Stationary Engineer Exam Study Guide Questions
And Answers Verified 100% Correct
A blister is caused by what ? - ANSWER -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? -
ANSWER -Neutralizing Amines
Which chemical is used to combat scale? - ANSWER -Combined phosphate
treatment- sodium phosphate
Other than sulfite what chemical is used to combat corrosion in boilers? -
ANSWER -Hydrazine
What will neutralize acid? - ANSWER -Alkali and Lime Soda
What mechanical device is used to remove scale from firetubes? - ANSWER -A
tube rattler or vibrator
What percentage of the pressure should a boiler have before you test the lever of a
safety valve? - ANSWER -75%
Where is internal corrosion most likely to occur on a vertical tube boiler? -
ANSWER -Water leg-Mud leg
What are the minimum and maximum sizes permitted for blow down valves or
connections? - ANSWER -3/4"minimum 2 ½ " maximum
A boiler operating at a pressure of 65lbs. What is the smallest size feed and blow
off connections if the safety valve is set at 90 psi? - ANSWER -½ " feed ¾ " blow
off
How often should water columns and water glass levels be checked on a high
pressure boiler? - ANSWER -(Once A Shift)\nAt the beginning of each shift -
beginning of the work effort
,What takes no actual action chemical part in combustion? - ANSWER -Nitrogen
How many ppm of EDTA are needed to tie up 1ppm of hardness? - ANSWER -
EDTA requires 10ppm of EDTA and 5 NTA to tie up each 1ppm hardness.
On a package boiler; how many ways could cause fire puffs when it is started up?
- ANSWER -6 ways 1-poor starting draft 2-incorrect firebox 3-wrong burner
nozzle 4-lean fire 5- insufficient gas pilot or excessive gas pilot 6-water in the oil
What is the grade of light domestic fuel oil ? - ANSWER -Grade 1 ( Number 1 )
How often should you test the operating control? - ANSWER -Annually
How often should the testing and inspecting of the burner component? - ANSWER
-Annually
A lead sulfite photocell is what type of flame sensor? - ANSWER -Infrared light
sensing
What is the least amount of oxygen needed when a nitrogen blanket is used? -
ANSWER -19%
How should a boiler be prepared for inspection? - ANSWER -Extinguish fire and
allow boiler to cool slowly. Open the blow down and the drain; vent the boiler to
the atmosphere Soot and ashes should be removed from all tubes; shell plates;
heads; seams and every accessible external surface. The blow down should be shut
if any other boiler feeds this line. Manhole - handhole plates and inspection plugs
should be removed. All loose deposits of sludge or 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 inside the boiler. Any scale or oil deposits should be left
for the water treatment specialist to see for analysis. A boiler properly prepared for
inspection should be cool; dry and clean. It is advisable to attach a red tag marked
"person in boiler" to the steam; blowdown; feed and fuel valves and also to the
manhole plate whenever someone is inside a boiler.
What function can a boiler operator contribute to boiler maintenance? - ANSWER
-A) maintain a safe reliable plant B) maintenance and efficient plant C) Inspection
and logging of items that need to be corrected during the next maintenance period
, What are manholes and handholes on a boiler for? - ANSWER -Examination or
cleaning
How do you protect a steam boiler? - ANSWER -Safety valve
How to you protect a pressure vessel? - ANSWER -Pressure relief valve
How do you protect a hot water boiler? - ANSWER -Pressure relief valve
What gages are on a steam boiler? - ANSWER -Water gage glass and pressure
gage
Methods used to control the temperature of a superheater? - ANSWER -Bypass
damper - spray-type desuperheater - attemperator - condenser - tilting burner - flue
gas recirculation
What chemical would you use to prevent hard scale from forming in the boiler
tubes? - ANSWER -Disodium phosphate and trisodium phosphate
What chemical compounds in water cause permanent hardness? - ANSWER -
Calcium sulfate and magnesium sulfate
What factors must be taken into consideration when choosing a control for a
boiler? - ANSWER -6 factors 1. Steam pressure 2. Furnace pressure and draft 3. air
pressure and flow 4. feed water pressure and flow 5. Flue gas flow & composition
6. proper ignition & burner - flame control
How many safety controls shut down a boiler when an unsafe condition occurs? -
ANSWER -7 controls 1. Pressure limit or temperature 2. Low water fuel cutoffs 3.
Flame failure safeguard systems 4. Automatic ignition controls 5. oil and gas fuel
shutoffs/valve controls 6. air and fuel pressure interlock controls 7. feed water
regulating controls
In a steam generating system what is blamed on chemical treatment but is in fact
part of a boiler design? - ANSWER -Poor circulation
Class A Fires??? - ANSWER -Wood - sawdust - paper - rags
Class B Fires?? - ANSWER -Flammable liquids - oils - tars and gasses
, Class C Fires?? - ANSWER -Electrical equipment
What is the minimum clearance required when a boilers capacity is 5 000btus hr
over 1000sq ft heating surface or an imput over 5 000 000 btus hr? - ANSWER -7
feet
Under what code are oil fired boilers and their control systems covered? -
ANSWER -O.F.B 726
A data plate has what information?? - ANSWER -manufacturer - model serial
number - stamp of approval
When working in a boiler work permits should be aquired when? - ANSWER -For
Each Shift
ASME code requires that a LWCO control be tested by evaporation how often?? -
ANSWER -Monthly
ASME CSD1 requires the main gas burner to have what? - ANSWER -2 manual
shutoff valves. pg 81 1004.1 code book
A HYDROSTATIC test is done at what pressure? - ANSWER -1.5 times the
MAWP or 50% over MAWP
How many low water cutoff are needed per code on a hot water system? -
ANSWER -One LWCO is needed when the boiler input is greater than 400 000
btus
What gages are on a steam boiler? - ANSWER -pressure gage - water gage glass
What gages are on a HW boiler? - ANSWER -pressure - Temp
Name three types of low water cutoffs. - ANSWER -1. float magnetic (rod to
magnet to mercury switch) 2. Float linkage- link to mercury switch 3. Submerged
electrode- water
Boilers having more than 500square feet of heating surface should have how many
means of feed water? - ANSWER -2
And Answers Verified 100% Correct
A blister is caused by what ? - ANSWER -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? -
ANSWER -Neutralizing Amines
Which chemical is used to combat scale? - ANSWER -Combined phosphate
treatment- sodium phosphate
Other than sulfite what chemical is used to combat corrosion in boilers? -
ANSWER -Hydrazine
What will neutralize acid? - ANSWER -Alkali and Lime Soda
What mechanical device is used to remove scale from firetubes? - ANSWER -A
tube rattler or vibrator
What percentage of the pressure should a boiler have before you test the lever of a
safety valve? - ANSWER -75%
Where is internal corrosion most likely to occur on a vertical tube boiler? -
ANSWER -Water leg-Mud leg
What are the minimum and maximum sizes permitted for blow down valves or
connections? - ANSWER -3/4"minimum 2 ½ " maximum
A boiler operating at a pressure of 65lbs. What is the smallest size feed and blow
off connections if the safety valve is set at 90 psi? - ANSWER -½ " feed ¾ " blow
off
How often should water columns and water glass levels be checked on a high
pressure boiler? - ANSWER -(Once A Shift)\nAt the beginning of each shift -
beginning of the work effort
,What takes no actual action chemical part in combustion? - ANSWER -Nitrogen
How many ppm of EDTA are needed to tie up 1ppm of hardness? - ANSWER -
EDTA requires 10ppm of EDTA and 5 NTA to tie up each 1ppm hardness.
On a package boiler; how many ways could cause fire puffs when it is started up?
- ANSWER -6 ways 1-poor starting draft 2-incorrect firebox 3-wrong burner
nozzle 4-lean fire 5- insufficient gas pilot or excessive gas pilot 6-water in the oil
What is the grade of light domestic fuel oil ? - ANSWER -Grade 1 ( Number 1 )
How often should you test the operating control? - ANSWER -Annually
How often should the testing and inspecting of the burner component? - ANSWER
-Annually
A lead sulfite photocell is what type of flame sensor? - ANSWER -Infrared light
sensing
What is the least amount of oxygen needed when a nitrogen blanket is used? -
ANSWER -19%
How should a boiler be prepared for inspection? - ANSWER -Extinguish fire and
allow boiler to cool slowly. Open the blow down and the drain; vent the boiler to
the atmosphere Soot and ashes should be removed from all tubes; shell plates;
heads; seams and every accessible external surface. The blow down should be shut
if any other boiler feeds this line. Manhole - handhole plates and inspection plugs
should be removed. All loose deposits of sludge or 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 inside the boiler. Any scale or oil deposits should be left
for the water treatment specialist to see for analysis. A boiler properly prepared for
inspection should be cool; dry and clean. It is advisable to attach a red tag marked
"person in boiler" to the steam; blowdown; feed and fuel valves and also to the
manhole plate whenever someone is inside a boiler.
What function can a boiler operator contribute to boiler maintenance? - ANSWER
-A) maintain a safe reliable plant B) maintenance and efficient plant C) Inspection
and logging of items that need to be corrected during the next maintenance period
, What are manholes and handholes on a boiler for? - ANSWER -Examination or
cleaning
How do you protect a steam boiler? - ANSWER -Safety valve
How to you protect a pressure vessel? - ANSWER -Pressure relief valve
How do you protect a hot water boiler? - ANSWER -Pressure relief valve
What gages are on a steam boiler? - ANSWER -Water gage glass and pressure
gage
Methods used to control the temperature of a superheater? - ANSWER -Bypass
damper - spray-type desuperheater - attemperator - condenser - tilting burner - flue
gas recirculation
What chemical would you use to prevent hard scale from forming in the boiler
tubes? - ANSWER -Disodium phosphate and trisodium phosphate
What chemical compounds in water cause permanent hardness? - ANSWER -
Calcium sulfate and magnesium sulfate
What factors must be taken into consideration when choosing a control for a
boiler? - ANSWER -6 factors 1. Steam pressure 2. Furnace pressure and draft 3. air
pressure and flow 4. feed water pressure and flow 5. Flue gas flow & composition
6. proper ignition & burner - flame control
How many safety controls shut down a boiler when an unsafe condition occurs? -
ANSWER -7 controls 1. Pressure limit or temperature 2. Low water fuel cutoffs 3.
Flame failure safeguard systems 4. Automatic ignition controls 5. oil and gas fuel
shutoffs/valve controls 6. air and fuel pressure interlock controls 7. feed water
regulating controls
In a steam generating system what is blamed on chemical treatment but is in fact
part of a boiler design? - ANSWER -Poor circulation
Class A Fires??? - ANSWER -Wood - sawdust - paper - rags
Class B Fires?? - ANSWER -Flammable liquids - oils - tars and gasses
, Class C Fires?? - ANSWER -Electrical equipment
What is the minimum clearance required when a boilers capacity is 5 000btus hr
over 1000sq ft heating surface or an imput over 5 000 000 btus hr? - ANSWER -7
feet
Under what code are oil fired boilers and their control systems covered? -
ANSWER -O.F.B 726
A data plate has what information?? - ANSWER -manufacturer - model serial
number - stamp of approval
When working in a boiler work permits should be aquired when? - ANSWER -For
Each Shift
ASME code requires that a LWCO control be tested by evaporation how often?? -
ANSWER -Monthly
ASME CSD1 requires the main gas burner to have what? - ANSWER -2 manual
shutoff valves. pg 81 1004.1 code book
A HYDROSTATIC test is done at what pressure? - ANSWER -1.5 times the
MAWP or 50% over MAWP
How many low water cutoff are needed per code on a hot water system? -
ANSWER -One LWCO is needed when the boiler input is greater than 400 000
btus
What gages are on a steam boiler? - ANSWER -pressure gage - water gage glass
What gages are on a HW boiler? - ANSWER -pressure - Temp
Name three types of low water cutoffs. - ANSWER -1. float magnetic (rod to
magnet to mercury switch) 2. Float linkage- link to mercury switch 3. Submerged
electrode- water
Boilers having more than 500square feet of heating surface should have how many
means of feed water? - ANSWER -2
