Chemical Engineering MCQs

Page No. 300

Deficiency of combustion air during combustion of a gaseous fuel_____________________?


aLengthens the flame

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bCauses heat loss of fuel by its partial combustion

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cBoth A. & B.

✓


dShortens the flame

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View Answer Both A. & B.

Junker’s calorimeter is used to determine the calorific value of______________________?


aPulverised coal

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bGaseous fuels

✓


cFuel oil

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dNone of these

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View Answer Gaseous fuels

Which of the following can be made into briquettes without the use of a binder ?


aLignite

✓


bBituminous coal

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cAnthracite coal

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dNone of these

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View Answer Lignite

Light oil whose major component is Benzol, is obtained by the distillation of crude tar in the temperature range of _____________ °C?


a80-170

✓


b200-300

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c250-270

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d280-300

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View Answer 80-170

‘Mixed gas’ used in steel plants is a mixture of___________________?


aB.F. gas and coke oven gas

✓


bCoke oven gas and converter gas

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cCoke oven gas and L.P.G

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dBlast furnace gas and naphtha vapor

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Preheating of combustion air is done to ___________________?


aIncrease the adiabatic flame temperature

✓


bIncrease the calorific value of the fuel

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cComplete the combustion of fuel

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dReduce its requirement for effecting the complete combustion

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The temperature at which plastic layer formation takes place during carbonisation of coal varies from ______________ °C ?


a100 to 150

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b350 to 450

✓


c550 to 650

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d700 to 850

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View Answer 350 to 450

Coal containing large quantity of _______________ are difficult to wash?


aAsh

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bInherent mineral matter

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cFree impurities

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dVolatile matter

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Narrow coke ovens as compared to wider coke ovens_________________?


aProduce smaller coke

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bProduce stronger coke

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cRequire less time of carbonisation

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dAll A., B. and C.

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View Answer All A., B. and C.

Bomb calorimeter is used to determine the (where, GCV – Gross Calorific Value. NCV – Net Calorific Value.) ?


aGCV at constant pressure

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bGCV at constant volume

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cNCV at constant pressure

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dNCV at constant volume

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