They relay packets among networks that have different protocols (e.g. between a LAN and a WAN). They accept a packet formatted for one protocol and convert it to a packet formatted for another protocol before forwarding it. They operate in all seven layers of the OSI model.
Which is almost absent in crude petroleum? A. Olefins B. Mercaptans C. Naphthenes D. Cycloparaffins
Tetra-ethyl lead is added in gasoline to A. increase its smoke point. B. reduce gum formation. C. reduce the pour point. D. increase its octane number.
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
Flash point of diesel/kerosene (>50°C) is determined by the A. Abel apparatus B. Pensky-Martens apparatus C. Saybolt chromometer D. none of these
Aromatics are desired constituents of A. lubricating oil B. diesel C. kerosene D. petrol
Octane number (unleaded) of gasoline produced by isomerisation of butane may be about A. 45 B. 55 C. 70 D. 90
In a refinery petroleum crude is fractionated into gas fraction, light ends, intermediate distillates, heavy distillates, residues and by products. The group of products including gas oil, diesel oil and heavy fuel oil belongs to the fraction A. heavy distillates B. intermediate distillates C. light ends D. residues
Crude topping column operates at __________ pressure. A. atmospheric B. 10 atm C. vacuum D. 3 atm.
Pick out the correct statement pertaining to catalytic cracking. A. With increase in the reactor pressure, octane number of gasoline decreases. B. With increase in the reactor temperature, gasoline yield decreases for a given conversion. C. Percentage conversion increases with increase in the catalyst to oil ratio. D. all (a), (b) and (c)
Feedstock for polymerisation is A. naphtha. B. cracked gases rich in C2 & C4 olefins. C. low boiling aromatics. D. none of these.
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