A. 0.21
B. 3.76
C. 4.76
D. 0.79
Related Mcqs:
- 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 - Tolerable concentration of toxic carbon monoxide in atmospheric air is about ______________ ppm?
A. 50
B. 1000
C. 5000
D. 10000 - Dry air required to burn 1 kg of carbon completely may be around ______________ kg?
A. 11
B. 2
C. 20
D. 38 - Ratio of primary air to secondary air increases with increase in the rank of coal, because the__________________?
A. High rank coals have higher amount of volatile matter
B. Ratio of fixed carbon to volatile matter increases
C. Oxygen content progressively decreases
D. Calorific value of the coal increases - For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will_____________________?
A. Increase
B. Decrease
C. Increase or decrease depending on the fuel type
D. Not change - Oxygen percentage (by weight) in atmospheric air is_________________?
A. 19
B. 21
C. 23
D. 29 - Dry air requirement for burning 1 Nm3 of CO to CO2 may be around _______________ Nm3 ?
A. 2.4
B. 1.75
C. 0.87
D. 11.4 - Tar yield in the low temperature and high temperature carbonisation of dry coal may be respectively ______________ percent?
A. 3 & 10
B. 10 & 3
C. 10 & 20
D. 15 & 8 - Calorific value of dry wood may be around ______________ Kcal/kg?
A. 5
B. 50
C. 500
D. 5000 - Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?
A. 60
B. 160
C. 500
D. 750
