- A. Is less liable to spontaneous combustion on storage
- B. Is more difficult to ignite and produces a shorter flame
- C. Requires smaller combustion space and less secondary air
- D. None of these
Fuels and Combustion
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A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon_____.
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Percentage of carbon monoxide in blast furnace gas may be around_____.
- A. 8
- B. 14
- C. 22
- D. 52
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Which of the following will generate maximum volume of product of complete combustion (Nm³/Nm³ of fuel) ?
- A. Carburetted water gas
- B. Blast furnace gas
- C. Natural gas
- D. Producers
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Pick out the wrong statement.
- A. Percentage of ash in coke produced from medium coking coal is more than that in coal
- B. The calorific value (kcal/Nm³) of coke oven gas reduces on removal of hydrogen from it by cryogenic method
- C. Ash is normally removed as
- D. Coal based fertiliser plants in India at Talcher (Orissa) and Ramagundam (A.P) employ Kopper-Totzek process of coal gasification
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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
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Bituminous coal_____.
- A. Ignites less easily than anthracite
- B. Is generally coking
- C. Burns with smoky yellow flame
- D. Both B and C
-
Gobar gas is produced by the _____ of cown dung.
- A. Fermentation
- B. Oxidation
- C. Hydrogenation
- D. None of these
-
Which of the following is a lean fuel gas?
- A. Coke oven gas
- B. LPG
- C. Blast furnace gas
- D. Natural gas
-
During combustion of gaseous fuels, deficiency of air_____.
- A. Lengthens the flame
- B. Tends to shorten the flame
- C. Does not affect the flame length
- D. Increases the flame temperature
-
Which of the following combustibles is absent in blast furnace gas?
- A. H₂
- B. CH₄
- C. CO
- D. None of these