Stationary Engineer Test Questions Review with Answers
Rated A
How much clearance from the top of the boiler is What controls the amount of blowback on a
needed for a HP boiler that produces 70000 lbs safety valve? - ANSWER -Blowback ring or
of steam? - ANSWER -7 feet adjusting ring
On a gas fired boiler what is the proper gas to air On a open air expansion tank hot water boiler
mixture - ANSWER -30%-70% and in system; how high should it be mounted? -
special arrangements it can be as high as 100% ANSWER -(4 Feet ) above the highest
. ANSWER CHAPTER 11 remember% heating element.
What is the total hardness in a system that was What is the minimum top clearance of boilers
found to have calcium hardness of 60ppm and with manholes? - ANSWER -5 feet
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 Package boilers; steam heating boilers and hot
4.1)\nTH= 150+73.8 =( 223.8 PPM) water heating boilers shall have a minimum
clearance of? - ANSWER -2 feet from
ceiling. Code chapter 10 page76
How often should a complete external inspection
of the boiler be done? - ANSWER -Once a
Shift Most important safety device on a boiler? -
ANSWER -Safety relief valve
With 24 hr operation how often do you check the
water level? - ANSWER -Once per shift What does a Black Liquor Boiler do? -
ANSWER -Black Liquor is the by product of
wood pulp processing in the paper making
How often do you check the LWCO? - industry.
ANSWER -Once per shift
What does Black liquor boiler known for? -
How often do you check the High Limit Switch? - ANSWER -Steam generation and recovery
ANSWER -Annually of soda ash
A 2" pipe was found to be delivering water at 100 Maximum line voltage for control on a boiler? -
psia at 1040ft per second. How many gallons per ANSWER -150 volts
hour will it deliver? - ANSWER -GPM= V
(diameter squared) divided by .4085 ANSWER
pg 469 BOG Under what code are boilers designed and
constructed? - ANSWER -ASME- CSD 1
,Stationary Engineer Test Questions Review with Answers
Rated A
a boiler? - ANSWER -Turn off (extinguish
How many low water cut offs are needed per fire)
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 legal limit of acceptable asbestos
particles ? - ANSWER -0.1 fibers per cubic
centimeter
What is the minimum and maximum size for a
safety valve per code for boilers? -
ANSWER -Minimum 3/4" and Maximum 4 What is CREEP? - ANSWER -Creep is
1/2" defined as the slow deformation of material with
time; with the deformation taking place at
elevated temperatures with no increase in stress.
What stamp is put on a boiler after repairs? -
ANSWER -"R"
What is the BTU content of Anthracite coal? -
ANSWER -14000 btu/lb
What is the equalizing system used for? -
ANSWER -The equalizing system is for
warming up the steam lead. What substance transfers electrical current in a
photocell? - ANSWER -Electricity will flow
when the CADMIUM is exposed to sufficient light.
A blowdown valve is located at the lowest water
space of a boiler for three purposes -
ANSWER -1. to remove precipitated sludge What device acts as a check valve in both
or loose scale \n2. To permit rapid lowering of directions and keeps pumps primed? -
the boiler water if it has become too high ANSWER -FOOT VALVES are used for
accidentally \n3. As a means of removing water pumps under suction pressure to prevent
from the boiler so that fresh water may be added backflow primed? on the suction line.
to keep the concentration of solids below the
point where difficulties may be experienced.
What protects boilers from explosion in the
furnace? - ANSWER -A flame guard system
In the old power boiler which type of feed-water is an arrangement of flame detection system;
regulators were not used? - ANSWER - interlocks; and relays which will sense the
Electronic 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
After opening a boiler for repairs how much combustion).
oxygen is needed? - ANSWER -19%
What size pipe is used as a header in a boiler
What is the first thing you do when shutting down operating at 100psi? - ANSWER -6 inches
,Stationary Engineer Test Questions Review with Answers
Rated A
pressure in boilers tends to cause buldging? A
buldge is caused by ? - ANSWER -A buldge
What device is used to measure flue gasses - is caused by overheating of the shell plates and it
ANSWER -The Orsat Analyzer affects the entire thickness of the plate.
Which low water cut off does not have a mercury A blister is caused by what ? - ANSWER -
switch? - ANSWER -The Submerged Slag inclusion forming a lamination at the time
electrode type 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
What is the btu output per lb of #4 fuel oil? - when formed.
ANSWER -18
With normal oxygen and low alkalinity. what is
What substance is used for the electric added to the boiler water? - ANSWER -
transmission in an RTD? - ANSWER - Neutralizing Amines
Platinum is used because of its stability at high
temperatures
Which chemical is used to combat scale? -
ANSWER -Combined phosphate treatment-
How much air is needed for the combustion of sodium phosphate
pulverized coal; gas; oil? - ANSWER -50%
for coal and 10-30% for gas & oil
Other than sulfite what chemical is used to
combat corrosion in boilers? - ANSWER -
In old power boilers which type of feedwater Hydrazine
regulators were not used? \n(A) hydraulic \n(B)
float \n(C) thermostatic expansion \n(D)
electronic - ANSWER -ANSWER D What will neutralize acid? - ANSWER -
electronic/electro-magnetic Alkali and Lime Soda
What is hard forming scale? - ANSWER - What mechanical device is used to remove scale
Silica from firetubes? - ANSWER -A tube rattler or
vibrator
With hydroxide present and normal oxygen levels
which chemical will cause problems? - What percentage of the pressure should a boiler
ANSWER -Chlorine have before you test the lever of a safety valve? -
ANSWER -75%
The result from steel manufacturing and under
, Stationary Engineer Test Questions Review with Answers
Rated A
Where is internal corrosion most likely to occur
on a vertical tube boiler? - ANSWER - How often should you test the operating control?
Water leg-Mud leg - ANSWER -Annually
What are the minimum and maximum sizes How often should the testing and inspecting of
permitted for blow down valves or connections? - the burner component? - ANSWER -
ANSWER -3/4"minimum 2 ½ " maximum Annually
A boiler operating at a pressure of 65lbs. What is A lead sulfite photocell is what type of flame
the smallest size feed and blow off connections if sensor? - ANSWER -Infrared light sensing
the safety valve is set at 90 psi? -
ANSWER -½ " feed ¾ " blow off
What is the least amount of oxygen needed when
a nitrogen blanket is used? - ANSWER -
How often should water columns and water glass 19%
levels be checked on a high pressure boiler? -
ANSWER -(Once A Shift)\nAt the beginning
of each shift - beginning of the work effort How should a boiler be prepared for inspection? -
ANSWER -Extinguish fire and allow boiler
to cool slowly. Open the blow down and the
What takes no actual action chemical part in drain; vent the boiler to the atmosphere Soot and
combustion? - ANSWER -Nitrogen ashes should be removed from all tubes; shell
plates; heads; seams and every accessible
external surface. The blow down should be shut if
How many ppm of EDTA are needed to tie up any other boiler feeds this line. Manhole -
1ppm of hardness? - ANSWER -EDTA handhole plates and inspection plugs should be
requires 10ppm of EDTA and 5 NTA to tie up removed. All loose deposits of sludge or
each 1ppm hardness. sediment should be washed out. The blow down
should only be opened when it is certain that
there is no pressure in the line and no one is
On a package boiler; how many ways could inside the boiler. Any scale or oil deposits should
cause fire puffs when it is started up? - be left for the water treatment specialist to see for
ANSWER -6 ways 1-poor starting draft 2- analysis. A boiler properly prepared for inspection
incorrect firebox 3-wrong burner nozzle 4-lean should be cool; dry and clean. It is advisable to
fire 5- insufficient gas pilot or excessive gas pilot attach a red tag marked "person in boiler" to the
6-water in the oil steam; blowdown; feed and fuel valves and also
to the manhole plate whenever someone is inside
a boiler.
What is the grade of light domestic fuel oil ? -
ANSWER -Grade 1 ( Number 1 )
What function can a boiler operator contribute to
boiler maintenance? - ANSWER -A)
Rated A
How much clearance from the top of the boiler is What controls the amount of blowback on a
needed for a HP boiler that produces 70000 lbs safety valve? - ANSWER -Blowback ring or
of steam? - ANSWER -7 feet adjusting ring
On a gas fired boiler what is the proper gas to air On a open air expansion tank hot water boiler
mixture - ANSWER -30%-70% and in system; how high should it be mounted? -
special arrangements it can be as high as 100% ANSWER -(4 Feet ) above the highest
. ANSWER CHAPTER 11 remember% heating element.
What is the total hardness in a system that was What is the minimum top clearance of boilers
found to have calcium hardness of 60ppm and with manholes? - ANSWER -5 feet
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 Package boilers; steam heating boilers and hot
4.1)\nTH= 150+73.8 =( 223.8 PPM) water heating boilers shall have a minimum
clearance of? - ANSWER -2 feet from
ceiling. Code chapter 10 page76
How often should a complete external inspection
of the boiler be done? - ANSWER -Once a
Shift Most important safety device on a boiler? -
ANSWER -Safety relief valve
With 24 hr operation how often do you check the
water level? - ANSWER -Once per shift What does a Black Liquor Boiler do? -
ANSWER -Black Liquor is the by product of
wood pulp processing in the paper making
How often do you check the LWCO? - industry.
ANSWER -Once per shift
What does Black liquor boiler known for? -
How often do you check the High Limit Switch? - ANSWER -Steam generation and recovery
ANSWER -Annually of soda ash
A 2" pipe was found to be delivering water at 100 Maximum line voltage for control on a boiler? -
psia at 1040ft per second. How many gallons per ANSWER -150 volts
hour will it deliver? - ANSWER -GPM= V
(diameter squared) divided by .4085 ANSWER
pg 469 BOG Under what code are boilers designed and
constructed? - ANSWER -ASME- CSD 1
,Stationary Engineer Test Questions Review with Answers
Rated A
a boiler? - ANSWER -Turn off (extinguish
How many low water cut offs are needed per fire)
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 legal limit of acceptable asbestos
particles ? - ANSWER -0.1 fibers per cubic
centimeter
What is the minimum and maximum size for a
safety valve per code for boilers? -
ANSWER -Minimum 3/4" and Maximum 4 What is CREEP? - ANSWER -Creep is
1/2" defined as the slow deformation of material with
time; with the deformation taking place at
elevated temperatures with no increase in stress.
What stamp is put on a boiler after repairs? -
ANSWER -"R"
What is the BTU content of Anthracite coal? -
ANSWER -14000 btu/lb
What is the equalizing system used for? -
ANSWER -The equalizing system is for
warming up the steam lead. What substance transfers electrical current in a
photocell? - ANSWER -Electricity will flow
when the CADMIUM is exposed to sufficient light.
A blowdown valve is located at the lowest water
space of a boiler for three purposes -
ANSWER -1. to remove precipitated sludge What device acts as a check valve in both
or loose scale \n2. To permit rapid lowering of directions and keeps pumps primed? -
the boiler water if it has become too high ANSWER -FOOT VALVES are used for
accidentally \n3. As a means of removing water pumps under suction pressure to prevent
from the boiler so that fresh water may be added backflow primed? on the suction line.
to keep the concentration of solids below the
point where difficulties may be experienced.
What protects boilers from explosion in the
furnace? - ANSWER -A flame guard system
In the old power boiler which type of feed-water is an arrangement of flame detection system;
regulators were not used? - ANSWER - interlocks; and relays which will sense the
Electronic 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
After opening a boiler for repairs how much combustion).
oxygen is needed? - ANSWER -19%
What size pipe is used as a header in a boiler
What is the first thing you do when shutting down operating at 100psi? - ANSWER -6 inches
,Stationary Engineer Test Questions Review with Answers
Rated A
pressure in boilers tends to cause buldging? A
buldge is caused by ? - ANSWER -A buldge
What device is used to measure flue gasses - is caused by overheating of the shell plates and it
ANSWER -The Orsat Analyzer affects the entire thickness of the plate.
Which low water cut off does not have a mercury A blister is caused by what ? - ANSWER -
switch? - ANSWER -The Submerged Slag inclusion forming a lamination at the time
electrode type 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
What is the btu output per lb of #4 fuel oil? - when formed.
ANSWER -18
With normal oxygen and low alkalinity. what is
What substance is used for the electric added to the boiler water? - ANSWER -
transmission in an RTD? - ANSWER - Neutralizing Amines
Platinum is used because of its stability at high
temperatures
Which chemical is used to combat scale? -
ANSWER -Combined phosphate treatment-
How much air is needed for the combustion of sodium phosphate
pulverized coal; gas; oil? - ANSWER -50%
for coal and 10-30% for gas & oil
Other than sulfite what chemical is used to
combat corrosion in boilers? - ANSWER -
In old power boilers which type of feedwater Hydrazine
regulators were not used? \n(A) hydraulic \n(B)
float \n(C) thermostatic expansion \n(D)
electronic - ANSWER -ANSWER D What will neutralize acid? - ANSWER -
electronic/electro-magnetic Alkali and Lime Soda
What is hard forming scale? - ANSWER - What mechanical device is used to remove scale
Silica from firetubes? - ANSWER -A tube rattler or
vibrator
With hydroxide present and normal oxygen levels
which chemical will cause problems? - What percentage of the pressure should a boiler
ANSWER -Chlorine have before you test the lever of a safety valve? -
ANSWER -75%
The result from steel manufacturing and under
, Stationary Engineer Test Questions Review with Answers
Rated A
Where is internal corrosion most likely to occur
on a vertical tube boiler? - ANSWER - How often should you test the operating control?
Water leg-Mud leg - ANSWER -Annually
What are the minimum and maximum sizes How often should the testing and inspecting of
permitted for blow down valves or connections? - the burner component? - ANSWER -
ANSWER -3/4"minimum 2 ½ " maximum Annually
A boiler operating at a pressure of 65lbs. What is A lead sulfite photocell is what type of flame
the smallest size feed and blow off connections if sensor? - ANSWER -Infrared light sensing
the safety valve is set at 90 psi? -
ANSWER -½ " feed ¾ " blow off
What is the least amount of oxygen needed when
a nitrogen blanket is used? - ANSWER -
How often should water columns and water glass 19%
levels be checked on a high pressure boiler? -
ANSWER -(Once A Shift)\nAt the beginning
of each shift - beginning of the work effort How should a boiler be prepared for inspection? -
ANSWER -Extinguish fire and allow boiler
to cool slowly. Open the blow down and the
What takes no actual action chemical part in drain; vent the boiler to the atmosphere Soot and
combustion? - ANSWER -Nitrogen ashes should be removed from all tubes; shell
plates; heads; seams and every accessible
external surface. The blow down should be shut if
How many ppm of EDTA are needed to tie up any other boiler feeds this line. Manhole -
1ppm of hardness? - ANSWER -EDTA handhole plates and inspection plugs should be
requires 10ppm of EDTA and 5 NTA to tie up removed. All loose deposits of sludge or
each 1ppm hardness. sediment should be washed out. The blow down
should only be opened when it is certain that
there is no pressure in the line and no one is
On a package boiler; how many ways could inside the boiler. Any scale or oil deposits should
cause fire puffs when it is started up? - be left for the water treatment specialist to see for
ANSWER -6 ways 1-poor starting draft 2- analysis. A boiler properly prepared for inspection
incorrect firebox 3-wrong burner nozzle 4-lean should be cool; dry and clean. It is advisable to
fire 5- insufficient gas pilot or excessive gas pilot attach a red tag marked "person in boiler" to the
6-water in the oil steam; blowdown; feed and fuel valves and also
to the manhole plate whenever someone is inside
a boiler.
What is the grade of light domestic fuel oil ? -
ANSWER -Grade 1 ( Number 1 )
What function can a boiler operator contribute to
boiler maintenance? - ANSWER -A)
