DC BOILER STATIONARY THIRD TESTING EXAM 2023-2024 ACTUAL EXAM 200
QUESTIONS AND CORRECT DETAILED ANSWERS |AGRADE
The component in which liquid vapor by absorbing heat is called? -
ANSWER-Evaporator
Select the best answer electrical grounding method? - ANSWER-Metal
stake drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - ANSWER-
Globe
What is the acceptable range for residual sodium sulfite in the boiler
maintain? - ANSWER-30-70
What is the BTU content of a gallon of #4? - ANSWER-146,000
What does a zeolite water softener system use as a means of
regeneration? - ANSWER-Brine
What are the 4 steps for a Zeolite Rejuvenation water softener
process? - ANSWER-Back wash
Backwash, brine, rinse, service
,Where is medium temperature is liquid found? - ANSWER-Condenser
Where is high temperature vapor found? - ANSWER-At the discharge
of the compressor or condenser
What stays are used to support the burner chamber in a scotch
marine boiler? - ANSWER-Diagonal Stays
What type of safety valve is this? - ANSWER-( Full) Crosby nozzletype
safety valve. Page 365 BOG
What type of safety valve is this? - ANSWER-( Full) Crosby nozzletype
safety valve. Page 365 BOG
Where do you found superheat reading? - ANSWER-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? - ANSWER-Grounding Electrode Conductor
Where do get sub-cooling reading? - ANSWER-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? - ANSWER-
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? - ANSWER-By opening the Quick
opening valve first and closing it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - ANSWER-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? - ANSWER-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? - ANSWER-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: - ANSWER-D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
D = 0.957938963 * 12
D = 11.49 OR 12 "pipe
QUESTIONS AND CORRECT DETAILED ANSWERS |AGRADE
The component in which liquid vapor by absorbing heat is called? -
ANSWER-Evaporator
Select the best answer electrical grounding method? - ANSWER-Metal
stake drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - ANSWER-
Globe
What is the acceptable range for residual sodium sulfite in the boiler
maintain? - ANSWER-30-70
What is the BTU content of a gallon of #4? - ANSWER-146,000
What does a zeolite water softener system use as a means of
regeneration? - ANSWER-Brine
What are the 4 steps for a Zeolite Rejuvenation water softener
process? - ANSWER-Back wash
Backwash, brine, rinse, service
,Where is medium temperature is liquid found? - ANSWER-Condenser
Where is high temperature vapor found? - ANSWER-At the discharge
of the compressor or condenser
What stays are used to support the burner chamber in a scotch
marine boiler? - ANSWER-Diagonal Stays
What type of safety valve is this? - ANSWER-( Full) Crosby nozzletype
safety valve. Page 365 BOG
What type of safety valve is this? - ANSWER-( Full) Crosby nozzletype
safety valve. Page 365 BOG
Where do you found superheat reading? - ANSWER-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? - ANSWER-Grounding Electrode Conductor
Where do get sub-cooling reading? - ANSWER-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? - ANSWER-
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? - ANSWER-By opening the Quick
opening valve first and closing it Last. Page 403 BOG
ASME Code defines a slow opening valve as what? - ANSWER-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? - ANSWER-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? - ANSWER-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: - ANSWER-D = 12 (C/d/h /.7854)
D = 12 (.037/60) = 3,603.60
D = .ft = 3,927
D = 3.603.,927 = 0.917647058
D = 0.957938963 * 12
D = 11.49 OR 12 "pipe
