The Data Link Layer transforms the physical layer, a raw transmission facility, to a reliable link and is responsible for node-node delivery.
☛ Framing
☛ Physical Addressing
☛ Flow Control
☛ Error Control
☛ Access Control
Which is the most undesirable component in kerosene? A. Aromatics B. i-paraffins C. n-paraffins D. Naphthenes
Hydrogen percentage (by weight) in crude petroleum may be about A. 5 B. 15 C. 25 D. 35
Which of the following constituents present in petroleum is responsible for ash formation? A. Nitrogen compounds B. Organometallic compounds C. Sulphur compounds D. Oxygen compounds
The coking process normally mostly used in Indian oil refineries is the __________ coking process. A. delayed B. flexi C. fluid D. contact
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
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