Yield of charcoal in high temperature carbonisation of wood is about _____________ percent?
A. 10
B. 25
C. 50
D. 75
Fuels and Combustion
Fixed carbon in coal is defined as______________________?
Fixed carbon in coal is defined as______________________?
A. That present in volatile matters
B. The total quantity of carbon present in the coal
C. Hundred minus the percentage of volatile matter, ash and moisture
D. The one which is present in the residue after combustion
During combustion of gaseous fuels, deficiency of air_________________?
During combustion of gaseous fuels, deficiency of air_________________?
A. Lengthens the flame
B. Tends to shorten the flame
C. Does not affect the flame length
D. Increases the flame temperature
Calorific value of furnace oil is about _______________ Kcal/kg?
Calorific value of furnace oil is about _______________ Kcal/kg?
A. 10,000
B. 15,000
C. 5,000
D. 20,000
Air/gas ratio for complete combustion will be the highest for__________________?
Air/gas ratio for complete combustion will be the highest for__________________?
A. LPG
B. Gobar gas
C. Coke oven gas
D. Carburetted water gas
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
Which of the following is not a by-product recovered in a high temperature coal carbonisation plant ?
A. Benzol
B. Pitch-creosote mixture (PCM)
C. Naphthalene
D. Ethylene
The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?
The ratio of maximum adiabatic flame temperature in air to that in pure oxygen is always___________________?
A. 1
B. < 1
C. > 1
D. Unpredictable
A good coking coal should have high ______________ content?
A good coking coal should have high ______________ content?
A. Ash
B. Sulphur & phosphorus
C. Moisture
D. None of these
Gross & net calorific value is the same for___________________?
Gross & net calorific value is the same for___________________?
A. Blast furnace gas
B. Coke oven gas
C. L.D. converter gas
D. None of these
Removal of hydrogen from coke oven gas ___________________?
Removal of hydrogen from coke oven gas ___________________?
A. Increases its calorific value
B. Decreases its calorific value
C. Does not alter its calorific value
D. Is not possible on commercial scale