Chemical Engineering MCQs

Page No. 295

Calorific value of coke oven gas is around ______________ Kcal/Nm3?


a900


b4200


c7500


d2000


View Answer 4200

Caking index of coal blend used for blast furnace coke making is about_________________?


a8


b12


c22


d36


View Answer 22

A coal with high ash content___________________?


aHas higher calorific value


bIs harder and stronger


cIs not subjected to washing


dHas low quantity of mineral matter



Which of the following is not a binder for coal briquetting ?


aCoal tar


bBitumen


cMolasses


dNone of these


View Answer None of these

Coking time in beehive coke oven is about ___________________?


a12 hours


b2-3 days


cOne week


dTwo weeks


View Answer 2-3 days

Which of the following is not increased by using preheated combustion air in place of ordinary air at room temperature ?


aCalorific value of the fuel


bFlame temperature achieved


cSpeed of combustion of fuel


dHeat transfer rate to the stock in the furnace



The heat of combustion of a fuel___________________?


aIs equal to the heat of formation


bIs always negative


cCan’t be known without calculating it


dIs always positive


View Answer Is always negative

KOH solution used in Orsat apparatus absorbs____________________?


aCO2


bSO2


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

In high temperature carbonisation of coal compared to low temperature carbonisation ?


aYield of ammonia is less


bAromatic content of tar is low


cH2 content in the coke oven gas is more


dCalorific value of the coke oven gas is lower



Presence of free moisture in coal during its high temperature carbonisation _____________________?


aReduces the coking time


bProtects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls


cIncreases the loss of fine coal dust from the ovens when charging


dNone of these



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