A technique called piggybacking is used to improve the efficiency of the bidirectional protocols. When a frame is carrying data from A to B, it can also carry control information about arrived (or lost) frames from B; when a frame is carrying data from B to A, it can also carry control information about the arrived (or lost) frames from A.
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
Catalytic desulphurisation process used for sweetening of straight run gasoline and kerosene uses __________ as catalyst. A. bauxite B. fuller's earth C. activated clay D. all (a), (b) & (c)
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.
Flash point of motor gasoline may be around __________ °C. A. 10 B. 45 C. 100 D. 150
__________ test is done to find out the softening point of bitumen. A. Impact B. Ball and ring C. Flame D. Viscosity
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)
Furfural solvent extraction is used for upgrading (by dissolving aromatics) A. naphtha B. lubricating oils C. wax D. cracking feedstock
Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint. A. black B. white C. red D. yellow
Which of the following has the lowest viscosity (at a given temperature) of all? A. Naphtha B. Kerosene C. Diesel D. Lube oil
Solution used in Doctor's treatment for the removal of mercaptans is A. sodium hydroxide B. sodium plumbite C. cupric chloride D. potassium isobutyrate
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