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Furnace Technology

Furnace Technology
Maximum thermal efficiency of boiler may be about __________ percent.

90
25
10
65

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Furnace Technology
In case of pulverised coal fired steam boiler, the secondary air serves the main purpose of

Preheating the primary air
Drying of coal
Combustion of coal by supplying it around the burner
Transportation of coal

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Furnace Technology
Temperature of a furnace fired with low calorific value fuel gas (i.e. lean gas) can be increased by

Preheating the fuel gas
All of these
Oxygen enrichment of combustion air
Preheating the combustion air

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Furnace Technology
Dampers are located

After the I.D. fan
Near the top of the chimney
Anywhere after the I.D. fan
Before the I.D fan

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Furnace Technology
A refractory wall separating the stock and the source of heat is provided in a

Continuous furnace
None of these
Muffle furnace
Updraft kiln

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Furnace Technology
In producer gas making furnace, steam is added along with air to mainly control the

Fusion of coal ash & clinker formation
V. of producer gas
Tar content in producer gas
Temperature of producer gas

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