Error control is both error detection and error correction. It allows the receiver to inform the sender of any frames lost or damaged in transmission and coordinates the re-transmission of those frames by the sender. In the data link layer, the term error control refers primarily to methods of error detection and re-transmission.
__________ is not an important refinery process for upgrading the quality of lubricating oil. A. Deoiling B. Solvent refinning C. Clay treatment D. Hydrotreatment
Pick out the undesirable property for a solvent meant for dewaxing of lube oil. A. Complete miscibility with oil. B. High solubility of wax in the solvent. C. Both (a) and (b). D. Neither (a) nor (b).
Which of the following is used as a catalyst in fluidised bed catalytic cracking? A. Silica-magnesia B. Silica-alumina C. Bentonite clays D. All (a), (b) and (c)
Casing head gasoline is the liquid A. butane. B. propane. C. natural gas. D. gasoline separated from wet natural gas by compression.
Most commonly used crude heater before the fractionation tower in a refinery is the __________ heater. A. electric immersion B. pipestill C. steam coil D. none of these
Pour point and freezing point is equal for A. petrol B. diesel C. water D. crude petroleum
Maximum sulphur percentage in low sulphur heavy stock (LSHS) furnace oil is about A. 0.1 B. 1 C. 2.5 D. 3.5
Which of the following fractions of a crude oil will have the maximum gravity API (i.e. °API)? A. Diesel B. Gasoline C. Atmospheric gas oil D. Vacuum gas oil
Flash point of an oil gives an idea of the A. nature of boiling point diagram of the system. B. amount of low boiling fraction present. C. explosion hazards. D. all (a), (b) and (c)
Illuminating characteristics of kerosene is expressed by its A. smoke point B. aniline point C. luminosity number D. aromatic content
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