Chemical Engineering MCQs

Page No. 320

Which of the following would require least amount of secondary air for combustion ?


aCoke breeze containing 25% ash and 2% volatile matter

✓


bAnthracite containing 10% volatile matter and 8% ash

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cBituminous coal containing 20% ash and 25% volatile matter

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dSemi-bituminous coal containing 25% ash and 20% volatile matter

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Calorific value of blast furnace gas is around _____________ KCal/Nm3?


a850

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b1800

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c4200

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d6500

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View Answer 850

Nitrogen in coal_________________?


aIs present upto 1-2%

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bComes from protein in parent vegetable matter

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cIs recovered as ammonia during its carbonisation

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dAll A., B. and C.

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View Answer All A., B. and C.

The gas which contributes maximum to the heating value of natural gas is __________________?


aCO

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bCO2

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cH2

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dCH4

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View Answer CH4

To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in___________________?


aShallow and small piles

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bFine sizes without the presence of any lump

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cClosed space without any ventilation facility

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dLarge heaps with small surface to volume ratio

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Washing of coal decreases its_________________?


aCaking index

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bMineral matter content

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cAsh content

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dBoth B. and C.

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In flue gas analysis by Orsat’s apparatus, carbon monoxide is absorbed by__________________?


aCuprous chloride

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bPotassium hydroxide

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cAlkaline pyrogallol solution

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dNone of these

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View Answer Cuprous chloride

_____________ of the coal is the basis for Seylor’s coal classification?


aProximate analysis

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bUltimate analysis

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cCaking index

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dCalorific value

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View Answer Ultimate analysis

The shift conversion reaction taking place during water gas manufacture is given by__________________?


aC + H2O ↔ CO + H2

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bC + 2H2O ↔ CO2 + 2H2

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cCO + H2O ↔ CO2 + H2

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dNone of these

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View Answer CO + H2O ↔ CO2 + H2

Main component of sewage gas produced during anaerobic decomposition of organic waste (by suitable bacteria) during sewage disposal is __________________?


aH2

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bCH4

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cCO2

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dN2

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View Answer CH4

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