Stationary Engineer Exam
Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update
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.
Study Guide – Practice
Questions with Verified
Answers. GRADED A+. Latest
2026/2027 Update
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.
