⟩ What are the layers of OSI?
☛ Physical Layer
☛ Data Link Layer
☛ Network Layer
☛ Transport Layer
☛ Session Layer
☛ Presentation Layer
☛ Application Layer
☛ Physical Layer
☛ Data Link Layer
☛ Network Layer
☛ Transport Layer
☛ Session Layer
☛ Presentation Layer
☛ Application Layer
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.
Smoke point of a test sample of kerosene is found to be 15 mm. On removal of __________ from it, the smoke point rises to 25 mm. A. n-paraffins B. olefins C. aromatics D. none of these
__________ is not an important refinery process for upgrading the quality of lubricating oil. A. Deoiling B. Solvent refinning C. Clay treatment D. Hydrotreatment
Pick out the undesirable property for a solvent meant for dewaxing of lube oil. A. Complete miscibility with oil. B. High solubility of wax in the solvent. C. Both (a) and (b). D. Neither (a) nor (b).