Chemical Engineering MCQs

Page No. 294

The ratio of % total carbon obtained in the ultimate analysis of coke and % fixed carbon obtained in the proximate analysis is always ___________________?


a1


b< 1


c> 1


dUnpredictable


View Answer > 1

Low temperature oxidation and spontaneous combustion of freshly mined coal is accentuated, if __________________?


aIt contains large amount of volatile matter


bIt is stored in tall heaps


cSmaller fines are stored in large quantity


dAll A., B. and C.


View Answer All A., B. and C.

If the specific heat of gaseous products of combustion of a fuel is high, the abiabatic flame temperature will be_____________?


aLow


bHigh


cVery high, if the fuel is of low calorific value


dNone of these


View Answer Low

The main advantage of forced draft over natural draft is that____________________?


aCombustion of fuel is complete


bSmaller height chimney can be used


cFurnace control is easier


dAll A., B. & C.


View Answer All A., B. & C.

Oxygen percentage (by weight) in atmospheric air is_________________?


a19


b21


c23


d29


View Answer 23

Gasification of the solid fuel converts its organic part into combustible by interaction with air/oxygen and steam so as to obtain a secondary gaseous fuel of high calorific value having no ash. Gasification reactions are normally carried out at about _____________ °C?


a400-500


b900-1000


c1400-1500


d1700-1800


View Answer 900-1000

Oxygen content in a flue gas was found to be 4%. It implies that excess air used for combustion was around ______________ percent?


a4


b96


c20


d40


View Answer 20

Which of the following is not a by-product fuel ?


aSewage gas


bRefinery gas


cProducer gas


dBagasse


View Answer Producer gas

Sulphur in metallurgical coal__________________?


aContributes to its heating value


bAffects the quality of steel produced as cracks develop on the surface while rolling the steel


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

Fusion point of coal ash increases with increase in its ____________ content?


aIron sulphate


bIron silicate


cLime and magnesia


dAll A., B. and C.


View Answer All A., B. and C.

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