5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
Power Engineering 2A3 Exam Questions &
Answers | Latest Already Graded A+ |Questions
with Correct Answers 2026 latest update!!
Save Groups
Terms in this set (269)
One boiler horsepower is equal to 9.809kW
how many kW
This is still the common measure of capacity for
small boilers, where large boiler capacity is given
in the number of kg of steam per hour.
What are the definitions of boiler, Boiler - strictly speaking are the elements in which
steam generator and steam the change of state from water to steam takes
generating unit? place.
Steam generator - embraces the many
combinations of heating surfaces, such as water
walls, superheaters, reheaters, economizers, and air
heaters.
Steam generating units - consists of a steam
generator and its associated equipment, including
fuel burning, ash removal, and draft systems.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 1/71
,5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the three general methods 1) One square meter of heating surface equals 10
of calculating the output rating of a kW. Where a computation is to be made of a
boiler? curved surface, the surface having the greater
radius shall be taken.
2)Where electric power is used as the heat source,
the boiler rating shall be the maximum kilowatt
rating of the heating element. The actual output will
be somewhat less.
3) Where neither of the above determinations are
applicable, an hourly output of 36 MJ is equivalent
to 10 kW. This is the calculation employed in
determining the heat balance of a steam plant.
Steam generators are often rated in maximum continuous steam output in kg/hr at
terms of design temperature and pressure. The kg/hr rating
at the stop valves must include reheater sections of
steam generating units.
Steam generators supplying steam megawatts, because the energy supplied to the
to turbo-alternators are often rated turbines is converted to electrical power. This is not
in an accurate measure of the energy output because
the turbine and generator efficiencies are not
considered.
What are the standard conditions for The amount of heat necessary to convert 1 kg of
comparing boilers/equivalent water at 100 ℃ into 1 kg of 100% dry steam at
evaporation? 101.325 kPa and 100 ℃
What is the factor of evaporation? The ratio between the heat taken per kg of steam
under actual conditions and the heat taken in
evaporating 1 kg of dry steam at 100 ℃
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 2/71
,5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the 5 fundamental - Efficiency
requirements, or objectives, for - Reliability
boiler design? - Cost
- Serviceability
- Safety
When looking at boiler design, which - The furnace size or heating surface
components will be influenced due - The placement of the heating surface
to the type of fuel being used? - The equipment needed to prepare and burn the
fuel
- The size and type of heat recovery equipment
- The fuel gas treatment devices
What is the most common type of Pulverized coal
solid fuel that is burned?
For the same output, which furnace The coal furnaces must be larger, but the velocities
must be the largest for gas, oil or of the combustion gases must be slower. The
coal? combustion process is slower, because the solid
coal releases volatile matter which is then oxidized.
What are the differences in furnace High-slagging lignite coal will require a larger
size needed for the different types of furnace volume than volatile bituminous or
coal? subbituminous coal.
Medium-sized furnaces are specified for low-
slagging types of lignite coal.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 3/71
, 5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the design parameters - The time needed to completely combust the fuel
used for oil-fired furnaces? - The need to limit furnace wall temperatures
Oil fired furnaces have higher heat release rates
per unit volume (compared to coal), as no extra
size is built in for ash control. The result is heat
absorption rates can been seen on metal
temperatures and circulation.
Gas fired furnace designs They are similar to the design of oil firing, except
that gas firing results in lower localized heat
absorption rates, which means the furnace
temperature is more uniform than with oil.
Therefore, the furnace can be slightly smaller in
volume than an oil-fired furnace.
Define circulation ratio The amount of water circulated in a boiler usually
exceeds the amount of steam being generated. If
10 kg of steam-water mixture is circulated for each
kg of steam generated, the circulation ratio is 10:1.
What is top dryness? The percentage of steam, by mass, in the steam
water mixture at the top of a riser tube, where
heating ceases is called top dryness.
It varies with design but normally runs from about
5% to 20%.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 4/71
Power Engineering 2A3 Exam Questions &
Answers | Latest Already Graded A+ |Questions
with Correct Answers 2026 latest update!!
Save Groups
Terms in this set (269)
One boiler horsepower is equal to 9.809kW
how many kW
This is still the common measure of capacity for
small boilers, where large boiler capacity is given
in the number of kg of steam per hour.
What are the definitions of boiler, Boiler - strictly speaking are the elements in which
steam generator and steam the change of state from water to steam takes
generating unit? place.
Steam generator - embraces the many
combinations of heating surfaces, such as water
walls, superheaters, reheaters, economizers, and air
heaters.
Steam generating units - consists of a steam
generator and its associated equipment, including
fuel burning, ash removal, and draft systems.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 1/71
,5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the three general methods 1) One square meter of heating surface equals 10
of calculating the output rating of a kW. Where a computation is to be made of a
boiler? curved surface, the surface having the greater
radius shall be taken.
2)Where electric power is used as the heat source,
the boiler rating shall be the maximum kilowatt
rating of the heating element. The actual output will
be somewhat less.
3) Where neither of the above determinations are
applicable, an hourly output of 36 MJ is equivalent
to 10 kW. This is the calculation employed in
determining the heat balance of a steam plant.
Steam generators are often rated in maximum continuous steam output in kg/hr at
terms of design temperature and pressure. The kg/hr rating
at the stop valves must include reheater sections of
steam generating units.
Steam generators supplying steam megawatts, because the energy supplied to the
to turbo-alternators are often rated turbines is converted to electrical power. This is not
in an accurate measure of the energy output because
the turbine and generator efficiencies are not
considered.
What are the standard conditions for The amount of heat necessary to convert 1 kg of
comparing boilers/equivalent water at 100 ℃ into 1 kg of 100% dry steam at
evaporation? 101.325 kPa and 100 ℃
What is the factor of evaporation? The ratio between the heat taken per kg of steam
under actual conditions and the heat taken in
evaporating 1 kg of dry steam at 100 ℃
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 2/71
,5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the 5 fundamental - Efficiency
requirements, or objectives, for - Reliability
boiler design? - Cost
- Serviceability
- Safety
When looking at boiler design, which - The furnace size or heating surface
components will be influenced due - The placement of the heating surface
to the type of fuel being used? - The equipment needed to prepare and burn the
fuel
- The size and type of heat recovery equipment
- The fuel gas treatment devices
What is the most common type of Pulverized coal
solid fuel that is burned?
For the same output, which furnace The coal furnaces must be larger, but the velocities
must be the largest for gas, oil or of the combustion gases must be slower. The
coal? combustion process is slower, because the solid
coal releases volatile matter which is then oxidized.
What are the differences in furnace High-slagging lignite coal will require a larger
size needed for the different types of furnace volume than volatile bituminous or
coal? subbituminous coal.
Medium-sized furnaces are specified for low-
slagging types of lignite coal.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 3/71
, 5/19/26, 9:34 AM Power Engineering 2A3 Exam Questions & Answers | Latest Already Graded A+ |Questions with Correct Answers 2026 latest updat…
What are the design parameters - The time needed to completely combust the fuel
used for oil-fired furnaces? - The need to limit furnace wall temperatures
Oil fired furnaces have higher heat release rates
per unit volume (compared to coal), as no extra
size is built in for ash control. The result is heat
absorption rates can been seen on metal
temperatures and circulation.
Gas fired furnace designs They are similar to the design of oil firing, except
that gas firing results in lower localized heat
absorption rates, which means the furnace
temperature is more uniform than with oil.
Therefore, the furnace can be slightly smaller in
volume than an oil-fired furnace.
Define circulation ratio The amount of water circulated in a boiler usually
exceeds the amount of steam being generated. If
10 kg of steam-water mixture is circulated for each
kg of steam generated, the circulation ratio is 10:1.
What is top dryness? The percentage of steam, by mass, in the steam
water mixture at the top of a riser tube, where
heating ceases is called top dryness.
It varies with design but normally runs from about
5% to 20%.
https://quizlet.com/1181946896/power-engineering-2a3-exam-questions-answers-latest-already-graded-a-questions-with-correct-answers-2026-latest… 4/71
