Chemical Engineering MCQs

Page No. 276

Anthracite coal ____________________?


aContains more volatile matter than bituminous coal


bIgnites more easily than bituminous coal


cIs essentially a coking coal


dBurns with short, bluish, yellow-tipped flame producing very little smoke



By-products are _____________ recovered in ‘Beehive ovens’ ?


aFully


bPartially


cNot at all


dNegligibly


View Answer Not at all

A coal containing very high percentage of durain is called ______________ coal?


aBright


bSplint


cNon-banded


dBoghead


View Answer Splint

The function of secondary combustion air is to ______________________?


aPneumatically convey the pulverised coal


bCompletely burn the volatile matter


cBurn the lumpy coal


dNone of these



Temperature of coke oven gas just before entering into saturator (for recovery of NH3) is about ______________ °C?


a30


b65


c120


d180


View Answer 65

Producer gas containing least amount of tar is produced by the_________________?


aPartial combustion of coal


bPartial combustion of large size (< 50 mm) coke


cHigh pressure gasification of coal (e.g. in Lurgi gasifier)


dAtmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)



Which of the following is used for making the explosive „TNT‟ ?


aBenzol


bToluene


cPyridine


dCerosote


View Answer Toluene

Safe condition for storage of high V.M. bituminous coal is that ___________________?


aHeight of the coal heap should be < 3 metres


bMaximum 200 tons should be stored in a heap


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Flue gas from the heating chamber of by product coke ovens is removed by________________?


aForced draft fan


bInduced draft fan


cSteam ejector


dNatural draft


View Answer Natural draft

Mineral matter, ‘M’ and ash percentage ‘A’ in coal are roughly related as_______________?


aM = 1.8 A


bM = 0.5 A


cM = 1.1 A


dM = A


View Answer M = 1.1 A

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