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Fuels and Combustion

Fuels and Combustion
A coal containing very high percentage of durain is called __________ coal.

Boghead
Splint
Non-banded
Bright

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Fuels and Combustion
As the equilibrium moisture content of the coal increases, its

Calorific value increases
Swelling number decreases
Bulk density decreases
Swelling number increases

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Fuels and Combustion
The hottest part of the flame lies in its____zone.

Yellow
Luminous
Unburnt gases
Non-luminous

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Fuels and Combustion
Quantity of coke oven gas produced by high temperature carbonisation of one ton of dry coal may be around __________ Nm³.

30
300
30, 000
3000

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Fuels and Combustion
In flue gas analysis by Orsat's apparatus, carbon monoxide is absorbed by

Alkaline pyrogallol solution
Cuprous chloride
Potassium hydroxide
None of these

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Fuels and Combustion
Which of the following fuels is the best for burning on chain grate stoker?

Coking coal
Pulverised coal
Non-caking coal
Caking coal

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