Fuels and Combustion

1."Micum Index" of a coke is a measure of its

1. Reactivity
2. Porosity
3. Bulk density
4. Hardness & strength

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2."Overfire burning" in a furnace is a phenomenon characterised by the

1. Supply of excess fuel
2. Supply of excess air
3. Burning of carbon monoxide and other incombustibles in upper zone of furnace by supplying more air
4. None of these

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3.'Fat coals' are those coals which have very high

1. Caking capacity
2. Volatile matter content
3. Fusion point of its ash
4. Inherent moisture content

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4.'Fat' coal means a coal having

1. Low calorific value
2. High volatile matter
3. Low ash content
4. Non smoking tendency

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5.'Fuel' can be defined as a substance which produces heat by

1. Combustion
2. Nuclear fission
3. Nuclear fusion
4. All (A), (B) & (C)

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6.'Mixed gas' used in steel plants is a mixture of

1. B.F. gas and coke oven gas
2. Coke oven gas and converter gas
3. Coke oven gas and L.P.G
4. Blast furnace gas and naphtha vapor

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7.'Wind loss' resulting from unscientific storage of coal may be the order of about _________ percent.

1. 2.5
2. 7.5
3. 10.5
4. 14.5

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8.'Wobbe index' is a characteristic of

1. Solid fuels
2. Gaseous fuels
3. Liquid fuels
4. Fat coals

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9._________ has the widest inflammability limit (explosion limit) of all the gases.

1. Hydrogen
2. Carbon monoxide
3. Acetylene
4. Methane

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10._________ is used as jet engine fuel.

1. Petrol
2. Diesel
3. Kerosene
4. LPG

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