Also called a re-generator, it is an electronic device that operates only at physical layer. It receives the signal in the network before it becomes weak, regenerates the original bit pattern and puts the refreshed copy back in to the link.
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.
Smoke point of a good burning kerosene may be around __________ mm. A. 0-5 B. 20-25 C. 60-75 D. 100-120
Quinoline is a/an __________ compound. A. sulphur B. nitrogen C. oxygen D. none of these
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