STATIONARY ENGINEER TEST PAPER QUESTIONS AND
SOLUTIONS 2025/2026 GRADED A+
✔✔When working in a boiler work permits should be acquired? - ✔✔For the work shift
✔✔To inspect a boiler they must be what? - ✔✔Be employed either by the state or by
an insurance company licensed to write boiler and pressure vessel insurance in that
jurisdiction
✔✔A boiler should have 1 spring loaded pop-type safety valve and it must exceed the
output lb's per hour & fuel capacity but not raise above - ✔✔5 psi of the MAWP or 6%.
✔✔ASME CSD 1 requires the main gas burners train to have what? - ✔✔2 manual
safety shutoff valves
✔✔Welds must be approved and witnessed who? - ✔✔Authorized inspector
✔✔Hydrostatic test is done at what pressure? - ✔✔150 times the MAWP or 50% over
MAWP
✔✔During a hydro test if the boiler leaks who do you notify? - ✔✔Authorized boiler
inspector and they will advise you what to do.
✔✔How many low water cut offs are needed per code for hot water boiler systems? -
✔✔When the boiler has an input greater than 400 000 BTU's per hr 1 L.W. cutout is
needed
✔✔What are the minimum and maximum sizes permitted for blowdown valves or
connection? - ✔✔(3/4 min & 2 1/2 max)
✔✔What are the gauges on a hot water boiler? - ✔✔Pressure gauge & temperature
gauge.
✔✔What are the gauges on a steam boiler? - ✔✔Pressure gauge and gauge glass
✔✔A boiler operating at a pressure of 65 lbs; what is the smallest size feed & blow off
connections if the safety valve is set at 90 psi? - ✔✔1/2 feed & 3/4 blow off
✔✔If a boiler has 1" blow down pipe; what diameter should the boiler blow down tank air
vent should be? - ✔✔2.5"
✔✔What are 3 low water cutouts? - ✔✔Float magnet type- it has a plunger on a float
rod an a permanent magnet with a mercury switch; Float-linkage type- a linkage
, connected to a mercury switch; Submerged-electrode type- uses an electrode make the
complete burner circuit
✔✔What does a low water cut out do in a low water condition? - ✔✔Shuts off the fuel
supply when it drops below the visible level
✔✔What is the first indication of low water condition? - ✔✔A red hot crown sheet
✔✔How many low water cutouts are needed for steam & hot water boilers? - ✔✔ONE
✔✔Boiler that exceeds 100 psi must have how many blow downs? - ✔✔TWO
✔✔How many times the safety valve setting should the pressure gauge be? - ✔✔(1 1/2
to 2 times)
✔✔When blowing down the water column you notice the gauge glass slowly returns to
the normal level; this could be indication of what? - ✔✔The bottom of the gauge glass is
clogged and giving a false reading
✔✔How many inches should the lowest visible level in the gauge glass be in a boiler? -
✔✔TWO inches
✔✔What are the minimum gauge glass connection and drain? - ✔✔(1/2 connection and
1/4 drain)
✔✔Blowdown shall not be less than ** or lower than ** of the safety valve? - ✔✔Less
than 2 lbs or lower than 96% of the safety valve.
✔✔Blow down valves fitting should be designed at least ** % greater pressure than the
MAP? - ✔✔25%
✔✔In an old power boiler which type of feed water regulator wouldn't be used? -
✔✔Electronic
✔✔Which low water cut out doesn't have a mercury switch? - ✔✔Electrode probes
(submerged)
✔✔What are 3 types of feedwater regulators? - ✔✔Thermostatic-mechanical regulator;
Thermostatic-fluid type; Float operated style
✔✔What are two types of commonly used feed water pumps? - ✔✔Injectors and
Inspirator
SOLUTIONS 2025/2026 GRADED A+
✔✔When working in a boiler work permits should be acquired? - ✔✔For the work shift
✔✔To inspect a boiler they must be what? - ✔✔Be employed either by the state or by
an insurance company licensed to write boiler and pressure vessel insurance in that
jurisdiction
✔✔A boiler should have 1 spring loaded pop-type safety valve and it must exceed the
output lb's per hour & fuel capacity but not raise above - ✔✔5 psi of the MAWP or 6%.
✔✔ASME CSD 1 requires the main gas burners train to have what? - ✔✔2 manual
safety shutoff valves
✔✔Welds must be approved and witnessed who? - ✔✔Authorized inspector
✔✔Hydrostatic test is done at what pressure? - ✔✔150 times the MAWP or 50% over
MAWP
✔✔During a hydro test if the boiler leaks who do you notify? - ✔✔Authorized boiler
inspector and they will advise you what to do.
✔✔How many low water cut offs are needed per code for hot water boiler systems? -
✔✔When the boiler has an input greater than 400 000 BTU's per hr 1 L.W. cutout is
needed
✔✔What are the minimum and maximum sizes permitted for blowdown valves or
connection? - ✔✔(3/4 min & 2 1/2 max)
✔✔What are the gauges on a hot water boiler? - ✔✔Pressure gauge & temperature
gauge.
✔✔What are the gauges on a steam boiler? - ✔✔Pressure gauge and gauge glass
✔✔A boiler operating at a pressure of 65 lbs; what is the smallest size feed & blow off
connections if the safety valve is set at 90 psi? - ✔✔1/2 feed & 3/4 blow off
✔✔If a boiler has 1" blow down pipe; what diameter should the boiler blow down tank air
vent should be? - ✔✔2.5"
✔✔What are 3 low water cutouts? - ✔✔Float magnet type- it has a plunger on a float
rod an a permanent magnet with a mercury switch; Float-linkage type- a linkage
, connected to a mercury switch; Submerged-electrode type- uses an electrode make the
complete burner circuit
✔✔What does a low water cut out do in a low water condition? - ✔✔Shuts off the fuel
supply when it drops below the visible level
✔✔What is the first indication of low water condition? - ✔✔A red hot crown sheet
✔✔How many low water cutouts are needed for steam & hot water boilers? - ✔✔ONE
✔✔Boiler that exceeds 100 psi must have how many blow downs? - ✔✔TWO
✔✔How many times the safety valve setting should the pressure gauge be? - ✔✔(1 1/2
to 2 times)
✔✔When blowing down the water column you notice the gauge glass slowly returns to
the normal level; this could be indication of what? - ✔✔The bottom of the gauge glass is
clogged and giving a false reading
✔✔How many inches should the lowest visible level in the gauge glass be in a boiler? -
✔✔TWO inches
✔✔What are the minimum gauge glass connection and drain? - ✔✔(1/2 connection and
1/4 drain)
✔✔Blowdown shall not be less than ** or lower than ** of the safety valve? - ✔✔Less
than 2 lbs or lower than 96% of the safety valve.
✔✔Blow down valves fitting should be designed at least ** % greater pressure than the
MAP? - ✔✔25%
✔✔In an old power boiler which type of feed water regulator wouldn't be used? -
✔✔Electronic
✔✔Which low water cut out doesn't have a mercury switch? - ✔✔Electrode probes
(submerged)
✔✔What are 3 types of feedwater regulators? - ✔✔Thermostatic-mechanical regulator;
Thermostatic-fluid type; Float operated style
✔✔What are two types of commonly used feed water pumps? - ✔✔Injectors and
Inspirator
