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Unit 13 – Combustion Questions And Answers With Verified Solutions 100% Correct!!!
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Unit 13 – Combustion Questions And Answers With Verified Solutions 100% Correct!!!
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Unit 13 – Combustion Questions AndAnswers With Verified Solutions 100%
Correct!!!
Black smoke, defined as "unburned carbon", can be caused by: - ANSWER✔✔A)
insufficient combustion air
The approximate amount of excess air for fuel oil is: - ANSWER✔✔B) 15%
The reason FBC plants can be built smaller than plants currently popular because
of: - ANSWER✔✔B) Higher heat transfer rates and the absence of wet exhaust
scrubbing equipment
Low fuel pressure in oil burners produces: - ANSWER✔✔E) unstable conditions
of burning
Inlet damper control on a fan: - ANSWER✔✔E) requires less power to drive the
fan at reduced loads.
Primary air: - ANSWER✔✔D) is premixed with the fuel before being admitted to
the furnace.
If, during a flue gas analysis, the excess air to a boiler furnace is increased: -
ANSWER✔✔D) CO2 percentage should decrease.
In AFBC, the fuel content by mass of the turbulent material is usually less than: -
ANSWER✔✔C) 2%
, To which of the following oil burners is the oil supplied under high pressure? -
ANSWER✔✔A) mechanical atomizing burner.
Poor combustion due to improper amount of air will cause: - ANSWER✔✔C) a
collection of partly burned fuel which could cause a furnace explosion.
A design disadvantage of the application of a PFBC furnace is: - ANSWER✔✔A)
Erosion and/or corrosion/fouling of turbine blades may occur.
Chemicals are injected into the boiler to: - ANSWER✔✔A) prevent corrosion.
B) keep sludge dispersed.
C) prevent sludge.
D) prevent scale.
The efficiency of a combined cycle plant based on pressurized fluidized bed
combustion (PFBC) is about _____ higher than a conventional pulverized coal
plant - ANSWER✔✔E) 5%
What is the percentage of SO2 reduction which can be gained by adding an excess
amount of limestone to the bed of an AFBC unit? - ANSWER✔✔D) 80 - 90
percent
The amount of excess air required for combustion is determined by the: -
ANSWER✔✔E) composition and condition of the fuel
The refining process for fuel oils involves separating the crude oil into end
products which have distinguishing characteristics such as specific gravity,
viscosity, and: - ANSWER✔✔D) boiling point
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