1|Page
DC BOILER STATIONARY THIRD
TESTING EXAM 2025-2026 ACTUAL
EXAM 200 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH
RATIONALES|AGRADE
The component in which liquid vapor by absorbing heat is called? -
(answers)Evaporator
Select the best answer electrical grounding method? - (answers)Metal stake drive
8 foot into the ground.
A _____ valve should be used for throttling purpose? - (answers)Globe
What is the acceptable range for residual sodium sulfite in the boiler maintain? -
(answers)30-70
What is the BTU content of a gallon of #4? - (answers)146,000
What does a zeolite water softener system use as a means of regeneration? -
(answers)Brine
What are the 4 steps for a Zeolite Rejuvenation water softener process? -
(answers)Back wash
Backwash, brine, rinse, service
,2|Page
Where is medium temperature is liquid found? - (answers)Condenser
Where is high temperature vapor found? - (answers)At the discharge of the
compressor or condenser
What stays are used to support the burner chamber in a scotch marine boiler? -
(answers)Diagonal Stays
What type of safety valve is this? - (answers)( Full) Crosby nozzle-type safety
valve. Page 365 BOG
What type of safety valve is this? - (answers)( Full) Crosby nozzle-type safety
valve. Page 365 BOG
Where do you found superheat reading? - (answers)Take suction line pressure
Cross reference using a P/T Chart
Get tail coil Temperature
Subtract cross references temperature from tail coil temperature
Result will be superheat
Name the wire that connects all component of a system to a physical ground or
water pipe? - (answers)Grounding Electrode Conductor
,3|Page
Where do get sub-cooling reading? - (answers)Take liquid line pressure
Cross reference to temperature using a P/T Chart
Get liquid line temperature
Subtract actual temperature from cross referenced temperature
Result is sub-cooling
On the boilers that have both Quick opening and Screw type blow down valves,
the Quick opening valve must be located? - (answers)Closest to the boiler and
followed by the screw type valve
High pressure boilers equipped with Quick opening and Screw type valves are
blown down how? - (answers)By opening the Quick opening valve first and closing
it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - (answers)One requiring at
least 5 full 360 degree turns between full open and close position. Page 374
A 300 Horsepower boiler operating at 100psi has an average load of 75% with
80% condensate return and 5% blow down. The treatment provides a chemical
which costs $8.75 per gallon, and will treat 600 gallon. Find the amount of the
chemical needed for the day period, and the cost of the chemical for a 30 days
period? - (answers)Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
, 4|Page
Average Evaporator Rate = 300 x 34.5 pph x .75% load = 7762, 50 pph
1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
1 Month + 6210 pph = 7762.50 pph + .0500 m
-6210 -6210
1 Month = 1552.5 pph + .0500
.9500 m = 1552.5 pph
.9500m .9500
1Month = 1,634.21 pph
Gallons per Month = 1634..33 x 24 x 30 = 141, 252.24 gallons per month
Chemical needed = 141,252.24 gallon / 600 gallon = 235, 40 gallon
Cost per month = 235, 40 gallon x 8.75 = $2,059.75
During a 24 hours operation how often should you check the water level? -
(answers)Once per shift
A 15 psi steam boiler produces 8000 pound of steam per hour. The
DC BOILER STATIONARY THIRD
TESTING EXAM 2025-2026 ACTUAL
EXAM 200 QUESTIONS AND CORRECT
DETAILED ANSWERS WITH
RATIONALES|AGRADE
The component in which liquid vapor by absorbing heat is called? -
(answers)Evaporator
Select the best answer electrical grounding method? - (answers)Metal stake drive
8 foot into the ground.
A _____ valve should be used for throttling purpose? - (answers)Globe
What is the acceptable range for residual sodium sulfite in the boiler maintain? -
(answers)30-70
What is the BTU content of a gallon of #4? - (answers)146,000
What does a zeolite water softener system use as a means of regeneration? -
(answers)Brine
What are the 4 steps for a Zeolite Rejuvenation water softener process? -
(answers)Back wash
Backwash, brine, rinse, service
,2|Page
Where is medium temperature is liquid found? - (answers)Condenser
Where is high temperature vapor found? - (answers)At the discharge of the
compressor or condenser
What stays are used to support the burner chamber in a scotch marine boiler? -
(answers)Diagonal Stays
What type of safety valve is this? - (answers)( Full) Crosby nozzle-type safety
valve. Page 365 BOG
What type of safety valve is this? - (answers)( Full) Crosby nozzle-type safety
valve. Page 365 BOG
Where do you found superheat reading? - (answers)Take suction line pressure
Cross reference using a P/T Chart
Get tail coil Temperature
Subtract cross references temperature from tail coil temperature
Result will be superheat
Name the wire that connects all component of a system to a physical ground or
water pipe? - (answers)Grounding Electrode Conductor
,3|Page
Where do get sub-cooling reading? - (answers)Take liquid line pressure
Cross reference to temperature using a P/T Chart
Get liquid line temperature
Subtract actual temperature from cross referenced temperature
Result is sub-cooling
On the boilers that have both Quick opening and Screw type blow down valves,
the Quick opening valve must be located? - (answers)Closest to the boiler and
followed by the screw type valve
High pressure boilers equipped with Quick opening and Screw type valves are
blown down how? - (answers)By opening the Quick opening valve first and closing
it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - (answers)One requiring at
least 5 full 360 degree turns between full open and close position. Page 374
A 300 Horsepower boiler operating at 100psi has an average load of 75% with
80% condensate return and 5% blow down. The treatment provides a chemical
which costs $8.75 per gallon, and will treat 600 gallon. Find the amount of the
chemical needed for the day period, and the cost of the chemical for a 30 days
period? - (answers)Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
, 4|Page
Average Evaporator Rate = 300 x 34.5 pph x .75% load = 7762, 50 pph
1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
1 Month + 6210 pph = 7762.50 pph + .0500 m
-6210 -6210
1 Month = 1552.5 pph + .0500
.9500 m = 1552.5 pph
.9500m .9500
1Month = 1,634.21 pph
Gallons per Month = 1634..33 x 24 x 30 = 141, 252.24 gallons per month
Chemical needed = 141,252.24 gallon / 600 gallon = 235, 40 gallon
Cost per month = 235, 40 gallon x 8.75 = $2,059.75
During a 24 hours operation how often should you check the water level? -
(answers)Once per shift
A 15 psi steam boiler produces 8000 pound of steam per hour. The
