Chemical Engineering MCQs

Page No. 22

The reason for excessive clinker formation in gas producers is the_____________________?


aUse of coal/coke containing a high % of fines and ash

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bUse of fuel having too low an ash fusion temperature

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cDevelopment of hot spots in the fuel bed and an abnormally high rate of gasification

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dAll A., B. and C.

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View Answer All A., B. and C.

In furnaces operating at very high temperature (say) 1250°C, e.g. soaking pit), the maximum heat transfer takes place by__________________?


aConduction

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bConvection

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cRadiation

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dCannot be predicted

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View Answer Radiation

Pick out the wrong statement?66641


aThe toughness of a material decreases, when it is heated

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bCrane hooks are normally made of wrought iron

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cCold working of a metal decreases its fatigue strength

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dThe temperature at which new grains are formed in a metal is known as the recrystallisation temperature

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Amount of coal lost in ash particle, which is carried through the boiler system, depends upon the__________________?


aPhysical nature, ash content and fineness of the coal

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bAmount of excess air supplied and load on the boiler

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cType of burner and combustion chamber

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dAll A., B. and C.

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View Answer All A., B. and C.

Coke ovens in steel plant are heated by____________________?


aElectricity

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bBlast furnace gas/mixed gas

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cCoke oven gas

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dBoth B. and C.

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View Answer Both B. and C.

Which of the following does not come under the category of ‘secondary nutrient’ for plant growth ?


aCalcium

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bMagnesium

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cSulphur

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dOxygen

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View Answer Oxygen

Specific heating capacity of a furnace is expressed as_____________________?


aWeight heated/hr

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bWeight heated/furnace volume

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cWeight heated/hr/furnace volume

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dNone of these

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Unit of furnace loading is____________________?


aTon stock/hr/m2 hearth area

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bTon stock/hr

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cTon stock/m2 hearth area

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dBoth B. and C.

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Which of the following fertilizers is used as a cattle feed ?


aUrea

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bCalcium ammonium nitrate

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cSuperphosphate

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dAmmonium sulphate

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View Answer Urea

Thermal efficiency of a limestone calcination rotary kiln may be around ______________ percent?


a20

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b40

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c65

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d80

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View Answer 40

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