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Stationary Engineer Exam Questions and Answers. How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of steam? - CORRECT ANSWER 7 feet On a gas fired boiler what is the proper gas to air mixture - CORRECT ANSWER 30%-70% and in special arrangements ...

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  • August 22, 2024
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  • 2024/2025
  • Exam (elaborations)
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  • stationary engineer exam questions and answers

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Stationary Engineer Exam Questions
and Answers.

How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of
steam? - CORRECT ANSWER 7 feet



On a gas fired boiler what is the proper gas to air mixture - CORRECT 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? - CORRECT 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? - CORRECT ANSWER Once a
Shift



With 24 hr operation how often do you check the water level? - CORRECT ANSWER Once per shift



How often do you check the LWCO? - CORRECT ANSWER Once per shift



How often do you check the High Limit Switch? - CORRECT 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? - CORRECT ANSWER GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG



What controls the amount of blowback on a safety valve? - CORRECT ANSWER Blowback ring or
adjusting ring



On a open air expansion tank hot water boiler system; how high should it be mounted? - CORRECT
ANSWER (4 Feet ) above the highest heating element.

,What is the minimum top clearance of boilers with manholes? - CORRECT ANSWER 5 feet



Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of?
- CORRECT ANSWER 2 feet from ceiling. Code chapter 10 page76



Most important safety device on a boiler? - CORRECT ANSWER Safety relief valve



What does a Black Liquor Boiler do? - CORRECT ANSWER Black Liquor is the by product of wood pulp
processing in the paper making industry.



What does Black liquor boiler known for? - CORRECT ANSWER Steam generation and recovery of soda
ash



Maximum line voltage for control on a boiler? - CORRECT ANSWER 150 volts



Under what code are boilers designed and constructed? - CORRECT 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 - CORRECT ANSWER 1 LWCO is needed.



What is the minimum and maximum size for a safety valve per code for boilers? - CORRECT ANSWER
Minimum 3/4" and Maximum 4 1/2"



What stamp is put on a boiler after repairs? - CORRECT ANSWER "R"



What is the equalizing system used for? - CORRECT 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 - CORRECT
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? - CORRECT ANSWER
Electronic



After opening a boiler for repairs how much oxygen is needed? - CORRECT ANSWER 19%



What is the first thing you do when shutting down a boiler? - CORRECT ANSWER Turn off (extinguish fire)



What is the legal limit of acceptable asbestos particles ? - CORRECT ANSWER 0.1 fibers per cubic
centimeter



What is CREEP? - CORRECT 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? - CORRECT ANSWER 14000 btu/lb



What substance transfers electrical current in a photocell? - CORRECT 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? - CORRECT ANSWER
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? - CORRECT ANSWER 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? - CORRECT ANSWER 6 inches

, What device is used to measure flue gasses - CORRECT ANSWER The Orsat Analyzer



Which low water cut off does not have a mercury switch? - CORRECT ANSWER The Submerged electrode
type



What is the btu output per lb of #4 fuel oil? - CORRECT ANSWER 18



What substance is used for the electric transmission in an RTD? - CORRECT ANSWER Platinum is used
because of its stability at high temperatures



How much air is needed for the combustion of pulverized coal; gas; oil? - CORRECT ANSWER 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 - CORRECT ANSWER ANSWER D electronic/electro-magnetic



What is hard forming scale? - CORRECT ANSWER Silica



With hydroxide present and normal oxygen levels which chemical will cause problems? - CORRECT
ANSWER Chlorine



The result from steel manufacturing and under pressure in boilers tends to cause buldging? A buldge is
caused by ? - CORRECT ANSWER 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 ? - CORRECT 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? - CORRECT ANSWER
Neutralizing Amines

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