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


bPermits the use of low fusion point ash coal


cAccelerates the burning rate and economises on fuel combustion


dAll A., B. and C.



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


aJunker’s


bBomb


cBoy’s


dNone of these


View Answer Bomb

The most matured coal out of the following is__________________?


aLignite


bSemi-anthracite


cSub-bituminous


dBituminous


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


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


dNone of these



Ignition temperature decreases progressively from anthracite to lignite, because___________________?


aVolatile matter content increases


bCarbon content decreases


cMoisture content increases


dAsh content increases



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


cSewage gas and gobar gas


dB.F. gas and coke oven gas


View Answer Propane and acetylene

A good metallurgical coke should have very low__________________?


aSulphur & phosphorous content


bPorosity


cFusion point of its ash


dHardness & strength



Washing of coal________________?


aReduces its sulphur and ash content


bControls its ash fusibility and increases its calorific value


cImproves its coking properties


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


bOrigin of coal


cCoalification


dVariation of coal quality with depth


View Answer Origin of coal

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


aColour


bMoisture content


cAsh content


dVolatile matter


View Answer Volatile matter

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