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Fuels and Combustion

Fuels and Combustion
Shatter index of metallurgical coke on 2 inches and 0.5 inch screen should be respectively around __________ percent.

95 and 100
40 and 70
25 and 97
80 and 97

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Fuels and Combustion
Coal is heated in absence of air for 7 minutes at a temperature of about __________ °C, during its volatile matter determination for proximate analysis.

550
750
950
1150

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Fuels and Combustion
Coal is pulverised before burning in large capacity boiler furnaces mainly to

Provide trouble free operation
Facilitate easy ash removal
Enhance its calorific value
Ensure its complete combustion

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Fuels and Combustion
Washing of coal does not reduce its

None of these
S & P content
Heating value
Fusion point of ash

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Fuels and Combustion
Stoichiometric combustion of 12 kg of carbon requires __________ of oxygen.

All of these
32 kg
22.4 Nm³
1kg mole

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Fuels and Combustion
During combustion of coal on grate, clinker formation is increased by the

Use of preheated primary air
Use of thick fire bed
Low fusion point of ash (< 1100° C)
All of these

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