Chemical Engineering MCQs

Page No. 300

Deficiency of combustion air during combustion of a gaseous fuel_____________________?


aLengthens the flame


bCauses heat loss of fuel by its partial combustion


cBoth A. & B.


dShortens the flame


View Answer Both A. & B.

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


aPulverised coal


bGaseous fuels


cFuel oil


dNone of these


View Answer Gaseous fuels

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


aLignite


bBituminous coal


cAnthracite coal


dNone of these


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


c250-270


d280-300


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


cCoke oven gas and L.P.G


dBlast furnace gas and naphtha vapor



Preheating of combustion air is done to ___________________?


aIncrease the adiabatic flame temperature


bIncrease the calorific value of the fuel


cComplete the combustion of fuel


dReduce its requirement for effecting the complete combustion



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


a100 to 150


b350 to 450


c550 to 650


d700 to 850


View Answer 350 to 450

Coal containing large quantity of _______________ are difficult to wash?


aAsh


bInherent mineral matter


cFree impurities


dVolatile matter



Narrow coke ovens as compared to wider coke ovens_________________?


aProduce smaller coke


bProduce stronger coke


cRequire less time of carbonisation


dAll A., B. and C.


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


bGCV at constant volume


cNCV at constant pressure


dNCV at constant volume



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