DC Third Testing Exam 2026-2027 TEST BANK EXAM
\LATEST UPDATE WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS\VERIFIED 100% ALREADY
GRADED A+
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?
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?
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:
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
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 Equation:
(T 1 - T2) x L x .0000065
(350 - 60) x 350 x .0000065
290 x 350 x 12 x .0000065 = 7.92
, A 12" pipe filled with water to a height of 250 feet will have a pressure
of
_________at the bottom of the
pipe? Equation:
P = FT / 2.31
250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_ ____ at
The bottom of the
pipe? Equation:
P = FT / 2.31
75 feet / 2.31 = 32.46
\LATEST UPDATE WITH COMPLETE QUESTIONS AND
CORRECT DETAILED ANSWERS\VERIFIED 100% ALREADY
GRADED A+
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?
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?
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:
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
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 Equation:
(T 1 - T2) x L x .0000065
(350 - 60) x 350 x .0000065
290 x 350 x 12 x .0000065 = 7.92
, A 12" pipe filled with water to a height of 250 feet will have a pressure
of
_________at the bottom of the
pipe? Equation:
P = FT / 2.31
250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_ ____ at
The bottom of the
pipe? Equation:
P = FT / 2.31
75 feet / 2.31 = 32.46
