Coke having higher porosity has ___________________?
A. Lower bulk density
B. Lower strength
C. Higher reactivity
D. All A., B. and C.
Fuels and Combustion
Coals used for the generation of producer gas should have ____________________?
Coals used for the generation of producer gas should have ____________________?
A. High caking index
B. Low fusion point of ash
C. High volatile matter content
D. Very low ash content (8-10%)
Caking coal is desirable for_________________?
Caking coal is desirable for_________________?
A. Burning on travelling grate
B. Coke making
C. Burning on firebars
D. All A., B. and C.
A coal having higher volatile matter content, has lower_________________?
A coal having higher volatile matter content, has lower_________________?
A. Smoking tendency on burning
B. Coke oven gas yield on carbonisation
C. Chance of catching fire during storage in open space
D. Ignition temperature
Which of the following is unsuitable fuel for producer gas manufacture ?
Which of the following is unsuitable fuel for producer gas manufacture ?
A. Coke
B. Anthracite
C. Coal having low fusion point of its ash
D. Coal having high fusion point of its ash
Use of preheated air for combustion of fuel in the furnace, increases the___________________?
Use of preheated air for combustion of fuel in the furnace, increases the___________________?
A. Scale losses of the furnace stock
B. Calorific value of the fuel
C. Flame temperature
D. None of these
Which of the following is a poisonous fuel gas ?
Which of the following is a poisonous fuel gas ?
A. Coke oven gas
B. Blast furnace gas
C. Natural gas
D. None of these
Blast furnace gas compared to coke oven gas has_________________?
Blast furnace gas compared to coke oven gas has_________________?
A. Lower ignition temperature
B. Narrower limit of inflammability
C. Higher calorific value
D. Lower theoretical flame temperature
Which of the following has the highest calorific value (kcal/Nm3) ?
Which of the following has the highest calorific value (kcal/Nm3) ?
A. Carburetted water gas
B. Gobar gas
C. Natural gas
D. LPG
The main function of primary air in pulverised coal fired burner is to_________________?
The main function of primary air in pulverised coal fired burner is to_________________?
A. Burn CO to CO2
B. Dry and transport the coal
C. Have proper combustion by supplying it around the burner
D. Preheat the tertiary air used for complete combustion of CO to CO2