DC 3rd Class Test exam question with correct
answers
The component in which liquid vapor by evaporator
absorbing heat is called?
the best answer for an electrical grounding Metal stake drive 8 foot into the ground.
method?
A_____valve should be used for throttling Globe
purposes?
What is the acceptable range for residual 30-70
sodium sulfite in the boiler maintain?
What is the BTU content of a gallon of 146,000
#4 fuel oil?
What does a zeolite water softener brine
system use as a means of
regeneration?
,What are the 4 steps for a Zeolite Backwash, Brine, Rinse, Service
Rejuvenation water softener process?
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 Diagonal Stays
burner chamber in a scotch marine
boiler?
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 Grounding electrode conductor
of a system to a physical ground or
water pipe?
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 closest to the boiler and followed by the screw-type valve
opening and Screw type blow down
valves, the Quick opening valve must be
located?
High pressure boilers equipped with Quick By opening the Quick opening valve first and closing it Last.
opening and Screw type valves are blown
down how?
ASME Code defines a slow opening valve as One requiring at least 5 full 360 degree turns between full
what? open and close position.
, A 300 Horsepower boiler operating at Water In = Water Out
100psi has an average load of 75% with 80% Makeup + Condensate Return = Evaporator + Blow Down
condensate return and 5% blow down. The
treatment provides a chemical which costs Average Evaporator Rate = 300 x 34.5 pph x .75% load =
7762,
$8.75 per gallon, and will treat 600 gallon. 50 pph
Find the amount of the chemical needed for
the day period, and the cost of the chemical 1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
for a 30 days period?
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 once per shift
should you check the water level?
How often do you check the high limit Annually
switch?
What is the recommended time for a once per shift
complete external inspection of a boiler?
What is the first thing to do when shutting To turn off the fire
down a boiler?
A flow control should be blown down once per shift
when?
How often should you check the Low Water once per shift
Fuel Cut off?
Why is oil added to the refrigerant? lubrication of the compressor
Keep refrigerant migrating
Recycled and filtered refrigerant can be By the same owner in the same type of equipment
used where?
Data printed on the equipment Stamp of approval from commissioning authority
nameplate would include manufacturer,
model, and
serial number and_________?
answers
The component in which liquid vapor by evaporator
absorbing heat is called?
the best answer for an electrical grounding Metal stake drive 8 foot into the ground.
method?
A_____valve should be used for throttling Globe
purposes?
What is the acceptable range for residual 30-70
sodium sulfite in the boiler maintain?
What is the BTU content of a gallon of 146,000
#4 fuel oil?
What does a zeolite water softener brine
system use as a means of
regeneration?
,What are the 4 steps for a Zeolite Backwash, Brine, Rinse, Service
Rejuvenation water softener process?
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 Diagonal Stays
burner chamber in a scotch marine
boiler?
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 Grounding electrode conductor
of a system to a physical ground or
water pipe?
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 closest to the boiler and followed by the screw-type valve
opening and Screw type blow down
valves, the Quick opening valve must be
located?
High pressure boilers equipped with Quick By opening the Quick opening valve first and closing it Last.
opening and Screw type valves are blown
down how?
ASME Code defines a slow opening valve as One requiring at least 5 full 360 degree turns between full
what? open and close position.
, A 300 Horsepower boiler operating at Water In = Water Out
100psi has an average load of 75% with 80% Makeup + Condensate Return = Evaporator + Blow Down
condensate return and 5% blow down. The
treatment provides a chemical which costs Average Evaporator Rate = 300 x 34.5 pph x .75% load =
7762,
$8.75 per gallon, and will treat 600 gallon. 50 pph
Find the amount of the chemical needed for
the day period, and the cost of the chemical 1 Month + .8( 7762.50 pph) = 7762.50 pph + 0500 m
for a 30 days period?
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 once per shift
should you check the water level?
How often do you check the high limit Annually
switch?
What is the recommended time for a once per shift
complete external inspection of a boiler?
What is the first thing to do when shutting To turn off the fire
down a boiler?
A flow control should be blown down once per shift
when?
How often should you check the Low Water once per shift
Fuel Cut off?
Why is oil added to the refrigerant? lubrication of the compressor
Keep refrigerant migrating
Recycled and filtered refrigerant can be By the same owner in the same type of equipment
used where?
Data printed on the equipment Stamp of approval from commissioning authority
nameplate would include manufacturer,
model, and
serial number and_________?
