All tar is evolved at < 600°C
Evolution of H₂ and formation of methane and aromatics occur at > 700°C
Hard semi-coke starts shrinking at 600°C
All of the above
✅ The correct answer is option D.
Chemical Engineering MCQs
Which of the following oil gasification processes is non-catalytic?
Semet-Solvay process
Segas process
Onia-Gegi process
Steam reforming of naphtha
✅ The correct answer is option A.
Which of the following reactions occuring during coal gasification is called the Neumann reversal reaction?
2CO ⟷ C + CO₂
CO + H₂O ⟷ CO₂ + H₂
C + H₂O ⟷ CO + H₂
C + 2H₂O ⟷ CO₂ + 2H₂
✅ The correct answer is option A.
The temperature at which plastic layer formation takes place during carbonisation of coal varies from __________ °C.
100 to 150
350 to 450
550 to 650
700 to 850
✅ The correct answer is option B.
Washing of coal
Reduces its ash & sulphur content
Improves its coking properties
Increase the fusion point of its ash by removing chlorine compounds
All of the above
✅ The correct answer is option D.
Pulverised coal used in boiler firing need not have
Less moisture content
High fusion point of its ash
High bulk density
Lower ash content
✅ The correct answer is option B.
When steam is passed over coal resulting in the endothermic reaction represent by, C + H₂O = CO + H₂, it is called the __________ of coal.
Carbonisation
Oxidation
Coalification
Gasification
✅ The correct answer is option D.
Percentage of nitrogen in blast furnace gas may be around
5
25
55
80
✅ The correct answer is option C.
Width of the coke oven towards coke side is slightly more than that on pusher side to
Facilitate easy discharging of coke as it swells during carbonisation
Facilitate uniform heating of the oven
Increase the output of the coke
None of these
✅ The correct answer is option A.
Yield of blast furnace gas is about __________ Nm³ /ton of pig iron.
300
2000
5000
10000
✅ The correct answer is option B.