Q. A sample of natural gas containing 80% methane (CH₄) and rest nitrogen (N₂) is burnt with 20% excess air. With 80% of the combustibles producing CO₂ and the reminder going to CO, the Orsat analysis in volume percent is

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Q. Which of the following would require maximum amount of % excess air for complete combustion ?

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Q. During combustion of a gaseous fuel, the presence of a non-luminous flame is an indication of the

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Q. Flue gas obtained on complete combustion of pure acetylene (a hydrocarbon fuel) will contain

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Q. Low temperature oxidation of coal is accelerated by the

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Q. By-products recovery process from coal carbonisation is termed as direct, indirect and semi direct process depending upon the method of recovery of

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Q. Naphthalene is removed from coke oven gas by

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Q. Coke oven gas compared to blast furnace gas is

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Q. Hardgrove grindability index of four coal samples are given below. Which of them is the easiest to grind ?

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Q. Which is the heaviest fuel gas out of the following ?

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Q. Calorific value of tar is about __________ Kcal/kg.

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Q. Efficiency of the combustion of a fuel is judged by the __________ the flue gas.

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Q. Tolerable concentration of toxic carbon monoxide in atmospheric air is about __________ PPm.

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Q. Rate of low temperature oxidation of coal due to bad storage conditions

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Q. Pick the odd man out.

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Q. Power alcohol as compared to straight run gasoline has lower

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Q. When the coal is heated in absence of air, it is called its

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Q. C.V. (kcal/Nm³) of gaseous fuels __________ with increase in molecular weight.

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Q. Shatter index of the coke is a measure of its

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Q. Narrow coke ovens as compared to wider coke ovens

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