STATIONARY ENGINEER QUESTIONS
AND VERIFIED ANSWERS 100%
GUARANTEE PASS
uHow much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of
steam? - 7 feet
On a gas fired boiler what is the proper gas to air mixture - 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? - 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? - Once a Shift
With 24 hr operation how often do you check the water level? - Once per shift
How often do you check the LWCO? - Once per shift
How often do you check the High Limit Switch? - 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? - GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
What controls the amount of blowback on a safety valve? - Blowback ring or adjusting ring
On a open air expansion tank hot water boiler system; how high should it be mounted? - (4 Feet ) above
the highest heating element.
,What is the minimum top clearance of boilers with manholes? - 5 feet
Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of?
- 2 feet from ceiling. Code chapter 10 page76
Most important safety device on a boiler? - Safety relief valve
What does a Black Liquor Boiler do? - Black Liquor is the by product of wood pulp processing in the
paper making industry.
What does Black liquor boiler known for? - Steam generation and recovery of soda ash
Maximum line voltage for control on a boiler? - 150 volts
Under what code are boilers designed and constructed? - 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 - 1 LWCO is needed.
What is the minimum and maximum size for a safety valve per code for boilers? - Minimum 3/4" and
Maximum 4 1/2"
What stamp is put on a boiler after repairs? - "R"
What is the equalizing system used for? - 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 - 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? - Electronic
After opening a boiler for repairs how much oxygen is needed? - 19%
What is the first thing you do when shutting down a boiler? - Turn off (extinguish fire)
What is the legal limit of acceptable asbestos particles ? - 0.1 fibers per cubic centimeter
What is CREEP? - 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? - 14000 btu/lb
What substance transfers electrical current in a photocell? - 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? - 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? - 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? - 6 inches
What device is used to measure flue gasses - The Orsat Analyzer
Which low water cut off does not have a mercury switch? - The Submerged electrode type
, What is the btu output per lb of #4 fuel oil? - 18
What substance is used for the electric transmission in an RTD? - Platinum is used because of its stability
at high temperatures
How much air is needed for the combustion of pulverized coal; gas; oil? - 50% for coal and 10-30% for
gas & oil
In old power boilers which type of feedwater regulators were not used? \n(A) hydraulic \n(B) float \n(C)
thermostatic expansion \n(D) electronic - ANSWER D electronic/electro-magnetic
What is hard forming scale? - Silica
With hydroxide present and normal oxygen levels which chemical will cause problems? - Chlorine
The result from steel manufacturing and under pressure in boilers tends to cause buldging? A buldge is
caused by ? - A buldge is caused by overheating of the shell plates and it affects the entire thickness of
the plate.
A blister is caused by what ? - Slag inclusion forming a lamination at the time the plate was rolled at the
steel mill. A blister is a separation of the metal from the shell plate caused by impurities rolled into the
shell plate when formed.
With normal oxygen and low alkalinity. what is added to the boiler water? - Neutralizing Amines
Which chemical is used to combat scale? - Combined phosphate treatment- sodium phosphate
Other than sulfite what chemical is used to combat corrosion in boilers? - Hydrazine
What will neutralize acid? - Alkali and Lime Soda
AND VERIFIED ANSWERS 100%
GUARANTEE PASS
uHow much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of
steam? - 7 feet
On a gas fired boiler what is the proper gas to air mixture - 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? - 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? - Once a Shift
With 24 hr operation how often do you check the water level? - Once per shift
How often do you check the LWCO? - Once per shift
How often do you check the High Limit Switch? - 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? - GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
What controls the amount of blowback on a safety valve? - Blowback ring or adjusting ring
On a open air expansion tank hot water boiler system; how high should it be mounted? - (4 Feet ) above
the highest heating element.
,What is the minimum top clearance of boilers with manholes? - 5 feet
Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of?
- 2 feet from ceiling. Code chapter 10 page76
Most important safety device on a boiler? - Safety relief valve
What does a Black Liquor Boiler do? - Black Liquor is the by product of wood pulp processing in the
paper making industry.
What does Black liquor boiler known for? - Steam generation and recovery of soda ash
Maximum line voltage for control on a boiler? - 150 volts
Under what code are boilers designed and constructed? - 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 - 1 LWCO is needed.
What is the minimum and maximum size for a safety valve per code for boilers? - Minimum 3/4" and
Maximum 4 1/2"
What stamp is put on a boiler after repairs? - "R"
What is the equalizing system used for? - 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 - 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? - Electronic
After opening a boiler for repairs how much oxygen is needed? - 19%
What is the first thing you do when shutting down a boiler? - Turn off (extinguish fire)
What is the legal limit of acceptable asbestos particles ? - 0.1 fibers per cubic centimeter
What is CREEP? - 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? - 14000 btu/lb
What substance transfers electrical current in a photocell? - 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? - 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? - 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? - 6 inches
What device is used to measure flue gasses - The Orsat Analyzer
Which low water cut off does not have a mercury switch? - The Submerged electrode type
, What is the btu output per lb of #4 fuel oil? - 18
What substance is used for the electric transmission in an RTD? - Platinum is used because of its stability
at high temperatures
How much air is needed for the combustion of pulverized coal; gas; oil? - 50% for coal and 10-30% for
gas & oil
In old power boilers which type of feedwater regulators were not used? \n(A) hydraulic \n(B) float \n(C)
thermostatic expansion \n(D) electronic - ANSWER D electronic/electro-magnetic
What is hard forming scale? - Silica
With hydroxide present and normal oxygen levels which chemical will cause problems? - Chlorine
The result from steel manufacturing and under pressure in boilers tends to cause buldging? A buldge is
caused by ? - A buldge is caused by overheating of the shell plates and it affects the entire thickness of
the plate.
A blister is caused by what ? - Slag inclusion forming a lamination at the time the plate was rolled at the
steel mill. A blister is a separation of the metal from the shell plate caused by impurities rolled into the
shell plate when formed.
With normal oxygen and low alkalinity. what is added to the boiler water? - Neutralizing Amines
Which chemical is used to combat scale? - Combined phosphate treatment- sodium phosphate
Other than sulfite what chemical is used to combat corrosion in boilers? - Hydrazine
What will neutralize acid? - Alkali and Lime Soda
