2014 update DC Third testing Questions And
Answers
The component in which liquid vapor by absorbing heat is called? - (correct answer) -Evaporator
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Select the best answer electrical grounding method? - (correct answer) -Metal stake drive 8 foot into
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the ground.
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A _____ valve should be used for throttling purpose? - (correct answer) -Globe
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What is the acceptable range for residual sodium sulfite in the boiler maintain? - (correct answer) -30-
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70
What is the BTU content of a gallon of #4? - (correct answer) -146,000
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What does a zeolite water softener system use as a means of regeneration? - (correct answer) -Brine
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What are the 4 steps for a Zeolite Rejuvenation water softener process? - (correct answer) -Back wash
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hi Backwash, brine, rinse, service hi hi hi
Where is medium temperature is liquid found? - (correct answer) -Condenser
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Where is high temperature vapor found? - (correct answer) -At the discharge of the compressor or
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condenser
hi
What stays are used to support the burner chamber in a scotch marine boiler? - (correct answer) -
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Diagonal Stays hi
What type of safety valve is this? - (correct answer) -( Full) Crosby nozzle-type safety valve. Page 365
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BOG
hi
What type of safety valve is this? - (correct answer) -( Full) Crosby nozzle-type safety valve. Page 365
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BOG
hi
Where do you found superheat reading? - (correct answer) -Take suction line pressure
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hi Cross reference using a P/T Chart
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hi Get tail coil Temperature
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,hi Subtract cross references temperature from tail coil temperature
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hi Result will be superheat hi hi hi
Name the wire that connects all component of a system to a physical ground or water pipe? - (correct
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answer) -Grounding Electrode Conductor
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Where do get sub-cooling reading? - (correct answer) -Take liquid line pressure
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hi Cross reference to temperature using a P/T Chart
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hi Get liquid line temperature
hi hi hi
Subtract actual temperature from cross referenced temperature
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hi Result is sub-cooling hi hi
On the boilers that have both Quick opening and Screw type blow down valves, the Quick opening
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valve must be located? - (correct answer) -Closest to the boiler and followed by the screw type valve
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High pressure boilers equipped with Quick opening and Screw type valves are blown down how? -
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(correct answer) -By opening the Quick opening valve first and closing it Last. Page 403 BOG
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ASME Code defines a slow opening valve as what? - (correct answer) -One requiring at least 5 full 360
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degree turns between full open and close position. Page 374
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A 300 Horsepower boiler operating at 100psi has an average load of 75% with 80% condensate return
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and 5% blow down. The treatment provides a chemical which costs $8.75 per gallon, and will treat
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600 gallon. Find the amount of the chemical needed for the day period, and the cost of the chemical
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for a 30 days period? - (correct answer) -Water In = Water Out
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Makeup + Condensate Return = Evaporator + Blow Downhi hi hi hi hi hi hi hi
Average Evaporator Rate = 300 x 34.5 pph x .75% load = 7762, 50 pph
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1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
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1 Month + 6210 pph = 7762.50 pph + .0500 m
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hi -6210 -6210 hi
1 Month = 1552.5 pph + .0500
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, .9500 m = 1552.5 pph hi hi hi hi
.9500m .9500 hi
1Month = 1,634.21 pph hi hi hi
Gallons per Month = 1634..33 x 24 x 30 = 141, 252.24 gallons per month
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Chemical needed = 141,252.24 gallon / 600 gallon = 235, 40 gallon
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Cost per month = 235, 40 gallon x 8.75 = $2,059.75
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During a 24 hours operation how often should you check the water level? - (correct answer) -Once per
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shift
hi
A 15 psi steam boiler produces 8000 pound of steam per hour. The
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hi Minimum pipe size for the pipe leaving the boiler is___12__inches.
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hi (Density is 0.037 lbs/ft3) hi hi hi
hi Equation: - (correct answer) -D = 12 (C/d/h /.7854) hi hi hi hi hi hi hi hi
hi D = 12 (.037/60) = 3,603.60
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hi D = .ft = 3,927
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hi D = 3.603.,927 = 0.917647058
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hi D = 0.957938963 * 12
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hi D = 11.49 OR 12 "pipe
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The boiler steam line is 350 Feet long. During start-up the pipe is heated
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hi From 60 F to 350 F. The 350 F. The pipe wills expand__7.92__inches
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hi Due to the change in temperature
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hi Equation: - (correct answer) -(T 1 - T2) x L x .0000065
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hi (350 - 60) x 350 x .0000065
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Answers
The component in which liquid vapor by absorbing heat is called? - (correct answer) -Evaporator
hi hi hi hi hi hi hi hi hi hi hi hi hi hi
Select the best answer electrical grounding method? - (correct answer) -Metal stake drive 8 foot into
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
the ground.
hi hi
A _____ valve should be used for throttling purpose? - (correct answer) -Globe
hi hi hi hi hi hi hi hi hi hi hi hi
What is the acceptable range for residual sodium sulfite in the boiler maintain? - (correct answer) -30-
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
70
What is the BTU content of a gallon of #4? - (correct answer) -146,000
hi hi hi hi hi hi hi hi hi hi hi hi hi
What does a zeolite water softener system use as a means of regeneration? - (correct answer) -Brine
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
What are the 4 steps for a Zeolite Rejuvenation water softener process? - (correct answer) -Back wash
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
hi Backwash, brine, rinse, service hi hi hi
Where is medium temperature is liquid found? - (correct answer) -Condenser
hi hi hi hi hi hi hi hi hi hi
Where is high temperature vapor found? - (correct answer) -At the discharge of the compressor or
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
condenser
hi
What stays are used to support the burner chamber in a scotch marine boiler? - (correct answer) -
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
Diagonal Stays hi
What type of safety valve is this? - (correct answer) -( Full) Crosby nozzle-type safety valve. Page 365
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
BOG
hi
What type of safety valve is this? - (correct answer) -( Full) Crosby nozzle-type safety valve. Page 365
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
BOG
hi
Where do you found superheat reading? - (correct answer) -Take suction line pressure
hi hi hi hi hi hi hi hi hi hi hi hi
hi Cross reference using a P/T Chart
hi hi hi hi hi
hi Get tail coil Temperature
hi hi hi
,hi Subtract cross references temperature from tail coil temperature
hi hi hi hi hi hi hi
hi Result will be superheat hi hi hi
Name the wire that connects all component of a system to a physical ground or water pipe? - (correct
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
answer) -Grounding Electrode Conductor
hi hi hi hi
Where do get sub-cooling reading? - (correct answer) -Take liquid line pressure
hi hi hi hi hi hi hi hi hi hi hi
hi Cross reference to temperature using a P/T Chart
hi hi hi hi hi hi hi
hi Get liquid line temperature
hi hi hi
Subtract actual temperature from cross referenced temperature
hi hi hi hi hi hi
hi Result is sub-cooling hi hi
On the boilers that have both Quick opening and Screw type blow down valves, the Quick opening
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
valve must be located? - (correct answer) -Closest to the boiler and followed by the screw type valve
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
High pressure boilers equipped with Quick opening and Screw type valves are blown down how? -
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
(correct answer) -By opening the Quick opening valve first and closing it Last. Page 403 BOG
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
ASME Code defines a slow opening valve as what? - (correct answer) -One requiring at least 5 full 360
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
degree turns between full open and close position. Page 374
hi hi hi hi hi hi hi hi hi hi
A 300 Horsepower boiler operating at 100psi has an average load of 75% with 80% condensate return
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
and 5% blow down. The treatment provides a chemical which costs $8.75 per gallon, and will treat
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
600 gallon. Find the amount of the chemical needed for the day period, and the cost of the chemical
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
for a 30 days period? - (correct answer) -Water In = Water Out
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Makeup + Condensate Return = Evaporator + Blow Downhi hi hi hi hi hi hi hi
Average Evaporator Rate = 300 x 34.5 pph x .75% load = 7762, 50 pph
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1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
hi hi hi hi hi hi hi hi hi hi hi
1 Month + 6210 pph = 7762.50 pph + .0500 m
hi hi hi hi hi hi hi hi hi hi
hi -6210 -6210 hi
1 Month = 1552.5 pph + .0500
hi hi hi hi hi hi
, .9500 m = 1552.5 pph hi hi hi hi
.9500m .9500 hi
1Month = 1,634.21 pph hi hi hi
Gallons per Month = 1634..33 x 24 x 30 = 141, 252.24 gallons per month
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Chemical needed = 141,252.24 gallon / 600 gallon = 235, 40 gallon
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Cost per month = 235, 40 gallon x 8.75 = $2,059.75
hi hi hi hi hi hi hi hi hi hi
During a 24 hours operation how often should you check the water level? - (correct answer) -Once per
hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi hi
shift
hi
A 15 psi steam boiler produces 8000 pound of steam per hour. The
hi hi hi hi hi hi hi hi hi hi hi hi
hi Minimum pipe size for the pipe leaving the boiler is___12__inches.
hi hi hi hi hi hi hi hi hi hi
hi (Density is 0.037 lbs/ft3) hi hi hi
hi Equation: - (correct answer) -D = 12 (C/d/h /.7854) hi hi hi hi hi hi hi hi
hi D = 12 (.037/60) = 3,603.60
hi hi hi hi hi hi hi
hi D = .ft = 3,927
hi hi hi hi hi hi
hi D = 3.603.,927 = 0.917647058
hi hi hi hi hi hi
hi D = 0.957938963 * 12
hi hi hi hi
hi D = 11.49 OR 12 "pipe
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The boiler steam line is 350 Feet long. During start-up the pipe is heated
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hi From 60 F to 350 F. The 350 F. The pipe wills expand__7.92__inches
hi hi hi hi hi hi hi hi hi hi hi hi hi
hi Due to the change in temperature
hi hi hi hi hi
hi Equation: - (correct answer) -(T 1 - T2) x L x .0000065
hi hi hi hi hi hi hi hi hi hi hi
hi (350 - 60) x 350 x .0000065
hi hi hi hi hi hi
