DC 3rd Class Test
1. The component in which
evaporator
liquid vapor by
absorbing heat is called?
2. the best answer for an
Metal stake drive 8 foot into the
elec- trical grounding
method?
3. A valve should be ground. Globe
used for throttling
purpos- es?
4. What is the acceptable 30-70
range for residual
sodium sulfite in the
boiler main- tain?
5. What is the BTU content 146,000
of a gallon of #4 fuel oil?
6. What does a zeolite water brine
softener system use as a
means of regeneration?
7. What are the 4 steps for a Backwash, Brine, Rinse, Service
Zeolite Rejuvenation water
softener process?
8. Where medium tempera- Condenser
ture liquid found?
9. Where is high temperature At the discharge of the compressor or
vapor found? con- denser
10. What stays are used to sup- Diagonal Stays
port the burner chamber in
a scotch marine boiler?
11. What type of safety valve is ( Full) Crosby nozzle-type safety valve.
Page
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49
, DC 3rd Class Test
this? 365 BOG
2/
49
, DC 3rd Class Test
12. Where do you get $8.75 per gal- lon, and will treat 600
super- heat reading? gal- lon. Find the amount of the
chemical needed for the
13. Name the wire that con-
nects all component of
a system to a physical
ground or water pipe?
14. Where do you get sub-
cool- ing reading?
15. On the boilers that have
both Quick opening and
Screw type blow down
valves, the Quick
opening valve must be
located?
16. High pressure boilers
equipped with Quick
open- ing and Screw type
valves are blown down
how?
17. ASME Code defines a
slow opening valve as
what?
18. A 300 Horsepower boiler
operating at 100psi has an
average load of 75% with
80% condensate return
and 5% blow down. The
treat- ment provides a
chemical which costs
3/
49
, DC 3rd Class Test
Take suction line = Evaporator + Blow Down
Average Evaporator Rate = 300 x 34.5
pressure Grounding pph x
.75% load = 7762, 50 pph
electrode conductor 1 Month + .8( 7762.50 pph) = 7762.50
pph +
0500 m
Take liquid line pressure
Cross reference to
temperature using a P/T
Chart
Get liquid line temperature
Subtract actual temperature
from cross refer- enced
temperature
Result is Sub cooling
closest to the boiler
and followed by the
screw-type valve
By opening the Quick
opening valve first and
closing it Last.
One requiring at least 5 full
360 degree turns between
full open and close position.
Water In = Water Out
Makeup + Condensate Return
4/
49
1. The component in which
evaporator
liquid vapor by
absorbing heat is called?
2. the best answer for an
Metal stake drive 8 foot into the
elec- trical grounding
method?
3. A valve should be ground. Globe
used for throttling
purpos- es?
4. What is the acceptable 30-70
range for residual
sodium sulfite in the
boiler main- tain?
5. What is the BTU content 146,000
of a gallon of #4 fuel oil?
6. What does a zeolite water brine
softener system use as a
means of regeneration?
7. What are the 4 steps for a Backwash, Brine, Rinse, Service
Zeolite Rejuvenation water
softener process?
8. Where medium tempera- Condenser
ture liquid found?
9. Where is high temperature At the discharge of the compressor or
vapor found? con- denser
10. What stays are used to sup- Diagonal Stays
port the burner chamber in
a scotch marine boiler?
11. What type of safety valve is ( Full) Crosby nozzle-type safety valve.
Page
1/
49
, DC 3rd Class Test
this? 365 BOG
2/
49
, DC 3rd Class Test
12. Where do you get $8.75 per gal- lon, and will treat 600
super- heat reading? gal- lon. Find the amount of the
chemical needed for the
13. Name the wire that con-
nects all component of
a system to a physical
ground or water pipe?
14. Where do you get sub-
cool- ing reading?
15. On the boilers that have
both Quick opening and
Screw type blow down
valves, the Quick
opening valve must be
located?
16. High pressure boilers
equipped with Quick
open- ing and Screw type
valves are blown down
how?
17. ASME Code defines a
slow opening valve as
what?
18. A 300 Horsepower boiler
operating at 100psi has an
average load of 75% with
80% condensate return
and 5% blow down. The
treat- ment provides a
chemical which costs
3/
49
, DC 3rd Class Test
Take suction line = Evaporator + Blow Down
Average Evaporator Rate = 300 x 34.5
pressure Grounding pph x
.75% load = 7762, 50 pph
electrode conductor 1 Month + .8( 7762.50 pph) = 7762.50
pph +
0500 m
Take liquid line pressure
Cross reference to
temperature using a P/T
Chart
Get liquid line temperature
Subtract actual temperature
from cross refer- enced
temperature
Result is Sub cooling
closest to the boiler
and followed by the
screw-type valve
By opening the Quick
opening valve first and
closing it Last.
One requiring at least 5 full
360 degree turns between
full open and close position.
Water In = Water Out
Makeup + Condensate Return
4/
49
