Fuels and Combustion

A. Neumann reversal
B. Shift conversion
C. Boudouard
D. Reduction

A. Is not undesirable
B. Reduces its calorific value
C. Badly affects the quality of steel
D. Increases its caking power

A. Blast furnace gas
B. Coke oven gas
C. Water gas
D. Carburetted water gas

A. 1300
B. 500
C. 4500
D. 9000

A. High amount/current of combustion air
B. Low amount/current of combustion air
C. Preheated secondary air
D. Very little excess air

A. Use of thick fire bed
B. Low fusion point of ash (< 1100° C)
C. Use of preheated primary air
D. All A., B. & C.

A. 4000
B. 2500
C. 6500
D. 10000

A. Caking tendency
B. Coking tendency
C. Clinkering tendency
D. Size stability

A. CO2 : 6.26, CO : 1.56, O2 : 3.91, H2O :15.66, N2 : 72.60
B. CO2 : 7.42, CO : 1.86, O2 : 4.64, N2:86.02
C. CO2 : 6.39, CO : 1.60, O2 : 3.99, H2O:25.96, N2:72.06
D. CO2 : 7.60, CO : 1.90, O2 : 4.75, N2 : 85.74

A. Preheating of fuel gases & combustion air
B. Reducing sulphur content in the fuel
C. Adopting proper fuel firing technique & fuel preparation
D. Supplying correct amount of combustion air