Chemical Engineering MCQs

Page No. 311

Theoretical flame temperature of a fuel is that temperature which is attained, when the fuel is completely burnt ‘using theoretical amount of air in___________________?


aAir


bOxygen


cEither A. or B.


dEither A. or B. without gain or loss of heat



__________ is used as jet engine fuel ?


aPetrol


bDiesel


cKerosene


dLPG


View Answer Kerosene

Tar is a better fuel than furnace oil, because of its___________________?


aHigher calorific value


bLower sulphur content


cHigher emissivity (0.8-0.9) resulting in higher radiation heat transfer rate


dBoth A. and B.


View Answer Both A. and B.

In low temperature carbonisation (as compared to high temperature carbonisation) of coal__________________?


aAmmonia yield is more


bAliphatic tar is produced


cFree carbon in tar is more


dAll A., B. and C.



Which of the following will be unsuitable for dust cleaning from flue gas at 400°C from a pulverised coal fired boiler ?


aMulticyclones


bBag filter


cWet scrubber


dHydrocyclones


View Answer Bag filter

Artificial draught produced by a fan can be controlled by the___________________?


aSpeed of the fan


bDamper


cVariation in the pitch of the fan blades


dAll A., B. and C.


View Answer All A., B. and C.

Out of the following, which is the most important parameter for the blast furnace grade coke ?


aCSR & CRI


bAsh content


cMoisture content


dVolatile matter content


View Answer CSR & CRI

Coke having higher porosity has ___________________?


aLower bulk density


bLower strength


cHigher reactivity


dAll A., B. and C.


View Answer All A., B. and C.

Coals used for the generation of producer gas should have ____________________?


aHigh caking index


bLow fusion point of ash


cHigh volatile matter content


dVery low ash content (8-10%)



Caking coal is desirable for_________________?


aBurning on travelling grate


bCoke making


cBurning on firebars


dAll A., B. and C.


View Answer Coke making

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