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Fuels and Combustion

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

Unburnt gases
Luminous
Non-luminous
Yellow

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Fuels and Combustion
Coke oven gas produced by high temperature carbonisation of coal (as compared to that produced by low temperature carbonisation), has

Higher calorific value
Neither A nor B
Both A & B
Lower hydrogen content

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Fuels and Combustion
Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

% of O₂in
Temperature of
%of CO₂ in
Colour of

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Fuels and Combustion
Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt 'using theoretical amount of air in

Oxygen
Either A or B
Air
Either A or C without gain or loss of heat

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Fuels and Combustion
The calorific value of producer gas is around __________ kcal/Nm³

500
4500
9000
1300

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Fuels and Combustion
Ash content in the coke produced from a coking coal having 20% ash may be around __________ percent.

12
24
6
18

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