Boiler operator/ stationary steam engineer exam
questions and answers 2025
what is used to keep SO2 down? - ANSWER wet and dry scrubbers
a wet scrubber that has been maintained properly has the capability of absorbing ______% of
the SO2 in the flue gas - ANSWER 90%
Materials of construction of a flue gas scrubber system must be selected to resist what hostile
conditions? - ANSWER low pH conditions and abrasion
the efficiency of a spray pond or cooling tower is based on? - ANSWER wet bulb temperature or
relative humidity of the ambient air
when placing an induced draft cooling tower into service, which is the last step performed? -
ANSWER start the i.d. fans
when operating an induced draft cooling tower, which of the following statements is FALSE -
ANSWER it is more economical to operate one fan at high speed than two fans at low speed
what condition could be prevented by keeping the pH of water greater than 7? - ANSWER
corrosion
which chemical is often used to control algae accumulation in cooling towers? - ANSWER copper
sulfate
(LP) what is the minimum percentage of oxygen that must be present in a confined space before
entering? - ANSWER 19.5%
, (LP) which of the following should you not tag and lock out when a boiler is shut down for
inspection? - ANSWER top tri cock or boiler vent
what is the first thing that must be done when starting up a brand new boiler? - ANSWER boil
the boiler out
which of the following is not done during a boiler start up? - ANSWER fill the boiler to the NOWL
when starting a fire in a coal_fired boiler with chain grates or traveling grates, how much coal
should be on the grates? - ANSWER 3-4 inches
when should a non-return valve be opened when putting a boiler on line? - ANSWER when the
boiler pressure builds to 10 to 25 pose below the header pressure
if a steam oiler is being taken out of service, what step should be taken first? - ANSWER operate
the sootblowers
(LP) when taking a boiler off-line what is the first step? - ANSWER secure the fire
what is the last step to be performed when shutting down a boiler? - ANSWER close the
feedwater supply valve
when taking a boiler out of service, what is one thing you do not do? - ANSWER close the vent
how long may the operator be away from the boiler - ANSWER the time it takes to go from 1/2
sight glass of water to no water showing
questions and answers 2025
what is used to keep SO2 down? - ANSWER wet and dry scrubbers
a wet scrubber that has been maintained properly has the capability of absorbing ______% of
the SO2 in the flue gas - ANSWER 90%
Materials of construction of a flue gas scrubber system must be selected to resist what hostile
conditions? - ANSWER low pH conditions and abrasion
the efficiency of a spray pond or cooling tower is based on? - ANSWER wet bulb temperature or
relative humidity of the ambient air
when placing an induced draft cooling tower into service, which is the last step performed? -
ANSWER start the i.d. fans
when operating an induced draft cooling tower, which of the following statements is FALSE -
ANSWER it is more economical to operate one fan at high speed than two fans at low speed
what condition could be prevented by keeping the pH of water greater than 7? - ANSWER
corrosion
which chemical is often used to control algae accumulation in cooling towers? - ANSWER copper
sulfate
(LP) what is the minimum percentage of oxygen that must be present in a confined space before
entering? - ANSWER 19.5%
, (LP) which of the following should you not tag and lock out when a boiler is shut down for
inspection? - ANSWER top tri cock or boiler vent
what is the first thing that must be done when starting up a brand new boiler? - ANSWER boil
the boiler out
which of the following is not done during a boiler start up? - ANSWER fill the boiler to the NOWL
when starting a fire in a coal_fired boiler with chain grates or traveling grates, how much coal
should be on the grates? - ANSWER 3-4 inches
when should a non-return valve be opened when putting a boiler on line? - ANSWER when the
boiler pressure builds to 10 to 25 pose below the header pressure
if a steam oiler is being taken out of service, what step should be taken first? - ANSWER operate
the sootblowers
(LP) when taking a boiler off-line what is the first step? - ANSWER secure the fire
what is the last step to be performed when shutting down a boiler? - ANSWER close the
feedwater supply valve
when taking a boiler out of service, what is one thing you do not do? - ANSWER close the vent
how long may the operator be away from the boiler - ANSWER the time it takes to go from 1/2
sight glass of water to no water showing
