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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