DC 3rd Class Test exam with answers
|\ |\ |\ |\ |\ |\
The component in which liquid vapor by absorbing heat is
|\ |\ |\ |\ |\ |\ |\ |\ |\
called?
|\
evaporator
the best answer for an electrical grounding method?
|\ |\ |\ |\ |\ |\ |\
Metal stake drive 8 foot into the ground.
|\ |\ |\ |\ |\ |\ |\
A _____ valve should be used for throttling purposes?
|\ |\ |\ |\ |\ |\ |\ |\
Globe
What is the acceptable range for residual sodium sulfite
|\ |\ |\ |\ |\ |\ |\ |\ |\
in the boiler maintain?
|\ |\ |\
30-70
What is the BTU content of a gallon of #4 fuel oil?
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
146,000
,What does a zeolite water softener system use as a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
means of regeneration?
|\ |\
brine
What are the 4 steps for a Zeolite Rejuvenation water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
softener process? |\
Backwash, Brine, Rinse, Service |\ |\ |\
Where medium temperature liquid found?
|\ |\ |\ |\
Condenser
Where is high temperature vapor found?
|\ |\ |\ |\ |\
At the discharge of the compressor or condenser
|\ |\ |\ |\ |\ |\ |\
What stays are used to support the burner chamber in a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
scotch marine boiler?
|\ |\
Diagonal Stays |\
,What type of safety valve is this?
|\ |\ |\ |\ |\ |\
( Full) Crosby nozzle-type safety valve. Page 365 BOG
|\ |\ |\ |\ |\ |\ |\ |\
Where do you get superheat reading?
|\ |\ |\ |\ |\
Take suction line pressure
|\ |\ |\
Name the wire that connects all component of a system
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to a physical ground or water pipe?
|\ |\ |\ |\ |\ |\
Grounding electrode conductor |\ |\
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 |\ |\ |\
, 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
|\ |\ |\ |\ |\ |\ |\ |\ |\
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.
ASME Code defines a slow opening valve as what?
|\ |\ |\ |\ |\ |\ |\ |\
One requiring at least 5 full 360 degree turns between full
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
open and close position.
|\ |\ |\ |\
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?
|\ |\ |\ |\ |\ |\ |\ |\ |\
|\ |\ |\ |\ |\ |\
The component in which liquid vapor by absorbing heat is
|\ |\ |\ |\ |\ |\ |\ |\ |\
called?
|\
evaporator
the best answer for an electrical grounding method?
|\ |\ |\ |\ |\ |\ |\
Metal stake drive 8 foot into the ground.
|\ |\ |\ |\ |\ |\ |\
A _____ valve should be used for throttling purposes?
|\ |\ |\ |\ |\ |\ |\ |\
Globe
What is the acceptable range for residual sodium sulfite
|\ |\ |\ |\ |\ |\ |\ |\ |\
in the boiler maintain?
|\ |\ |\
30-70
What is the BTU content of a gallon of #4 fuel oil?
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
146,000
,What does a zeolite water softener system use as a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
means of regeneration?
|\ |\
brine
What are the 4 steps for a Zeolite Rejuvenation water
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
softener process? |\
Backwash, Brine, Rinse, Service |\ |\ |\
Where medium temperature liquid found?
|\ |\ |\ |\
Condenser
Where is high temperature vapor found?
|\ |\ |\ |\ |\
At the discharge of the compressor or condenser
|\ |\ |\ |\ |\ |\ |\
What stays are used to support the burner chamber in a
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\ |\
scotch marine boiler?
|\ |\
Diagonal Stays |\
,What type of safety valve is this?
|\ |\ |\ |\ |\ |\
( Full) Crosby nozzle-type safety valve. Page 365 BOG
|\ |\ |\ |\ |\ |\ |\ |\
Where do you get superheat reading?
|\ |\ |\ |\ |\
Take suction line pressure
|\ |\ |\
Name the wire that connects all component of a system
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
to a physical ground or water pipe?
|\ |\ |\ |\ |\ |\
Grounding electrode conductor |\ |\
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 |\ |\ |\
, 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
|\ |\ |\ |\ |\ |\ |\ |\ |\
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.
ASME Code defines a slow opening valve as what?
|\ |\ |\ |\ |\ |\ |\ |\
One requiring at least 5 full 360 degree turns between full
|\ |\ |\ |\ |\ |\ |\ |\ |\ |\
open and close position.
|\ |\ |\ |\
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?
|\ |\ |\ |\ |\ |\ |\ |\ |\
