DC Third testing Exam Questions and
Answers (Latest Update 2024)
The component in which liquid vapor by absorbing heat is
called? - Correct Answer ✅Evaporator
Select the best answer electrical grounding method? -
Correct Answer ✅Metal stake drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - Correct
Answer ✅Globe
What is the acceptable range for residual sodium sulfite in
the boiler maintain? - Correct Answer ✅30-70
What is the BTU content of a gallon of #4? - Correct Answer
✅146,000
What does a zeolite water softener system use as a means of
regeneration? - Correct Answer ✅Brine
What are the 4 steps for a Zeolite Rejuvenation water
softener process? - Correct Answer ✅Back wash
,DC Third testing Exam Questions and
Answers (Latest Update 2024)
Backwash, brine, rinse, service
Where is medium temperature is liquid found? - Correct
Answer ✅Condenser
Where is high temperature vapor found? - Correct Answer
✅At the discharge of the compressor or condenser
What stays are used to support the burner chamber in a
scotch marine boiler? - Correct Answer ✅Diagonal Stays
What type of safety valve is this? - Correct Answer ✅( Full)
Crosby nozzle-type safety valve. Page 365 BOG
What type of safety valve is this? - Correct Answer ✅( Full)
Crosby nozzle-type safety valve. Page 365 BOG
Where do you found superheat reading? - Correct Answer
✅Take suction line pressure
Cross reference using a P/T Chart
,DC Third testing Exam Questions and
Answers (Latest Update 2024)
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? - Correct Answer
✅Grounding Electrode Conductor
Where do get sub-cooling reading? - Correct 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?
- Correct Answer ✅Closest to the boiler and followed by
the screw type valve
, DC Third testing Exam Questions and
Answers (Latest Update 2024)
High pressure boilers equipped with Quick opening and Screw
type valves are blown down how? - Correct Answer ✅By
opening the Quick opening valve first and closing it Last.
Page 403 BOG
ASME Code defines a slow opening valve as what? - Correct
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? - Correct 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
Answers (Latest Update 2024)
The component in which liquid vapor by absorbing heat is
called? - Correct Answer ✅Evaporator
Select the best answer electrical grounding method? -
Correct Answer ✅Metal stake drive 8 foot into the ground.
A _____ valve should be used for throttling purpose? - Correct
Answer ✅Globe
What is the acceptable range for residual sodium sulfite in
the boiler maintain? - Correct Answer ✅30-70
What is the BTU content of a gallon of #4? - Correct Answer
✅146,000
What does a zeolite water softener system use as a means of
regeneration? - Correct Answer ✅Brine
What are the 4 steps for a Zeolite Rejuvenation water
softener process? - Correct Answer ✅Back wash
,DC Third testing Exam Questions and
Answers (Latest Update 2024)
Backwash, brine, rinse, service
Where is medium temperature is liquid found? - Correct
Answer ✅Condenser
Where is high temperature vapor found? - Correct Answer
✅At the discharge of the compressor or condenser
What stays are used to support the burner chamber in a
scotch marine boiler? - Correct Answer ✅Diagonal Stays
What type of safety valve is this? - Correct Answer ✅( Full)
Crosby nozzle-type safety valve. Page 365 BOG
What type of safety valve is this? - Correct Answer ✅( Full)
Crosby nozzle-type safety valve. Page 365 BOG
Where do you found superheat reading? - Correct Answer
✅Take suction line pressure
Cross reference using a P/T Chart
,DC Third testing Exam Questions and
Answers (Latest Update 2024)
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? - Correct Answer
✅Grounding Electrode Conductor
Where do get sub-cooling reading? - Correct 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?
- Correct Answer ✅Closest to the boiler and followed by
the screw type valve
, DC Third testing Exam Questions and
Answers (Latest Update 2024)
High pressure boilers equipped with Quick opening and Screw
type valves are blown down how? - Correct Answer ✅By
opening the Quick opening valve first and closing it Last.
Page 403 BOG
ASME Code defines a slow opening valve as what? - Correct
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? - Correct 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
