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DC BOILER STATIONARY THIRD TESTING EXAM ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES - A GRADE $9.99
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DC BOILER STATIONARY THIRD TESTING EXAM ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES - A GRADE
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DC BOILER STATIONARY THIRD TESTING EXAM ACTUAL EXAM 200 QUESTIONS AND CORRECT DETAILED ANSWERS WITH RATIONALES - A GRADE

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  • November 14, 2024
  • 27
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • dc boiler stationary third testing exam
  • dc boiler stationary exam

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  • DC BOILER
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Dc Boiler Stationary Third Testing Exam 2024-2025
Actual Exam 200 Questions And Correct Detailed
Answers With Rationales - A Grade
1. The component in which liquid vapor by absorbing heat is called?: Evaporator
2. Select the best answer electrical grounding method?: Metal stake drive 8 foot into
the ground.
3. A _____ valve should be used for throttling purpose?: Globe
4. What is the acceptable range for residual sodium sulfite in the boiler maintain?:
30-70
5. What is the BTU content of a gallon of #4?: 146,000
6. What does a zeolite water softener system use as a means of regeneration?:
Brine
7. What are the 4 steps for a Zeolite Rejuvenation water softener process?: Back
wash
Backwash, brine, rinse, service
8. Where is medium temperature is liquid found?: Condenser
9. Where is high temperature vapor found?: At the discharge of the compressor or
condenser
10. What stays are used to support the burner chamber in a scotch marine boiler?:
Diagonal Stays
11. What type of safety valve is this?: ( Full) Crosby nozzle-type safety valve. Page
365 BOG
12. Where do you found superheat reading?: 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
13. Name the wire that connects all component of a system to a physical ground or
water pipe?: Grounding Electrode Conductor
14. Where do get sub-cooling reading?: 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
15. On the boilers that have both Quick opening and Screw type blow down valves,
the Quick opening valve must be located?: Closest to the boiler and followed by
the screw type valve
16. High pressure boilers equipped with Quick opening and Screw type valves are
blown down how?: By opening the Quick opening valve first and closing it Last.
Page 403 BOG
17 ASME Code defines a slow opening valve as what?: One requiring at least 5 full
360 degree turns between full open and close position. Page 374
18. 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?: 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
19. During a 24 hours operation how often should you check the water level?:
Once per shift
20. 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:: 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
21 The boiler steam line is 350 Feet long. During start-up the pipe is heated
From 60 F to 350 F. The 350 F. The pipe wills expand__7.92__inches
Due to the change in temperature

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