Chemical Engineering MCQs

Page No. 276

Anthracite coal ____________________?


aContains more volatile matter than bituminous coal

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bIgnites more easily than bituminous coal

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cIs essentially a coking coal

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

✓



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


aFully

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bPartially

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cNot at all

✓


dNegligibly

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View Answer Not at all

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


aBright

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bSplint

✓


cNon-banded

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dBoghead

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View Answer Splint

The function of secondary combustion air is to ______________________?


aPneumatically convey the pulverised coal

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bCompletely burn the volatile matter

✓


cBurn the lumpy coal

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dNone of these

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


a30

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b65

✓


c120

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d180

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View Answer 65

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


aPartial combustion of coal

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bPartial combustion of large size (< 50 mm) coke

✓


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

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

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


aBenzol

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bToluene

✓


cPyridine

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dCerosote

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View Answer Toluene

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


aHeight of the coal heap should be < 3 metres

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bMaximum 200 tons should be stored in a heap

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


aForced draft fan

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bInduced draft fan

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cSteam ejector

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dNatural draft

✓


View Answer Natural draft

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


aM = 1.8 A

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bM = 0.5 A

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cM = 1.1 A

✓


dM = A

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View Answer M = 1.1 A

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