Chemical Engineering MCQs

Page No. 285

The advantage of firing pulverised coal in the furnace lies in the fact, that it____________________?


aPermits the use of high ash content coal

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bPermits the use of low fusion point ash coal

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cAccelerates the burning rate and economises on fuel combustion

✓


dAll A., B. and C.

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Calorific value of both the solid & liquid fuels can be determined by using ______________ calorimeter?


aJunker’s

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bBomb

✓


cBoy’s

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dNone of these

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View Answer Bomb

The most matured coal out of the following is__________________?


aLignite

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bSemi-anthracite

✓


cSub-bituminous

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dBituminous

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View Answer Semi-anthracite

(64-132) rank coal (ASTM) means a coal with 64%___________________?


aFixed carbon and having a heat value of 13, 200 BTU/1b

✓


bAsh and a heating value of 13, 200 BTU/1b

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cFixed carbon and a heating value of 132 BTU/1b

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dNone of these

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Ignition temperature decreases progressively from anthracite to lignite, because___________________?


aVolatile matter content increases

✓


bCarbon content decreases

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cMoisture content increases

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dAsh content increases

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For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm3), while the C.V. is same on weight basis (i.e., kcal/kg) ?


aPropane and acetylene

✓


bPropane and LPG

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cSewage gas and gobar gas

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dB.F. gas and coke oven gas

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View Answer Propane and acetylene

A good metallurgical coke should have very low__________________?


aSulphur & phosphorous content

✓


bPorosity

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cFusion point of its ash

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dHardness & strength

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Washing of coal________________?


aReduces its sulphur and ash content

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bControls its ash fusibility and increases its calorific value

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cImproves its coking properties

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dAll A., B. and C.

✓


View Answer All A., B. and C.

Insitu theory and drift theory are related to the____________________?


aOrigin of petroleum oil

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bOrigin of coal

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cCoalification

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dVariation of coal quality with depth

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View Answer Origin of coal

Degree of carbonisation of coal during coke making can be roughly judged by the ______________ of the coke produced?


aColour

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bMoisture content

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cAsh content

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dVolatile matter

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View Answer Volatile matter

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