Fuels and Combustion-Data Intensity 4 Multiple Questions and Answers.




1.Calorific value of blast furnace gas is around ____ KCal/Nm3?
A. 850
B. 1800
C. 4200
D. 6500

2.Which of the following would require least amount of secondary air for combustion ?
A. Coke breeze containing 25% ash and 2% volatile matter
B. Anthracite containing 10% volatile matter and 8% ash
C. Bituminous coal containing 20% ash and 25% volatile matter
D. Semi-bituminous coal containing 25% ash and 20% volatile matter

3.Bulk density of pulverised coal may be about ____ kg/m3?
A. 100
B. 500
C. 1000
D. 1500

4.Bunsen burner is an example of a/an ______ burner?
A. Inside mixing/premix type
B. Submerged combustion
C. Rotary cup
D. Outside mixing/diffusion flame/nozzle mix type

5.The main drawback of supplying more excess air in the combustion of fuel is the____?
A. Excessive power requirement of air blower
B. Excessive power requirement of air blower
C. Intermittent and uncontrolled combustion of the fuel
D. High exit flue gas temperature from the furnace

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