Fuels and Combustion - Chemical Engineering Questions and Answers

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L.D. converter gas (produced in steel plant) comprises mainly of

CO (upto 65%) & CO₂

CO₂ & H₂

CO & O₂

CO₂ & O₂

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Main constituents of purified Lurgi gas are

H₂, C_mH_n & CO₂

CO, H₂ & CH₄

CO₂, O₂ & CO

N₂, H₂ & CO₂

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Catalyst used in Fischer-Tropsch process is

nickel

zinc oxide

alumina

thorium oxide

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Which of the following coal gasification processes will produce gas having maximum methane content ?

Winkler process.

Lurgi process.

Kopper-Totzek process.

All can produce same methane content.

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Which will have the least volatile matter and hence will be the most difficult to ignite?

Bituminous coal

Coke

Semi-bituminous coal

Aanthracite

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Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around __________ percent.

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As time passes, the calorific value of stored coal

decreases

increases

remains unaltered

may increase or decrease (depends on the method of storage).

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Stack (chimney) height in a big thermal power plant is dictated by the

pollution control aspect.

draught to be created.

limitation of constructional facilities.

none of these.

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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

is less liable to spontaneous combustion on storage.

is more difficult to ignite and produces a shorter flame.

requires smaller combustion space and less secondary air.

none of these.