Fuels and Combustion
Softening temperature of coal ash is a measure of the __________ of coal.

Caking tendency
Size stability
Coking tendency
Clinkering tendency

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Fuels and Combustion
Combustion of pulverised fuel

All of these
Requires larger combustion chamber than rich gaseous fuel
In a metallurgical furnace does not contaminate the product in the furnace by ash from fuel
Suppresses the discharge of fine dust and grit into atmosphere

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Fuels and Combustion
Prime coking coal is always blended with medium or non- coking coal before ear-bonisation

Because, it alone produces unreactive coke
Both A & B
To check against its excessive swelling during heating, which may exert high pressure and damage coke oven walls
Neither A nor B

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