Fuels And Combustion Mcqs
Q.1: Pick out the wrong statement ?
A. Percentage of ash in coke produced from medium coking coal is more than that in coalT
B. The calorific value (kcal/Nm3) of coke oven gas reduces on removal of hydrogen from it byY
C. cryogenic method
D. Ash is normally removed as fly-ash in Kopper-Totzek process of coal gasificationV
Q.2: Pick out the wrong statement ?
A. Carburetted water gas is also called blue gas-
B. Coals are divided in four species according to their carbon content in Seylors classification`
C. Carbonisation time in a by-product coke oven is about 16 hours>
D. Gross and net calorific value of a fuel is the same, if it does not contain hydrogen orW
Q.3: Coal tar (produced by high temperature carbonization) is the main source of_________?U
A. Aromatic compounds
B. Aliphatic compounds
C. Paraffins
D. Olefins
Q.4: White flue gas (resembling steam) coming out of the chimney of a thermal power plant indicates that the fuel used in the boiler furnace is_______?
A. Tar
B. Sulphide Coke
C. Coke Oven Gas
D. Pulverised coke
Q.5: Pick out the wrong statement ?
A. LPG is also used as fuel for automobiles & small furnaces and for cutting & welding ofV
B. metals
C. The minimum temperature, at which a petroleum oil vapor catches fire and continues to burn,[
D. is called its flash point
Q.6: Pick out the wrong statement ?
A. High concentration of oxygen in flue gas means high stack loss>
B.
C. The ratio of fixed carbon to volatile matter percentage in coal is called its fuel ratio^
D. Calorific value of natural gas is more than that of LPG7
Q.7: Pick the odd man out?
A. Briquettes
B. Wood
C.
D. Pitch creosote mixture
Q.8: Carbon Content by weight in air dried wood may be about _______________ percent?P
A. 10
B. 25
C. 50
D. 80
Q.9: Which of the following has the least calorific value (kcal/Nm3) ?A
A. Blast furnace gas
B. Coke oven gas
C. Sewage gas
D. Natural gas
Q.10: Turndown ratio of a gas burner is equal to the __________________ ?C
A. Maximum to minimum heat input ratio#
B. Maximum to minimum permissible gas flow rate,
C. Both &
D. Minimum to maximum heat input ratio#

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