A. Emissivity factor is higher
B. Sulphur content is lower
C. Flue gas has lower dew point thereby facilitating more waste heat recovery
D. All A., B. and C.
Related Mcqs:
- Optimum preheating temperature for pitch creosote mixture (PCM) which is also termed as C.T.F-200, before atomisation through burners is_________________?
A. 200 °F
B. 200 °C
C. 200 °K
D. 200 °R - Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?
A. 8800 kcal/m3
B. 8800 kcal/kg
C. Same as that of coal middling
D. 25000 kcal/kg - Explosion limit of blast furnace gas is 37 to 71% gas in gas-air mixture. It means that the blast furnace gas will explode when burnt in a confined space, if its concentration in the gas-air mixture is _______________ percent?
A. 71%
C. In between 37 & 71%
D. None of these - Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ______________°C?
A. 70
B. 85
C. 105
D. 145 - 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 - Tar is a better fuel than furnace oil, because of its___________________?
A. Higher calorific value
B. Lower sulphur content
C. Higher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate
D. Both A. and B. - A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be_________________?
A. More
B. Less
C. Same
D. Data insufficient; can’t be predicted - Coke oven gas is a better fuel than blast furnace gas, because of its higher________________?
A. Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
B. Adiabatic flame temperature
C. Heat release rate (thus requiring smaller combustion chamber)
D. All A., B. and C. - Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?
A. 400-500
B. 900-1000
C. 1400-1500
D. 1700-1800 - Eschka mixture, which is used for the determination of sulphur in coal, is a mixture of _____________________?
A. MgO & Na2CO3
B. MgSO4 & BaCl2
C. BaSO4 & NaCl
D. MgCO3 & NaCl
