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.Management Sciences
Category: Fuels and Combustion
Percentage of nitrogen in blast furnace gas may be around__________________?
A. 5
B. 25
C. 55
D. 80
Function of secondary air in pulverised coal firing is to_________________?
A. Transport the coal to the burner
B. Dry the coal
C. Ensure efficient burning of coal around the burner
D. Reduce primary air requirement
A good coking coal should have high ______________ content?
A. Ash
B. Sulphur & phosphorus
C. Moisture
D. None of these
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
Flue gas from the heating chamber of by product coke ovens is removed by________________?
A. Forced draft fan
B. Induced draft fan
C. Steam ejector
D. Natural draft
The shift conversion reaction taking place during water gas manufacture is given by__________________?
A. C + H2O ↔ CO + H2
B. C + 2H2O ↔ CO2 + 2H2
C. CO + H2O ↔ CO2 + H2
D. None of these
The hottest part of the flame lies in its _______________ zone?
A. Non-luminous
B. Luminous
C. Yellow
D. Unburnt gases
The main advantage of forced draft over natural draft is that____________________?
A. Combustion of fuel is complete
B. Smaller height chimney can be used
C. Furnace control is easier
D. All A., B. & C.
_____________ prohibits the use of alcohols directly in petrol engines ?
A. Low octane number
B. High cost & availability
C. Low flash point
D. Low calorific value
With increase in moisture content of coal, its___________________?
A. Calorific value increases
B. Caking properties diminish
C. Swelling during carbonisation becomes excessive
D. None of these
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