DC BOILER STATIONERY THIRD TESTING
ACTUAL EXAM 2025 WITH REAL 200+
QUESTIONS AND VERIFIED CORRECT
ANSWERS | ALREADY GRADED A+ |
GUARANTEED PASS | DC BOILER STATIONERY
LATEST FINAL EXAM 2025 [BRAND NEW!!]
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- The Globe
What is the acceptable range for residual sodium sulfite in the boiler maintenance?
- ANSWER- 30-70
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? - ANSWER- 160 (10 x 24 x 2/3 ) =160
In a dual duct air handling system space thermostatic control building temperature
by? - ANSWER- Moving the air from the hot & cold duct in a molding box
serving the space
,A boiler is rated at (86,250 lbs, 88,250 lbs, 96,250 lbs) of steam per hour. What is
the equivalent boiler horsepower? - ANSWER- 2500 HP = 86,.5 = 2500
lbs
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? - ANSWER- 160 (10 x 24 x 2/3 ) =160
What is the total force acting on a 4 inches diameter safety value disc with a boiler
pressure of 12 psi? - ANSWER- 150.79 TF = 150.79
The expansion tank on a closed loop system should be located? - ANSWER- On
the suction side of the pump
What is the primary purpose of a crank case heater on a reciprocating chiller? -
ANSWER- To prevent refrigeration migration
What is meant by the percent of (skip, step, and slip) in a pump? - ANSWER-
Percentage of flow compared minimum speed and full speed
e. The difference in theoretical capacity compared to the actual capacity
Which of the following types pump can be started with the discharge value closed?
- ANSWER- Centrifugal
The vertical distance from the center line of the pump up to top level of the supply
tank is called? - ANSWER- Static suction head
In a multi-zone air handling unit, the zone thermostat controls the zone temperature
by? - ANSWER- Dampers that control the air flow from the hot & cold deck
,What is meant by a pump becoming steam bound? - ANSWER- When the static
pressure at the suction of the pump falls below the vapor pressure corresponding to
its temperature.
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- Backwash
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 nozzle-type 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
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: - ANSWER- (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 - ANSWER- 250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_________at
ACTUAL EXAM 2025 WITH REAL 200+
QUESTIONS AND VERIFIED CORRECT
ANSWERS | ALREADY GRADED A+ |
GUARANTEED PASS | DC BOILER STATIONERY
LATEST FINAL EXAM 2025 [BRAND NEW!!]
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- The Globe
What is the acceptable range for residual sodium sulfite in the boiler maintenance?
- ANSWER- 30-70
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? - ANSWER- 160 (10 x 24 x 2/3 ) =160
In a dual duct air handling system space thermostatic control building temperature
by? - ANSWER- Moving the air from the hot & cold duct in a molding box
serving the space
,A boiler is rated at (86,250 lbs, 88,250 lbs, 96,250 lbs) of steam per hour. What is
the equivalent boiler horsepower? - ANSWER- 2500 HP = 86,.5 = 2500
lbs
What is the area of a steam engine cylinder reading 10 x 24, when the piston is
only travelling at 2/3 of the way? - ANSWER- 160 (10 x 24 x 2/3 ) =160
What is the total force acting on a 4 inches diameter safety value disc with a boiler
pressure of 12 psi? - ANSWER- 150.79 TF = 150.79
The expansion tank on a closed loop system should be located? - ANSWER- On
the suction side of the pump
What is the primary purpose of a crank case heater on a reciprocating chiller? -
ANSWER- To prevent refrigeration migration
What is meant by the percent of (skip, step, and slip) in a pump? - ANSWER-
Percentage of flow compared minimum speed and full speed
e. The difference in theoretical capacity compared to the actual capacity
Which of the following types pump can be started with the discharge value closed?
- ANSWER- Centrifugal
The vertical distance from the center line of the pump up to top level of the supply
tank is called? - ANSWER- Static suction head
In a multi-zone air handling unit, the zone thermostat controls the zone temperature
by? - ANSWER- Dampers that control the air flow from the hot & cold deck
,What is meant by a pump becoming steam bound? - ANSWER- When the static
pressure at the suction of the pump falls below the vapor pressure corresponding to
its temperature.
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- Backwash
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 nozzle-type 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
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: - ANSWER- (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 - ANSWER- 250 feet / 2.31 = 108.22
A "5" pipe filled with water to a height of 75 feet will have a pressure of
_________at
