E-PolyLearning

1. A fuel oil consists of 4 fractions A, B, C and D. Their molar compositions and vapour pressures are given below. The vapour pressure of the fuel oil will be __________ mm Hg.
a. 736
b. 727.5
c. 512
d. 767.8
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Answer: (a).736

2. 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 (a), (b) and (c)
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Answer: (d).all (a), (b) and (c)

3. Paraffin base crude oil as compared to asphalt base crude gives
a. higher yield of straight run gasoline.
b. higher octane number gasoline.
c. lower viscosity index lube oil.
d. poorer yield of lube oil.
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Answer: (a).higher yield of straight run gasoline.

4. True boiling point apparatus is used for the
a. determination of characterisation factor.
b. evaluation of oil stocks.
c. determination of true vapour pressure.
d. none of these.
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Answer: (b).evaluation of oil stocks.

5. In the atmospheric pressure crude distillation, the content of __________ from lighter fraction to heavier ones.
a. sulphur increases
b. sulphur decreases
c. nitrogen decreases
d. none of these
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Answer: (a).sulphur increases

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