A. 11.5
B. 0.5
C. 23
D. 12
Related Mcqs:
- Oxygen required for theoretically complete combustion of 1 Nm3 methane is ______________ Nm3?
A. 2
B. 4
C. 6
D. 1 - Stoichiometric combustion of 12 kg of carbon requires _____________ of oxygen?
A. 1kg mole
B. 22.4 Nm3
C. 32 kg
D. All A., B. and C. - Use of excess of combustion air in the combustion of fuels results in__________________?
A. Heat losses
B. Long flame
C. Condensation of water vapour from the fuel gas
D. None of these - Deficiency of combustion air during combustion of a gaseous fuel_____________________?
A. Lengthens the flame
B. Causes heat loss of fuel by its partial combustion
C. Both A. & B.
D. Shortens the flame - Furnace oil consumption in a furnace for a given duty employing preheated combination air (at 300°) may be reduced by about ______________ percent as compared to the use of atmospheric combustion air?
A. 5
B. 10
C. 20
D. 35 - Supply of excess air for complete combustion of fuel is necessitated to facilitate___________________?
A. Its thorough mixing with air
B. Attainment of chemical equilibrium
C. Attainment of high temperature
D. None of these - Air/gas ratio for complete combustion will be the highest for__________________?
A. LPG
B. Gobar gas
C. Coke oven gas
D. Carburetted water gas - About _____________ Nm3 of air will be required for the complete combustion of 2Nm3 of CO?
A. 2
B. 3
C. 4
D. 5 - Which of the following would require maximum amount of % excess air for complete combustion ?
A. Coke oven gas
B. Furnace oil
C. Pulverised coal
D. Lump coal (fixed on chain grate) - Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?
A. Calorific value of the fuel
B. Flame temperature achieved
C. Speed of combustion of fuel
D. Heat transfer rate to the stock in the furnace
