Chemical Engineering MCQs

Page No. 303

When steam is passed over coal resulting in the endothermic reaction represent by, C + H2O = CO + H2, it is called the _______________ of coal?


aCarbonisation

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bOxidation

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cCoalification

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dGasification

✓


View Answer Gasification

Flue gas discharge velocity through chimney of a big thermal power plant may be around ________________ m/sec?


a0.5

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b10

✓


c50

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d500

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View Answer 10

Bomb calorimeter is used for the determination of calorific value of the _____________ fuels?


aGaseous

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bSolid

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cLiquid

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dBoth B. and C.

✓


View Answer Both B. and C.

Coke ovens in steel plant are heated by ___________________?


aElectricity

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bCoke oven gas

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cMixed gas

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dBoth B. & C.

✓


View Answer Both B. & C.

Soft coke is not ___________________?


aProduced by low temperature carbonisation of coal

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bA domestic fuel

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cUsed in blast furnaces

✓


dNone of these

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Percentage of hydrogen in coke oven gas may be around ___________________?


a10

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b25

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c45

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d60

✓


View Answer 60

A coal with high ash content is undesirable, as________________?


aIt is abrasive to the coal pulveriser (i.e. ball mill) and the combustion chamber

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bThe ash in molten condition gets absorbed in the pores of the refractory lining of the furnace and causes its spalling due to different co-efficient of expansion/contraction of the refractory and the ash

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c The ash retains the sulphur & phosphorus and thus affects the quality of products in metallurgical furnace apart from increasing the slag volume. Besides, it may fuse and stick to the boiler tubes thereby reducing the heat transfer

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dAll A., B. and C.

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View Answer All A., B. and C.

Which of the following is the most poisonous gas ?


aCoke oven gas

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bProducer gas

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cBlast furnace gas

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dL.D. converter gas

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View Answer L.D. converter gas

Gross heating value of coal is ______________ the net heating value?


aHigher than

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bLower than

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cSame as

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dEither A. or B.; depends on the type of coal

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View Answer Higher than

Which of the following accentuates clinkering trouble on furnace grate burning coal ?


aLow reactivity of carbonised residue containing high proportions of iron & sulphur

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bLow forced draught and fuel bed temperature

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cThick fire bed and preheated primary air

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dAll A., B. and C.

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View Answer All A., B. and C.

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