MD STATIONARY ENGINEER GRADE 1 EXAM
SCRIPT 2026 COMPREHENSIVE EXAM Q&A
STUDY GUIDE
◉ On a gas fired boiler what is the proper gas to air mixture 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? 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? Answer: Once a Shift
◉ With 24 hr operation how often do you check the water level?
Answer: Once per shift
◉ How often do you check the LWCO? Answer: Once per shift
◉ How often do you check the High Limit Switch? 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? Answer:
GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
◉ What controls the amount of blowback on a safety valve? Answer:
Blowback ring or adjusting ring
◉ On a open air expansion tank hot water boiler system; how high
should it be mounted? Answer: (4 Feet ) above the highest heating
element.
◉ What is the minimum top clearance of boilers with manholes?
Answer: 5 feet
◉ Package boilers; steam heating boilers and hot water heating
boilers shall have a minimum clearance of? Answer: 2 feet from
ceiling. Code chapter 10 page76
◉ Most important safety device on a boiler? Answer: Safety relief
valve
◉ What does a Black Liquor Boiler do? Answer: Black Liquor is the
by product of wood pulp processing in the paper making industry.
,◉ What does Black liquor boiler known for? Answer: Steam
generation and recovery of soda ash
◉ Maximum line voltage for control on a boiler? Answer: 150 volts
◉ Under what code are boilers designed and constructed? 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
Answer: 1 LWCO is needed.
◉ What is the minimum and maximum size for a safety valve per
code for boilers? Answer: Minimum 3/4" and Maximum 4 1/2"
◉ What stamp is put on a boiler after repairs? Answer: "R"
◉ What is the equalizing system used for? 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 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? Answer: Electronic
◉ After opening a boiler for repairs how much oxygen is needed?
Answer: 19%
◉ What is the first thing you do when shutting down a boiler?
Answer: Turn off (extinguish fire)
◉ What is the legal limit of acceptable asbestos particles ? Answer:
0.1 fibers per cubic centimeter
◉ What is CREEP? 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? Answer: 14000
btu/lb
SCRIPT 2026 COMPREHENSIVE EXAM Q&A
STUDY GUIDE
◉ On a gas fired boiler what is the proper gas to air mixture 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? 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? Answer: Once a Shift
◉ With 24 hr operation how often do you check the water level?
Answer: Once per shift
◉ How often do you check the LWCO? Answer: Once per shift
◉ How often do you check the High Limit Switch? 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? Answer:
GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
◉ What controls the amount of blowback on a safety valve? Answer:
Blowback ring or adjusting ring
◉ On a open air expansion tank hot water boiler system; how high
should it be mounted? Answer: (4 Feet ) above the highest heating
element.
◉ What is the minimum top clearance of boilers with manholes?
Answer: 5 feet
◉ Package boilers; steam heating boilers and hot water heating
boilers shall have a minimum clearance of? Answer: 2 feet from
ceiling. Code chapter 10 page76
◉ Most important safety device on a boiler? Answer: Safety relief
valve
◉ What does a Black Liquor Boiler do? Answer: Black Liquor is the
by product of wood pulp processing in the paper making industry.
,◉ What does Black liquor boiler known for? Answer: Steam
generation and recovery of soda ash
◉ Maximum line voltage for control on a boiler? Answer: 150 volts
◉ Under what code are boilers designed and constructed? 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
Answer: 1 LWCO is needed.
◉ What is the minimum and maximum size for a safety valve per
code for boilers? Answer: Minimum 3/4" and Maximum 4 1/2"
◉ What stamp is put on a boiler after repairs? Answer: "R"
◉ What is the equalizing system used for? 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 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? Answer: Electronic
◉ After opening a boiler for repairs how much oxygen is needed?
Answer: 19%
◉ What is the first thing you do when shutting down a boiler?
Answer: Turn off (extinguish fire)
◉ What is the legal limit of acceptable asbestos particles ? Answer:
0.1 fibers per cubic centimeter
◉ What is CREEP? 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? Answer: 14000
btu/lb
