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Stationary Engineer Exam/628 Complete Q’s and A’s 2024
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Stationary Engineer Exam/628 Complete Q’s and A’s 2024
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Stationary Engineer Exam/628Complete Q’s and A’s 2024
How 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
-What mechanical device is used to remove scale from firetubes? - -A tube
rattler or vibrator
-What percentage of the pressure should a boiler have before you test the
lever of a safety valve? - -75%
-Where is internal corrosion most likely to occur on a vertical tube boiler? - -
Water leg-Mud leg
-What are the minimum and maximum sizes permitted for blow down valves
or connections? - -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? - -½ " feed ¾ " blow
off
-How often should water columns and water glass levels be checked on a
high pressure boiler? - -(Once A Shift)\nAt the beginning of each shift -
beginning of the work effort
-What takes no actual action chemical part in combustion? - -Nitrogen
-How many ppm of EDTA are needed to tie up 1ppm of hardness? - -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? - -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 ? - -Grade 1 ( Number 1 )
-How often should you test the operating control? - -Annually
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