Chemical Engineering MCQs

Page No. 289

High temperature carbonisation of coal produces__________________?


aInferior coke compared to low temperature carbonisation

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bLess of gases compared to liquid products

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cLarge quantity of tar compared to low temperature carbonisation

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dNone of these

✓


View Answer None of these

Gobar gas constitutes mainly of___________________?


aCH4 & CO2

✓


bCO & CO2

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cCH4 & N2

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dCO & N2

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View Answer CH4 & CO2

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


aWinkler process

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bLurgi process

✓


cKopper-Totzek process

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dAll can produce same methane content

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View Answer Lurgi process

During the carbonisation of coal__________________?


aAll tar is evolved at 700°C

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bHard semi-coke starts shrinking at 600°C

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cA

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dAll A., B. and C.

✓


View Answer All A., B. and C.

A coal that softens and fuses on heating is_________________?


aClassified

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bCarbonised

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cCaking

✓


dNon-caking

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View Answer Caking

Main use of soft coke is as _______________ fuel?


aDomestic

✓


bBlast furnace

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cFoundry

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dNone of these

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View Answer Domestic

Gas yield in the Kopper-Totzek coal gasifier is about ______________ Nm3/ton coal (ash = 35%)?


a150

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b1500

✓


c3500

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d5000

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View Answer 1500

Height of coke oven is limited (say maximum upto 7 metres) mainly by the_____________________?


aProblem of uniform heating along its height

✓


bStructural strength of silica bricks

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cProblem in door cleaning

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dBuckling of ram of pusher car at the time of coke pushing

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Steam is intermittently admitted into the fuel bed during the production of producer gas to__________________?


aConvert CO to CO2

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bIncrease the combustion rate

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cIncrease the gas production rate

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dMinimise the chances of clinker formation

✓



Which of the following coke has the least percentage of ash ?


aPetroleum coke

✓


bBeehive coke

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cFoundry coke

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dMetallurgical coke

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View Answer Petroleum coke

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