Chemical Engineering MCQs

Page No. 287

Percentage of nitrogen in blast furnace gas may be around__________________?


a5

✖


b25

✖


c55

✓


d80

✖


View Answer 55

During coking of coal, the ash content (percentage)________________?


aIncreases

✓


bDecreases

✖


cRemain constant

✖


dNone of these

✖


View Answer Increases

Stack (chimney) height in a big thermal power plant is dictated by the___________________?


aPollution control aspect

✖


bDraught to be created

✓


cLimitation of constructional facilities

✖


dNone of these

✖


View Answer Draught to be created

The lowest temperature, at which a solid fuel produces enough vapors to support continuous combustion, is called ?


aFire point

✖


bSmoke point

✖


cBurning temperature

✓


dKindling temperature

✖


View Answer Burning temperature

Ash content in the coke produced from a coking coal having 20% ash may be around _____________ percent?


a6

✖


b12

✖


c18

✖


d24

✓


View Answer 24

The calorific value is the highest out of the following for__________________?


aProducer gas

✖


bWater gas

✖


cCoke oven gas

✓


dBlast furnace gas

✖


View Answer Coke oven gas

A coal having high ratio of volatile matter to fixed carbon as compared to a coal having low ratio of volatile matter to fixed carbon _________________?


aIs less liable to spontaneous combustion on storage

✖


bIs more difficult to ignite and produces a shorter flame

✖


cRequires smaller combustion space and less secondary air

✖


dNone of these

✓


View Answer None of these

Kopper-Totzek coal gasifier (installed in a coal based nitrogeneous fertiliser plant) employs a/an ______________ bed gasifier?


aEntrained

✓


bMoving

✖


cFixed

✖


dFluidised

✖


View Answer Entrained

Ionisation potential applied across the electrodes of electrostatic tar precipitator is around_____________________?


a230 V AC

✖


b60 KV AC

✖


c230 V DC

✖


d60 KV DC

✓


View Answer 60 KV DC

Coal tar (produced by high temperature carbonisation) is the main source of_________________?


aAromatic compounds

✓


bAliphatic compounds

✖


cParaffins

✖


dOlefins

✖


View Answer Aromatic compounds

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