Natural gas
Coal bed methane (CBM)
Liquefied petroleum gas (LPG)
Sewage gas
✅ The correct answer is option C.
Chemical Engineering MCQs
A fuel containing carbon and carbon monoxide (but containing no hydrogen or its compounds) is burnt in pure oxygen at constant pressure. Its gross calorific value as compared to net calorific value will be
More
Less
Same
Data insufficient; can’t be predicted
✅ The correct answer is option C.
Coke oven gas is a better fuel than blast furnace gas, because of its higher
Calorific value, cleanliness and relatively low distribution cost (due to its low specific gravity)
Adiabatic flame temperature
Heat release rate (thus requiring smaller combustion chamber)
All of the above
✅ The correct answer is option D.
With increase in the number of carbon and hydrogen atoms in hydrocarbon molecules, the density of petroleum products
decreases
increases
remains same
unpredictable from the data
✅ The correct answer is option B.
Presence of free moisture in coal is most disadvantageous during
Its pulverisation (as it requires more power)
Combustion of fire slacks on the grates
Handling (e.g. when emptying wagons)
None of these
✅ The correct answer is option A.
Which is almost absent in crude petroleum?
Olefins
Mercaptans
Naphthenes
Cycloparaffins
✅ The correct answer is option A.
Which parameter is used for the grading of paraffin waxes ?
Specific gravity
Melting point
Viscosity
Penetration number
✅ The correct answer is option C.
Which of the following has the maximum °API gravity of all?
Diesel
Kerosene
Petrol
Furnace oil
✅ The correct answer is option C.
Improper storage condition results in the weathering of coal and spontaneous combustion, which increases its
Caking index
Yield of carbonised products
Friability & oxygen content
Calorific value
✅ The correct answer is option C.
In catalytic cracking process, olefins crack __________ times faster than in thermal cracking process.
100
200-300
1000-10000
10
✅ The correct answer is option C.