STATIONARY ENGINEER EXAM 600 QUESTIONS &
CORRECT ANSWERS LATEST 2025
How much clearance from the top of the boiler is needed for a HP boiler that
produces 70000 lbs of steam? - ANSWER-7 feet
On a gas fired boiler what is the proper gas to air mixture - ANSWER-30%-70% and
in special arrangements it can be as high as 100% . ANSWER CHAPTER 11
remember%
What is the total hardness in a system that was found to have calcium hardness of
60ppm and magnesium hardness of 18ppm and carbon hardness of 12 ppm? -
ANSWER-TH=(Ca x 2.5) + (Mg x 4.1)\nTH=(60 x 2.5) + (18 x 4.1)\nTH= 150+73.8 =(
223.8 PPM)
How often should a complete external inspection of the boiler be done? -
ANSWER-Once a Shift
With 24 hr operation how often do you check the water level? - ANSWER-Once
per shift
How often do you check the LWCO? - ANSWER-Once per shift
How often do you check the High Limit Switch? - ANSWER-Annually
,A 2" pipe was found to be delivering water at 100 psia at 1040ft per second. How
many gallons per hour will it deliver? - ANSWER-GPM= V (diameter squared)
divided by .4085 ANSWER pg 469 BOG
What controls the amount of blowback on a safety valve? - ANSWER-Blowback
ring or adjusting ring
On a open air expansion tank hot water boiler system; how high should it be
mounted? - ANSWER-(4 Feet ) above the highest heating element.
What is the minimum top clearance of boilers with manholes? - ANSWER-5 feet
Package boilers; steam heating boilers and hot water heating boilers shall have a
minimum clearance of? - ANSWER-2 feet from ceiling. Code chapter 10 page76
Most important safety device on a boiler? - ANSWER-Safety relief valve
What does a Black Liquor Boiler do? - ANSWER-Black Liquor is the by product of
wood pulp processing in the paper making industry.
What does Black liquor boiler known for? - ANSWER-Steam generation and
recovery of soda ash
Maximum line voltage for control on a boiler? - ANSWER-150 volts
Under what code are boilers designed and constructed? - ANSWER-ASME- CSD 1
,How many low water cut offs are needed per code for a hot water system when a
boiler has inputs greater than 400,000 btu per hr - ANSWER-1 LWCO is needed.
What is the minimum and maximum size for a safety valve per code for boilers? -
ANSWER-Minimum 3/4" and Maximum 4 1/2"
What stamp is put on a boiler after repairs? - ANSWER-"R"
What is the equalizing system used for? - ANSWER-The equalizing system is for
warming up the steam lead.
A blowdown valve is located at the lowest water space of a boiler for three
purposes - ANSWER-1. to remove precipitated sludge or loose scale \n2. To
permit rapid lowering of the boiler water if it has become too high accidentally
\n3. As a means of removing water from the boiler so that fresh water may be
added to keep the concentration of solids below the point where difficulties may
be experienced.
In the old power boiler which type of feed-water regulators were not used? -
ANSWER-Electronic
After opening a boiler for repairs how much oxygen is needed? - ANSWER-19%
What is the first thing you do when shutting down a boiler? - ANSWER-Turn off
(extinguish fire)
, What is the legal limit of acceptable asbestos particles ? - ANSWER-0.1 fibers per
cubic centimeter
What is CREEP? - ANSWER-Creep is defined as the slow deformation of material
with time; with the deformation taking place at elevated temperatures with no
increase in stress.
What is the BTU content of Anthracite coal? - ANSWER-14000 btu/lb
What substance transfers electrical current in a photocell? - ANSWER-Electricity
will flow when the CADMIUM is exposed to sufficient light.
What device acts as a check valve in both directions and keeps pumps primed? -
ANSWER-FOOT VALVES are used for pumps under suction pressure to prevent
backflow primed? on the suction line.
What protects boilers from explosion in the furnace? - ANSWER-A flame guard
system is an arrangement of flame detection system; interlocks; and relays which
will sense the presence of a proper flame in a furnace and cause fuel to be shut
off to the furnace if a hazardous condition develops (improper flame or
combustion).
What size pipe is used as a header in a boiler operating at 100psi? - ANSWER-6
inches
What device is used to measure flue gasses - ANSWER-The Orsat Analyzer
CORRECT ANSWERS LATEST 2025
How much clearance from the top of the boiler is needed for a HP boiler that
produces 70000 lbs of steam? - ANSWER-7 feet
On a gas fired boiler what is the proper gas to air mixture - ANSWER-30%-70% and
in special arrangements it can be as high as 100% . ANSWER CHAPTER 11
remember%
What is the total hardness in a system that was found to have calcium hardness of
60ppm and magnesium hardness of 18ppm and carbon hardness of 12 ppm? -
ANSWER-TH=(Ca x 2.5) + (Mg x 4.1)\nTH=(60 x 2.5) + (18 x 4.1)\nTH= 150+73.8 =(
223.8 PPM)
How often should a complete external inspection of the boiler be done? -
ANSWER-Once a Shift
With 24 hr operation how often do you check the water level? - ANSWER-Once
per shift
How often do you check the LWCO? - ANSWER-Once per shift
How often do you check the High Limit Switch? - ANSWER-Annually
,A 2" pipe was found to be delivering water at 100 psia at 1040ft per second. How
many gallons per hour will it deliver? - ANSWER-GPM= V (diameter squared)
divided by .4085 ANSWER pg 469 BOG
What controls the amount of blowback on a safety valve? - ANSWER-Blowback
ring or adjusting ring
On a open air expansion tank hot water boiler system; how high should it be
mounted? - ANSWER-(4 Feet ) above the highest heating element.
What is the minimum top clearance of boilers with manholes? - ANSWER-5 feet
Package boilers; steam heating boilers and hot water heating boilers shall have a
minimum clearance of? - ANSWER-2 feet from ceiling. Code chapter 10 page76
Most important safety device on a boiler? - ANSWER-Safety relief valve
What does a Black Liquor Boiler do? - ANSWER-Black Liquor is the by product of
wood pulp processing in the paper making industry.
What does Black liquor boiler known for? - ANSWER-Steam generation and
recovery of soda ash
Maximum line voltage for control on a boiler? - ANSWER-150 volts
Under what code are boilers designed and constructed? - ANSWER-ASME- CSD 1
,How many low water cut offs are needed per code for a hot water system when a
boiler has inputs greater than 400,000 btu per hr - ANSWER-1 LWCO is needed.
What is the minimum and maximum size for a safety valve per code for boilers? -
ANSWER-Minimum 3/4" and Maximum 4 1/2"
What stamp is put on a boiler after repairs? - ANSWER-"R"
What is the equalizing system used for? - ANSWER-The equalizing system is for
warming up the steam lead.
A blowdown valve is located at the lowest water space of a boiler for three
purposes - ANSWER-1. to remove precipitated sludge or loose scale \n2. To
permit rapid lowering of the boiler water if it has become too high accidentally
\n3. As a means of removing water from the boiler so that fresh water may be
added to keep the concentration of solids below the point where difficulties may
be experienced.
In the old power boiler which type of feed-water regulators were not used? -
ANSWER-Electronic
After opening a boiler for repairs how much oxygen is needed? - ANSWER-19%
What is the first thing you do when shutting down a boiler? - ANSWER-Turn off
(extinguish fire)
, What is the legal limit of acceptable asbestos particles ? - ANSWER-0.1 fibers per
cubic centimeter
What is CREEP? - ANSWER-Creep is defined as the slow deformation of material
with time; with the deformation taking place at elevated temperatures with no
increase in stress.
What is the BTU content of Anthracite coal? - ANSWER-14000 btu/lb
What substance transfers electrical current in a photocell? - ANSWER-Electricity
will flow when the CADMIUM is exposed to sufficient light.
What device acts as a check valve in both directions and keeps pumps primed? -
ANSWER-FOOT VALVES are used for pumps under suction pressure to prevent
backflow primed? on the suction line.
What protects boilers from explosion in the furnace? - ANSWER-A flame guard
system is an arrangement of flame detection system; interlocks; and relays which
will sense the presence of a proper flame in a furnace and cause fuel to be shut
off to the furnace if a hazardous condition develops (improper flame or
combustion).
What size pipe is used as a header in a boiler operating at 100psi? - ANSWER-6
inches
What device is used to measure flue gasses - ANSWER-The Orsat Analyzer
