2871. Which of the following petrographic constituents of coal is non-coking?
Vitrain
Clarain
Durain
Fussain
✅ The correct answer is option D.
Chemical Engineering
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2872. Desirable “Micum Index” values of metal-lurical coke are
M40 > 78% and M10 < 10%
M40 > 4% and M10 < 80%
M40 > 10% and M10 < 78%
M40 > 98% and M10 < 2%
✅ The correct answer is option A.
2873. In sweetening process, solutizer agent used with caustic alkali is
potassium isobutyrate
sodium plumbite
methanol
phenol
✅ The correct answer is option A.
2874. The characterisation factor of a crude oil is calculated as 12.5. It means that; it is
paraffinic
naphthenic
intermediate
none of these
✅ The correct answer is option A.
2875. Alkylation
causes olefins to combine with each other.
causes olefins to combine with iso-paraffins.
converts iso-paraffin into olefin.
converts olefin into paraffin.
✅ The correct answer is option B.
2876. Reid vapour pressure of gasoline is the measure of its
pour point
cloud point
vapour locking tendency
carbon residue
✅ The correct answer is option C.
2877. A typical yield of diesel in straight run distillation of crude oil may be about __________ percent.
8
18
28
35
✅ The correct answer is option A.
2878. Pick out the correct statement pertaining to catalytic cracking.
With increase in the reactor pressure, octane number of gasoline decreases.
With increase in the reactor temperature, gasoline yield decreases for a given conversion.
Percentage conversion increases with increase in the catalyst to oil ratio.
all (a), (b) and (c).
✅ The correct answer is option D.
2879. Isomerisation converts the __________ tot-paraffins.
paraffins
olefins
naphthenes
none of these
✅ The correct answer is option A.
2880. Concentration of H2SO4 catalyst in alkyla-tion is kept between 90-98%, because H2SO4 having concentration
less than 90% promotes polymerisation.
more than 98% promotes cracking.
both (a) and (b).
neither (a) nor (b).
✅ The correct answer is option C.