ABSA 3B1 Exam (Latest 2025/2026 Update) Questions with Verified
3B1 ABSA Questions
Answers | 100% Correct.
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1. Combustion air for the burners is preheated to ______ 350°C
in the air heater section by combustion gases leaving
the economizer section.
2. Most downcomers run horizontally between the False
steam drum and the mud drum.
3. Steam bubbles form in the hottest tubes and rise to True
the steam drum where the steam is separated out
of the water and steam mixture. Circulation is main-
tained by water returning to the mud drum through
the cooler tubes. The hotter tubes (the risers) are the
ones in the radiant area of the furnace and the hottest
areas of the generating bank of tubes.
4. What is the main advantage of the packaged boiler? Low cost
5. Generally, two types of draft fans are used. A(n) _____ Forced draft, induced
____ fan supplies air to the air preheater. The preheat- draft
ed air for combustion goes to the coal pulverizers
and to the burners. A(n) ______ ____ fan exhausts the
combustion gases from the air heater to the stack.
6. One square metre of heating surface equals 10 kilo- True
watts. The heating surface of a boiler must be deter-
mined by computing the area of the surface involved
in square metres. Where a computation is to be made
of a curved surface, the surface with the greater ra-
dius is taken.
7. When the boiler provides the entire steam supply to True
an electric generating unit, the output of the boiler is
, 3B1 ABSA Questions
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expressed in terms of power output of the generator
(e.g. a 300 megawatt boiler).
8. What is the range for packaged watertube boiler ca- 2300 kg to 65 000 kg per
pacities? hour
9. What is the output of field-erected boilers? 150 000 kg/h or more
10. The A-, D-, and O- type boilers have furnaces cooled by Watertubes
_________ lining the furnace walls.
11. Where electric power is used as the heating source, Heating element
the boiler rating is the maximum kilowatt rating of
which aspect?
12. The difference in density between water and saturat- 22 090 kPa
ed steam becomes progressively less with increased
pressure and disappears altogether at the critical
pressure of _______ .
13. The main feature of a controlled circulation boiler is True
a (circulating) pump, which is used to provide circula-
tion.
14. The advantage of forced circulation in a boiler is a Positive
_________ flow in all tubes.
15. The steam separating equipment separates the Steam
_______ from the steam/water mixture.
16. Not all once-through boilers use forced circulation. False
17. One passage
, 3B1 ABSA Questions
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The arrangement of a once-through boiler has no
drums. How many passes through the unit does it take
to heat, evaporate, and superheat the feedwater?
18. Steam generators operating above critical pressure Super, sub
are said to be ______-critical, and steam generators op-
erating below critical pressure are classed as ____-crit-
ical.
19. A steam generating unit consists of a number of el- Water conditioner
ements, all of which contribute to the production of
steam. Which of the following is not an element of a
typical steam generator?
20. Natural circulation in a boiler depends on the Difference
___________ in the density of a column of water and
the density of a column that contains a steam/water
mixture.
21. Feedwater entering the boiler section first passes Economizer
through the __________ section where it is heated by
the combustion gases leaving the boiler.
22. The disadvantages of forced circulation in a boiler are Increased costs
the __________ of equipment such as pumps and piping
23. There are several factors that influence the natural cir- The diameter of the steam
culation in a watertube boiler. Which of the following drum.
is NOT one of those factors?
24. The downcomers are located in the ______ regions of Cooler, hottest
the boiler, or external to the furnace altogether. The
risers are located in the ________ zones of the boiler,
, 3B1 ABSA Questions
Study online at https://quizlet.com/_f6brin
and are exposed to radiant heat of the furnace or to
the very hot flue gases near the furnace.
25. The control methods used for reheater temperature Superheater
are the same as those used for __________ temperature
control.
26. Reheaters are located in the furnace in areas of rela- High
tively _____ gas temperatures.
27. When the boiler is shut down, the air preheater should Corrosion
be inspected for signs of _______.
28. When starting up a boiler, a steam flow is needed Superheater
through the __________ tubes for cooling
29. The boiler tubes of the ______ wall are placed side by Tangent tube
side and touching each other to form a continuous
water-cooled envelope around the furnace.
30. The water and water/steam mixture in the steam gen- Saturation
eration tubes is at _________ temperature.
31. The temperatures of the flue gas leaving the pre- Dewpoint
heater must be kept above the _______ to avoid con-
densation.
32. The _________ increases the temperature of the steam Reheater
from the HP turbine back up to superheat tempera-
ture.
33. In order to direct the flow of combustion gas over Baffles
the tubes in a watertube boiler, it is necessary to use
_______.
3B1 ABSA Questions
Answers | 100% Correct.
Study online at https://quizlet.com/_f6brin
1. Combustion air for the burners is preheated to ______ 350°C
in the air heater section by combustion gases leaving
the economizer section.
2. Most downcomers run horizontally between the False
steam drum and the mud drum.
3. Steam bubbles form in the hottest tubes and rise to True
the steam drum where the steam is separated out
of the water and steam mixture. Circulation is main-
tained by water returning to the mud drum through
the cooler tubes. The hotter tubes (the risers) are the
ones in the radiant area of the furnace and the hottest
areas of the generating bank of tubes.
4. What is the main advantage of the packaged boiler? Low cost
5. Generally, two types of draft fans are used. A(n) _____ Forced draft, induced
____ fan supplies air to the air preheater. The preheat- draft
ed air for combustion goes to the coal pulverizers
and to the burners. A(n) ______ ____ fan exhausts the
combustion gases from the air heater to the stack.
6. One square metre of heating surface equals 10 kilo- True
watts. The heating surface of a boiler must be deter-
mined by computing the area of the surface involved
in square metres. Where a computation is to be made
of a curved surface, the surface with the greater ra-
dius is taken.
7. When the boiler provides the entire steam supply to True
an electric generating unit, the output of the boiler is
, 3B1 ABSA Questions
Study online at https://quizlet.com/_f6brin
expressed in terms of power output of the generator
(e.g. a 300 megawatt boiler).
8. What is the range for packaged watertube boiler ca- 2300 kg to 65 000 kg per
pacities? hour
9. What is the output of field-erected boilers? 150 000 kg/h or more
10. The A-, D-, and O- type boilers have furnaces cooled by Watertubes
_________ lining the furnace walls.
11. Where electric power is used as the heating source, Heating element
the boiler rating is the maximum kilowatt rating of
which aspect?
12. The difference in density between water and saturat- 22 090 kPa
ed steam becomes progressively less with increased
pressure and disappears altogether at the critical
pressure of _______ .
13. The main feature of a controlled circulation boiler is True
a (circulating) pump, which is used to provide circula-
tion.
14. The advantage of forced circulation in a boiler is a Positive
_________ flow in all tubes.
15. The steam separating equipment separates the Steam
_______ from the steam/water mixture.
16. Not all once-through boilers use forced circulation. False
17. One passage
, 3B1 ABSA Questions
Study online at https://quizlet.com/_f6brin
The arrangement of a once-through boiler has no
drums. How many passes through the unit does it take
to heat, evaporate, and superheat the feedwater?
18. Steam generators operating above critical pressure Super, sub
are said to be ______-critical, and steam generators op-
erating below critical pressure are classed as ____-crit-
ical.
19. A steam generating unit consists of a number of el- Water conditioner
ements, all of which contribute to the production of
steam. Which of the following is not an element of a
typical steam generator?
20. Natural circulation in a boiler depends on the Difference
___________ in the density of a column of water and
the density of a column that contains a steam/water
mixture.
21. Feedwater entering the boiler section first passes Economizer
through the __________ section where it is heated by
the combustion gases leaving the boiler.
22. The disadvantages of forced circulation in a boiler are Increased costs
the __________ of equipment such as pumps and piping
23. There are several factors that influence the natural cir- The diameter of the steam
culation in a watertube boiler. Which of the following drum.
is NOT one of those factors?
24. The downcomers are located in the ______ regions of Cooler, hottest
the boiler, or external to the furnace altogether. The
risers are located in the ________ zones of the boiler,
, 3B1 ABSA Questions
Study online at https://quizlet.com/_f6brin
and are exposed to radiant heat of the furnace or to
the very hot flue gases near the furnace.
25. The control methods used for reheater temperature Superheater
are the same as those used for __________ temperature
control.
26. Reheaters are located in the furnace in areas of rela- High
tively _____ gas temperatures.
27. When the boiler is shut down, the air preheater should Corrosion
be inspected for signs of _______.
28. When starting up a boiler, a steam flow is needed Superheater
through the __________ tubes for cooling
29. The boiler tubes of the ______ wall are placed side by Tangent tube
side and touching each other to form a continuous
water-cooled envelope around the furnace.
30. The water and water/steam mixture in the steam gen- Saturation
eration tubes is at _________ temperature.
31. The temperatures of the flue gas leaving the pre- Dewpoint
heater must be kept above the _______ to avoid con-
densation.
32. The _________ increases the temperature of the steam Reheater
from the HP turbine back up to superheat tempera-
ture.
33. In order to direct the flow of combustion gas over Baffles
the tubes in a watertube boiler, it is necessary to use
_______.
