2024/2025 update DC Third Testing Questions
With Complete Solutions
1.The component in which liquid vapor by absorbing heat is
called?: evapo- rator
2.the best answer for an electrical grounding method?: Metal
stake drive 8 foot into the ground.
3.A valve should be used for throttling purposes?: Globe
4.What is the acceptable range for residual sodium sulfite in
the boiler main- tain?: 30-70
5.What is the BTU content of a gallon of #4 fuel oil?: 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?: -
Backwash, Brine, Rinse, Service
8.Where medium temperature 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 get superheat reading?: Take suction line pressure
13.Name the wire that connects all component of a system
,to a physical ground or water pipe?: Grounding electrode
conductor
14.Where do you 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.
, 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.
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
With Complete Solutions
1.The component in which liquid vapor by absorbing heat is
called?: evapo- rator
2.the best answer for an electrical grounding method?: Metal
stake drive 8 foot into the ground.
3.A valve should be used for throttling purposes?: Globe
4.What is the acceptable range for residual sodium sulfite in
the boiler main- tain?: 30-70
5.What is the BTU content of a gallon of #4 fuel oil?: 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?: -
Backwash, Brine, Rinse, Service
8.Where medium temperature 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 get superheat reading?: Take suction line pressure
13.Name the wire that connects all component of a system
,to a physical ground or water pipe?: Grounding electrode
conductor
14.Where do you 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.
, 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.
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
