DC BOILER STATIONARY THIRD TESTING
EXAM 2023-2024 ACTUAL EXAM 200
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES|A+ GRADED
What is the acceptable range for residual sodium sulfite in the boiler maintain? -
{ASNWER}-30-70
What is the BTU content of a gallon of #4? - {ASNWER}-146,000
What does a zeolite water softener system use as a means of regeneration? -
{ASNWER}-Brine
What are the 4 steps for a Zeolite Rejuvenation water softener process? -
{ASNWER}-Back wash
Backwash, brine, rinse, service
Where is medium temperature is liquid found? - {ASNWER}-Condenser
Where is high temperature vapor found? - {ASNWER}-At the discharge of the
compressor or condenser
,What stays are used to support the burner chamber in a scotch marine boiler? -
{ASNWER}-Diagonal Stays
What type of safety valve is this? - {ASNWER}-( Full) Crosby nozzle-type safety
valve. Page 365 BOG
What type of safety valve is this? - {ASNWER}-( Full) Crosby nozzle-type safety
valve. Page 365 BOG
The component in which liquid vapor by absorbing heat is called? - {ASNWER}-
Evaporator
Select the best answer electrical grounding method? - {ASNWER}-Metal stake
drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - {ASNWER}-Globe
Where do you found superheat reading? - {ASNWER}-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? - {ASNWER}-Grounding Electrode Conductor
,Where do get sub-cooling reading? - {ASNWER}-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? - {ASNWER}-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? - {ASNWER}-By opening the Quick opening valve first and
closing it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - {ASNWER}-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? -
{ASNWER}-Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
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? -
{ASNWER}-Once per shift
A 15 psi steam boiler produces 8000 pound of steam per hour. The
Minimum pipe size for the pipe leaving the boiler is___12__inches.
(Density is 0.037 lbs/ft3)
Equation: - {ASNWER}-D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
EXAM 2023-2024 ACTUAL EXAM 200
QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES|A+ GRADED
What is the acceptable range for residual sodium sulfite in the boiler maintain? -
{ASNWER}-30-70
What is the BTU content of a gallon of #4? - {ASNWER}-146,000
What does a zeolite water softener system use as a means of regeneration? -
{ASNWER}-Brine
What are the 4 steps for a Zeolite Rejuvenation water softener process? -
{ASNWER}-Back wash
Backwash, brine, rinse, service
Where is medium temperature is liquid found? - {ASNWER}-Condenser
Where is high temperature vapor found? - {ASNWER}-At the discharge of the
compressor or condenser
,What stays are used to support the burner chamber in a scotch marine boiler? -
{ASNWER}-Diagonal Stays
What type of safety valve is this? - {ASNWER}-( Full) Crosby nozzle-type safety
valve. Page 365 BOG
What type of safety valve is this? - {ASNWER}-( Full) Crosby nozzle-type safety
valve. Page 365 BOG
The component in which liquid vapor by absorbing heat is called? - {ASNWER}-
Evaporator
Select the best answer electrical grounding method? - {ASNWER}-Metal stake
drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - {ASNWER}-Globe
Where do you found superheat reading? - {ASNWER}-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? - {ASNWER}-Grounding Electrode Conductor
,Where do get sub-cooling reading? - {ASNWER}-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? - {ASNWER}-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? - {ASNWER}-By opening the Quick opening valve first and
closing it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - {ASNWER}-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? -
{ASNWER}-Water In = Water Out
Makeup + Condensate Return = Evaporator + Blow Down
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? -
{ASNWER}-Once per shift
A 15 psi steam boiler produces 8000 pound of steam per hour. The
Minimum pipe size for the pipe leaving the boiler is___12__inches.
(Density is 0.037 lbs/ft3)
Equation: - {ASNWER}-D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
