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Chemical Engineering Objective Questions { Petroleum Refinery Engineering }



239. Paraffins are desirable in lubricating oil, as it has got high
A. Viscosity
B. Viscosity index
C. Smoke point
D. Pour point
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240. Which of the following has the highest gum forming tendency in gosoline?
A. Paraffins
B. Diolefins
C. Aromatics
D. Naphthenes
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241. Specific gravity of a petroleum product gives an indication of its
A. Degree of refinement
B. Hydrocarbon content type (aromatic or paraffinic)
C. Ease of atomisation
D. Sulphur content
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242. Iso-octane is used as a reference substance in the definition of octane number and it is assigned an octane number value of 100. Iso-octance is chemically known as
A. α-methyl naphthalene
B. 2-2-4 tri methyl pentane
C. 1, 3 butadiene
D. Tetra methyl ethylene
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243. Mercaptans are
A. Low boiling sulphur compounds
B. Added in LPG cylinders to detect gas leakage by its smell
C. Undesirable in petrol, as they reduce its octane number
D. All of the above
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244. Pick out the wrong statement.
A. Lower boiling paraffins have higher octane number than higher paraffins
B. Dehydrogenation of naphthenes to aromatics is a desirable reaction in reforming process
C. The most ideal feedstock for thermal reforming is dearomatised kerosene
D. Catalyst used in catalytic reforming is platinum on silica-alumina base
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245. Which of the following is an additive used for improving the cetane number of diesel?
A. Tetraethyl lead
B. Tetramethyllead
C. Ethyl nitrate or acetone
D. None of these
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