Physical layer coordinates the functions required to transmit a bit stream over a physical medium.
☛ Physical characteristics of interfaces and media
☛ Representation of bits
☛ Data rate
☛ Synchronization of bits
☛ Line configuration
☛ Physical topology
☛ Transmission mode
Stabilisation of gasoline (petrol) means A. removal of dissolved gases from it. B. increasing its oxidation stability. C. improving its lead susceptibility. D. increasing its vapour pressure.
In petroleum refining, the process used for conversion of hydrocarbons to aromatics is A. catalytic cracking B. catalytic reforming C. hydrotreating D. alkylation
The main use of heavy gas oil produced by the vacuum distillation unit is as a A. blending component for kerosene. B. blending component for petrol. C. feedstock for fluid catalytic cracking unit. D. none of these.
Complete removal of __________ from gasoline is done by Unisol process using caustic soda and methyl alcohol. A. waxes B. mercaptans C. asphalt D. diolefins
A good lubricant should have high A. viscosity index B. volatility C. pour point D. none of these
Crude oil is pumped by a __________ pump. A. gear B. centrifugal C. screw D. reciprocating
Operating condition in the electrical dehydrators for crude oil is about A. 6.5 kgf/Cm2 & 95°C. B. 1 atm. & 110 °C. C. 20 kgf/cm2 & 110°C. D. 50 atm. and 150°C.
Solvent used in the deasphalting process is A. furfurol B. phenol C. propane D. hexane
Visbreaking process is used mainly for making A. high cetane diesel B. high octane gasoline C. fuel oil D. smoke free kerosene
Viscosity index of a lubricating oil A. is the measure of its flash point. B. is the measure of variation of viscosity with temperature. C. should be low. D. none of these.
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