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.Management Sciences
Category: Fuels and Combustion
Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?
A. Problem of uniform heating along its height
B. Structural strength of silica bricks
C. Problem in door cleaning
D. Buckling of ram of pusher car at the time of coke pushing
Which of the following gaseous fuels has the highest net calorific value (kcal/Nm3) ?
A. Producer gas
B. Carburetted water gas
C. Natural gas
D. Liquefied petroleum gas
Fuel combustion is never cent per cent efficient due to___________________?
A. Incomplete combustion
B. Dry gas/stack gas loss
C. Moisture loss
D. All A., B. and C.
Low temperature oxidation of coal resulting from bad storage conditions does not decrease its______________________?
A. Caking power
B. Calorific value
C. Hydrogen content
D. Oxygen content
Fuel consumption in coke making can be reduced by___________________?
A. Preheating, blending and de-ashing the coal
B. Stamped charging of coal
C. Dry quenching of coke
D. All A., B. and C.
Which of the following combustibles is absent in blast furnace gas ?
A. H2
B. CH4
C. CO
D. None of these
Advantages of fluidised bed combustion are ____________________?
A. Reduced NOx formation in flue gas
B. Lower furnace operating temperature
C. High heat transfer rate
D. All A., B. & C.
Efficiency of the combustion of a fuel is judged by the ______________ the flue gas?
A. % of CO2 in
B. % of O2in
C. Temperature of
D. Colour of
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