Chemical Engineering MCQs

Page No. 275

Orsat apparatus is meant for ___________________?


aGravimetric analysis of flue gas

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bFinding ouFinding out combustion efficiencyt combustion efficiency

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cDirect determination of nitrogen in flue gas by absorbing it in ammoniacal cuprous chloride

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dNone of these

✓


View Answer None of these

Yield of coke oven gas in low temperature carbonisation of coal is about ______________ Nm3 /ton of dry coal?


a60

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b160

✓


c500

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d750

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View Answer 160

Blast furnace gas burns with a bluish flame, because of the presence of____________________?


aCO

✓


bCH4

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cCO2

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dS

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View Answer CO

Calorific value of pitch creosote mixture (PCM) i.e., C.T.F.-200 is about________________?


a8800 kcal/m3

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b8800 kcal/kg

✓


cSame as that of coal middling

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d25000 kcal/kg

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View Answer 8800 kcal/kg

Fuel gases containing hydrocarbons (e.g. coke oven gas) are not preheated before burning, mainly because __________________?


aThe hydrocarbons crack thereby choking and fouling the heat transfer surface by carbon soot

✓


bIt reduces its calorific value tremendously

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cIt reduces its flame temperature tremendously

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dThere are chances of explosion during preheating

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Calorific values of both the solid as well as the liquid fuels can be determined by ______________ calorimeter?


aBomb

✓


bBoy’s

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cJunkers

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dNone of these

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View Answer Bomb

Incomplete combustion of fuel in the furnace is judged by high _____________ of the flue gases?


aCO content

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bDew point

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cCO2 content

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dO2 content

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View Answer CO content

Calorific value of bituminous coal may be around ______________ Kcal/kg?


a500

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b1500

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c6500

✓


d20000

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View Answer 6500

Stack heat losses can be minimised by________________?


aControlling the excess air

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bOxygen enrichment of combustion air

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cUsing low c.v. fuels

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dMaintaining proper draft in the furnace

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Method of maintaining fires in furnace during standby periods without undue consumption of fuel is called_________________?


aBack draughting

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bBanking

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cUnder pressurising

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dNone of these

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View Answer Banking

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