Carburetted water gas
Gobar gas
Natural gas
LPG
✅ The correct answer is option D.
Chemical Engineering MCQs
Which of the following gaseous fuels has the lowest calorific value?
Gobar gas
Refinery gas
Converter gas
Blast furnace gas
✅ The correct answer is option D.
Higher fuel combustion efficiency can not be achieved by
Preheating of fuel gases & combustion air
Reducing sulphur content in the fuel
Adopting proper fuel firing technique & fuel preparation
Supplying correct amount of combustion air
✅ The correct answer is option B.
“Breathing loss” on storage of gasoline occurs due to the
presence of unsaturated air.
fluctuation of ambient temperature during day and night.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option B.
Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to
increase the yield of light distillates.
suppress coke formation.
enhance the octane number of gasoline.
reduce gum content in gasoline.
✅ The correct answer is option B.
Solvent used in duo-sol extraction for lube oil upgradation is a mixture of
propane & phenol-cresol mixture.
methyl ethyl ketone & glycol.
phenol & furfural.
propane & liquid sulphur dioxide.
✅ The correct answer is option A.
Diesel used in naval applications has a minimum cetane number of
25
35
45
65
✅ The correct answer is option C.
Ash content in the middling coal (a byproduct of coal washeries) in India ranges between __________ percent.
15 to 25
35 to 45
55 to 75
75
✅ The correct answer is option B.
Advantages of fluidised bed combustion are
Reduced NOx formation in flue gas
Lower furnace operating temperature
High heat transfer rate
All of the above
✅ The correct answer is option D.
For long flame and easy ignition, the coal used should have
High volatile matter
Low ash
High calorific value
High ash
✅ The correct answer is option A.