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Furnace Technology

Furnace Technology
Regenerators compared to the recuperators for the same duty

Occupy more space
Are of smaller size
Are less costly
All of these

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Furnace Technology
Which of the following accentuates clinker-ing troubles on furnace grate burning coal?

Low forced draft & fuel bed temperature
Thick firebed and preheated primary air
All of these
Low reactivity of carbonised residue containing high proportion of iron & sulphur

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Furnace Technology
Combustion of furnace oil in a furnace (soaking pit) with preheated combustion air at 400°C results in saving of about __________ percent furnace oil as compared to its combustion with atmospheric air, if the flue gas outlet temperature from the soaking pit is 1200°C.

20
60
5
40

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Furnace Technology
The main function of a muffle in the muffle furnace is to

Neither A nor B
Both A & B
Smooth out temperature inequalities on the combustion side of the muffle wall
Protect the charge from the effects of the products of combustion

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Furnace Technology
The function of an economiser in a boiler is to preheat the

Feedwater
Furnace oil
Pulverised coal
Combustion air

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Furnace Technology
Means for giving direction to the circulation of gases in furnaces are

Location of outlet ports and heating & combustion devices
All of these
Fans
Arrangement of heating stock in the furnaces

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