Low
High
Very high, if the fuel is of low calorific value
None of these
✅ The correct answer is option A.
Chemical Engineering MCQs
Gobar gas is produced by the __________ of ‘gobar’ (cow dung).
Hydrolysis
Fermentation
Oxidation
Dehydration
✅ The correct answer is option B.
Preheating of combustion air is done to
Increase the adiabatic flame temperature
Increase the calorific value of the fuel
Complete the combustion of fuel
Reduce its requirement for effecting the complete combustion
✅ The correct answer is option A.
Blast furnace gas burns with a bluish flame, because of the presence of
CO
CH₄
CO₂
S
✅ The correct answer is option A.
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
Is less liable to spontaneous combustion on storage
Is more difficult to ignite and produces a shorter flame
Requires smaller combustion space and less secondary air
None of these
✅ The correct answer is option D.
For the case of a fuel gas undergoing combustion with air, if the air/fuel ratio is increased, the adiabatic flame temperature will
Increase
Decrease
Increase or decrease depending on the fuel type
Not change
✅ The correct answer is option B.
Which of the following can be made into briquettes without the use of a binder?
Lignite
Bituminous coal
Anthracite coal
None of these
✅ The correct answer is option A.
Use of pulverised coal in boiler furnace provides
High calorific value
Better combustion
Smokeless burning
Less erosion on furnace walls
✅ The correct answer is option B.
Removal of hydrogen from coke oven gas
Increases its calorific value
Decreases its calorific value
Does not alter its calorific value
Is not possible on commerical scale
✅ The correct answer is option A.
Coking time in narrow by-product coke ovens is around __________ hours.
18
48
8
80
✅ The correct answer is option A.