2581. Which of the following has the highest viscosity of all (at a given temperature) ?
Naphtha
Fuel oil
Light diesel oil
Petrol
✅ The correct answer is option B.
Chemical Engineering
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2582. To avoid fire by spontaneous combustion of coal due to its low temperature oxidation, it should be stored in
Shallow and small piles
Fine sizes without the presence of any lump
Closed space without any ventilation facility
Large heaps with small surface to volume ratio
✅ The correct answer is option A.
2583. Which of the following has the highest theoretical flame temperature ?
Blast furnace gas
Hydrogen
Acetylene
Coke oven gas
✅ The correct answer is option C.
2584. The main function of primary air in pulverised coal fired burner is to
Burn CO to CO₂
Dry and transport the coal
Have proper combustion by supplying it around the burner
Preheat the tertiary air used for complete combustion of CO to CO₂
✅ The correct answer is option B.
2585. Which of the following is not a ‘manufactured’ fuel?
LPG
Coal briquettes
Tar
Colloidal fuels
✅ The correct answer is option C.
2586. Spontaneous combustion of coal on storage results due to
Inadequate ventilation
Low temperature oxidation
Storage in large heaps with small surface to volume ratio
All of the above
✅ The correct answer is option D.
2587. CnH2n is the general formula for
olefins
naphthenes
both (a) and (b)
neither (a) nor (b)
✅ The correct answer is option C.
2588. Benzene is used
As a motor fuel
As an explosive
For making insecticides (e.g., DDT, BHC etc.), detergent & rubber (SBR)
As a perfume
✅ The correct answer is option C.
2589. ‘Solvent naphtha’ used mostly as a solvent in paints and perfumery is produced by the __________ of virgin naphtha into small boiling range cuts.
steam reforming
distillation
desulphurisation
none of these
✅ The correct answer is option B.
2590. Phenols are added in gasoline to
improve the octane number.
act as an antioxidant.
reduce its viscosity.
increase its pour point.
✅ The correct answer is option B.