 15000 Volts
✔✔A high voltage steam electrode boiler has ___ generating compartments; one for
each phase. - ✔✔3
✔✔The capacity of a safety valve on an electric boiler is __ lbs per KW or ___ btus per
hr per KW - ✔✔3.5 LBS - 3500btus per KW
✔✔An HTHW system has better temp control becauase it has a large _______
_______ ________. - ✔✔heat storage capacity
✔✔Downtherm thermal liquid systems use ________ _____________ at tubes to
prevent leaking - ✔✔welded joints
✔✔__________ ________ boilers recover heat in the exaust from a gas turbine to
produce usefull steam - ✔✔WASTE HEAT
✔✔When exaust gasses dont have enough energy to produce the final steam pressure
_______ ________ is used. - ✔✔SUPPLEMENTAL FIRING
✔✔A recovery steam generator converts steam energy to mechanical energy to
produce electricity in a ________ ________ plant. - ✔✔COMBINED CYCLE
✔✔___________ ___________Sell steam to local industrial plants and surplus electric
to local utilities - ✔✔COGENERATION PLANTS
✔✔Superheated steam is injected into a gas turbine to increase electrical output in the
______ _____________. - ✔✔CHENG CYCLE
✔✔Waste products from sugar cane are used in a BAGASSE plant. When dried it has a
heating value of ________ to _________ btus per lb - ✔✔8000 to 8700 btus per lb
✔✔Black Liquor boilers are known for - ✔✔STEAM GENERATION and production of
SODA ASH
✔✔For black liquor boilers to sustain combustion - ✔✔they must contain _______%
solids.
, ✔✔Three types of ATMOSPHRIC BED BOILERS - ✔✔1.) BUBBLING 2.) DEEP 3.)
CIRCULATING FLUIDIZED BED
✔✔Minimum and Maximum size of a blowdown are - ✔✔3/4"min - 2 1/2"max
✔✔Ratio of heat output to heat imput - ✔✔BOILER EFFICIENCY
✔✔Pressure relief valve on a hot water boiler must be at least ___" diameter and no
more than _____" in diameter - ✔✔3/4" - 4 1/2"
✔✔Two types of headers in early watertube boilers - ✔✔SINUOUS or BOX
✔✔Volume of a cylinder - ✔✔V = (D X D X .7854) X H
✔✔Boiler Horse Power formula. - ✔✔Lbs per hr X factor of evaporation divided by 34.5
✔✔Water Column Formula - ✔✔Water coumn = P/.433
✔✔WATER AT ITS BOILING POINT IS CONSIDERED __________ LIQUID -
✔✔SATURATED
✔✔SATURATED STEAM CONTAINS NO _______AND IS NOT _______. - ✔✔LIQUID
- SUPERHEATED
✔✔THE TEMP OF A LIQUID MINUS 32 - ✔✔ENTHALPY
✔✔CRITERIA FOR A MINIATURE BOILER - ✔✔a) 16" DIAMETER b) 5 FT CUBED
GROSS VOLUME c) 100psig OR LESS d) 20 SQUARE FEET OF HEATING SURFACE
✔✔UNLIKE A WATER HEATING BOILER A HOT WATER SUPPLY BOILER DOES
NOT GET ______ ________. - ✔✔RETURN WATER
✔✔SUPERCRITICAL BOILER OPERATES AT 3206 psia OR 705 DEGREES IN A
SUPERCRITICAL BOILER WATER AND STEAM HAVE THE SAME __________. -
✔✔Density
✔✔The _______ __________ turns the burner off when the steam pressure in the
boiler is sufficiently low. - ✔✔operating control
✔✔The maximum voltage on a control circuit is - ✔✔150 Volts
✔✔Flues are specified by their _________ diameter.......Tubes are specified by their
_________diameter - ✔✔inside; outside
AND SOLUTIONS 2025/2026 GRADED A+
✔✔A ________thermometer uses two dissimilar metals that bend predictably with a
change in temp. - ✔✔BIMETALIC
✔✔Minimum size for the connection between the guage glass and the water column is
_______ - ✔✔1/2"
✔✔2 or more saftey valves are required on a boiler with a heating surface inexcess of
______square feet or electric imput of ________KW - ✔✔500 sq ft ; 500KW
✔✔Safetey valves on a superheater should be set _____than the safety valve on the
steam drum - ✔✔lower
✔✔Boiler stop valves over 2 inches in diameter should be ___ _______ ___ ______. -
✔✔OS&Y
✔✔When boiler pressure exceeds _____psi; two blowdown valves must be used; one
must be a slow opening valve - ✔✔100
✔✔Slow opening blowdown valves must complete ___turns between full open and full
shut. - ✔✔5
✔✔A COPES feedwater regulator is an example of a ________ ____________type
feedwater regulator. - ✔✔thermostatic mechanical
✔✔The feedwater control valve position is controlled by the _______ of the fluid as
caused by the temp changes caused by water level changes in the thermostatic tube -
✔✔PRESSURE
✔✔The 3 element feedwater regulator senses ________ _________ AND_________. -
✔✔steam flow - feedwater flow - and water level
✔✔The _______ ________uses boiler water to complete the electrical circuit -
✔✔submerged electrode
✔✔The submerged electrode does not have a __________ _______. - ✔✔mercury
switch
✔✔2 types of electric boilers - ✔✔RESISTANCE and ELECTRODE
,✔✔Electric current flows through the water and converts electrical energy to heat
energy in the ________type boiler - ✔✔ELECTRODE
✔✔A high voltage steam electrode has voltage between _____ AND_________ -
✔✔2300 and 15000 Volts
✔✔A high voltage steam electrode boiler has ___ generating compartments; one for
each phase. - ✔✔3
✔✔The capacity of a safety valve on an electric boiler is __ lbs per KW or ___ btus per
hr per KW - ✔✔3.5 LBS - 3500btus per KW
✔✔An HTHW system has better temp control becauase it has a large _______
_______ ________. - ✔✔heat storage capacity
✔✔Downtherm thermal liquid systems use ________ _____________ at tubes to
prevent leaking - ✔✔welded joints
✔✔__________ ________ boilers recover heat in the exaust from a gas turbine to
produce usefull steam - ✔✔WASTE HEAT
✔✔When exaust gasses dont have enough energy to produce the final steam pressure
_______ ________ is used. - ✔✔SUPPLEMENTAL FIRING
✔✔A recovery steam generator converts steam energy to mechanical energy to
produce electricity in a ________ ________ plant. - ✔✔COMBINED CYCLE
✔✔___________ ___________Sell steam to local industrial plants and surplus electric
to local utilities - ✔✔COGENERATION PLANTS
✔✔Superheated steam is injected into a gas turbine to increase electrical output in the
______ _____________. - ✔✔CHENG CYCLE
✔✔Waste products from sugar cane are used in a BAGASSE plant. When dried it has a
heating value of ________ to _________ btus per lb - ✔✔8000 to 8700 btus per lb
✔✔Black Liquor boilers are known for - ✔✔STEAM GENERATION and production of
SODA ASH
✔✔For black liquor boilers to sustain combustion - ✔✔they must contain _______%
solids.
, ✔✔Three types of ATMOSPHRIC BED BOILERS - ✔✔1.) BUBBLING 2.) DEEP 3.)
CIRCULATING FLUIDIZED BED
✔✔Minimum and Maximum size of a blowdown are - ✔✔3/4"min - 2 1/2"max
✔✔Ratio of heat output to heat imput - ✔✔BOILER EFFICIENCY
✔✔Pressure relief valve on a hot water boiler must be at least ___" diameter and no
more than _____" in diameter - ✔✔3/4" - 4 1/2"
✔✔Two types of headers in early watertube boilers - ✔✔SINUOUS or BOX
✔✔Volume of a cylinder - ✔✔V = (D X D X .7854) X H
✔✔Boiler Horse Power formula. - ✔✔Lbs per hr X factor of evaporation divided by 34.5
✔✔Water Column Formula - ✔✔Water coumn = P/.433
✔✔WATER AT ITS BOILING POINT IS CONSIDERED __________ LIQUID -
✔✔SATURATED
✔✔SATURATED STEAM CONTAINS NO _______AND IS NOT _______. - ✔✔LIQUID
- SUPERHEATED
✔✔THE TEMP OF A LIQUID MINUS 32 - ✔✔ENTHALPY
✔✔CRITERIA FOR A MINIATURE BOILER - ✔✔a) 16" DIAMETER b) 5 FT CUBED
GROSS VOLUME c) 100psig OR LESS d) 20 SQUARE FEET OF HEATING SURFACE
✔✔UNLIKE A WATER HEATING BOILER A HOT WATER SUPPLY BOILER DOES
NOT GET ______ ________. - ✔✔RETURN WATER
✔✔SUPERCRITICAL BOILER OPERATES AT 3206 psia OR 705 DEGREES IN A
SUPERCRITICAL BOILER WATER AND STEAM HAVE THE SAME __________. -
✔✔Density
✔✔The _______ __________ turns the burner off when the steam pressure in the
boiler is sufficiently low. - ✔✔operating control
✔✔The maximum voltage on a control circuit is - ✔✔150 Volts
✔✔Flues are specified by their _________ diameter.......Tubes are specified by their
_________diameter - ✔✔inside; outside
