One of the main causes of congestion is that traffic is often busy. If hosts could be made to transmit at a uniform rate, congestion would be less common. Another open loop method to help manage congestion is forcing the packet to be transmitted at a more predictable rate. This is called traffic shaping.
Glycol added to petrol acts as a/an __________ agent. A. anti-knocking B. anti-icing C. anti-gum forming D. dewaxing
Though increased pressure has a retarding effect on cracking reaction, yet in actual process, a positive pressure of 10-15 kgf/cm2 is maintained during cracking mainly to A. increase the yield of light distillates. B. suppress coke formation. C. enhance the octane number of gasoline. D. reduce gum content in gasoline.
Pick out the wrong statement. A. Higher specific gravity of petroleum products means higher C/H ratio. B. Aromatics have lower specific gravity than corresponding paraffins. C. Hydrocarbons of low specific gravity (e.g, paraffins) possess the maximum thermal energy per unit volume. D. Hydrocarbons of high specific gravity (eg, aromatics) possess the maximum thermal energy per unit weight.
Octane number of gasoline produced by two stage fluidised catalytic cracking process is A. 80 B. 87 C. 92 D. 97
The proper arrangement of the petroleum fractions in order of their boiling points is A. lubricating oil > diesel > petrol > LPG B. lubricating oil > petrol > diesel > LPG C. petrol > lubricating oil > diesel > LPG D. petrol > diesel > LPG > lubricating oil
Pick out the wrong statement. A. Iso-paraffin crack faster than n-paraf-fin. B. Catalytic cracking is endothermic, but the regeneration of catalyst is exothermic. C. Rate of decomposition of olefins in catalytic cracking is slightly slower than the thermal cracking. D. None of these.
Feedstock for the production of biodiesel is A. herbal plants B. used vegetable oils C. LSHS D. bagasse
Which one is used to determine the colour of petroleum products? A. Colour comparator B. Saybolt chromometer C. Cleveland apparatus D. None of these
Catalytic cracking compared to thermal cracking of residue of vacuum distillation of crude oil A. gives higher yield of petrol. B. lower octane number of petrol. C. higher sulphur content in the product. D. higher gum forming material in petrol.
Phenols are added in gasoline to A. improve the octane number. B. act as an antioxidant. C. reduce its viscosity. D. increase its pour point.
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