Description : . __________ is not an important refinery process for upgrading the quality of lubricating oil. (A) Deoiling (B) Solvent refining (C) Clay treatment (D) Hydro-treatment
Last Answer : (A) Deoiling
Description : 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
Last Answer : (B) Is the measure of variation of viscosity with temperature
Description : . Pick out the wrong statement. (A) Multigrade lubricating oils have high viscosity index (B) Paraffinic oil has very high viscosity index (C) Naphthenic oil has very low viscosity index (D) High viscosity index means a large change in viscosity with change in temperature
Last Answer : (D) High viscosity index means a large change in viscosity with change in temperature
Description : A multigrade lubricating oil means an oil having high (A) Viscosity index (B) Viscosity (C) Aniline point (D) Flash point
Last Answer : (A) Viscosity index
Description : Paraffins are desirable in lubricating oil, as it has got high (A) Viscosity (B) Viscosity index (C) Smoke point (D) Pour poin
Last Answer : (C) Smoke point
Description : Higher viscosity index of a lubricating oil denotes (A) Less changes in fluidity of oil with temperature (B) Substantially high change in fluidity of oil with temperature (C) Its unsuitability under varying temperature conditions (D) None of these
Last Answer : (A) Less changes in fluidity of oil with temperature
Description : Furfural solvent extraction is used for upgrading (by dissolving aromatics) (A) Naphtha (B) Lubricating oils (C) Wax (D) Cracking feedstock
Last Answer : (B) Lubricating oils
Description : Deoiling is the process of removal of oil from wax. It is done by the __________ process. (A) Solvent extraction (B) Sweating (C) Resettling (D) All (A), (B) & (C)
Last Answer : (D) All (A), (B) & (C)
Description : Medium viscosity lubricating oil can be most ideally pumped by a __________ pump. (A) Vane (B) Piston (C) Centrifugal (D) Plunger
Last Answer : (A) Vane
Description : Higher viscosity of lubricating oil usually signifies (A) Lower Reid vapour pressure (B) Higher acid number (C) Higher flash point and fire point (D) Lower flash point and fire point
Last Answer : (C) Higher flash point and fire point
Description : Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when (A) Extracting solvent is cheaply & abundantly available ... very high (D) One of the liquid components has very high affinity towards the solvent
Last Answer : (D) One of the liquid components has very high affinity towards the solvent
Description : Oil produced by solvent extraction (A) Has low free fatty acid content (B) Is odourless (C) Both (A) & (B) (D) Neither (A) nor (B)
Last Answer : (D) Neither (A) nor (B)
Description : Penetration test determines the __________ of the grease. (A) Stiffness (B) Lubricating properties (e.g. oilness) (C) Service temperature (D) Variation in viscosity with temperature
Last Answer : (A) Stiffness
Description : Hydrofining is the most recent and effective method for the (A) Removal of sulphur (B) Improvement of smoke point (C) Reduction of breathing loss (D) Improvement of viscosity index
Last Answer : (A) Removal of sulphur
Description : As compared with oil with VI=80, a lubricating oil with VI=90 (A) Has more viscosity (B) Has less viscosity (C) Has more rate of change of viscosity with respect to temperature (D) Has less rate of change of viscosity with respect to temperature
Last Answer : (D) Has less rate of change of viscosity with respect to temperature
Description : Explain the selection of lubricating oil on the basis of viscosity and service rating.
Last Answer : Selection of Lubricating Oil: 1. On the basis of Viscosity : Lubricating Oils Classify in terms of Viscosity at -180C or in cold climates. a) SAE 5W b) SAE 10W c) SAE ... stability & anti- scuff Protection c) SC, SD & SC: Meets automotive manufactures specifications.
Description : Classify lubricating oil using viscosity (SAE) and load severity (API) rating.
Last Answer : 1.On the basis of Viscosity : i. Lubricating Oils Classify in terms of Viscosity at -18 0C or in cold climates. a) SAE 5W b) SAE 10W c) SAE 20 W ii. Lubricating Oils Classify ... sum oxidation stability & anti- scuff c. protection d. SC, SD & SE: Meets automotive manufactures specifications.
Description : Solvent used in duo-sol extraction for lube oil upgradation is a mixture of (A) Propane & phenol-cresol mixture (B) Methyl ethyl ketone & glycol (C) Phenol & furfural (D) Propane & liquid sulphur dioxide
Last Answer : (A) Propane & phenol-cresol mixture
Description : Pick out the wrong statement pertaining to solvent extraction of oil. Rate of extraction (A) Decreases with decrease of thickness of the flakes (B) Increases with the increasing flake size ... considerably with the rise of temperature (D) Decreases as the moisture content of flakes increases
Last Answer : (D) Decreases as the moisture content of flakes increases
Description : Solvent used for extraction of oil is (A) Hexane (B) Methyl ethyl ketone (C) Furfural (D) None of these
Last Answer : (A) Hexane
Description : Deoiling of wax is done by its (A) Heating (B) Cooling (C) Solvent extraction (D) Both (B) & (C
Last Answer : (D) Both (B) & (C
Description : Separation of the isotopes of helium for scientific investigations is done by (A) Reverse osmosis (B) Thermal diffusion (C) Leaching (D) Solvent extraction
Last Answer : (B) Thermal diffusion
Description : The solvent used in liquid-liquid extraction should have __________ less than one. (A) Selectivity (B) Distribution co-efficient (C) Both (A) and (B) (D) Neither (A) nor (B)
Description : Acetic acid will be most economically separated from a dilute solution of acetic acid in water by (A) Solvent extraction (B) Continuous distillation (C) Evaporation (D) Absorption
Last Answer : (A) Solvent extraction
Description : The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag. (A) Fluidity (B) Basicity (C) Acidity (D) Viscosity
Last Answer : Option A
Description : Which of the following plants does not emit appreciable amount of SO2 in atmosphere? (A) Thermal power plant (B) Petroleum refinery (C) Nitric acid plant (D) Sulphuric acid plant
Last Answer : (C) Nitric acid plant
Description : Sodium salt of higher molecular weight fatty acid is termed as the __________ soap. (A) Hard (B) Soft (C) Metallic (D) Lubricating
Last Answer : (B) Soft
Description : Which one is preferred for aircraft engine? (A) High viscosity index lube oil (B) Low viscosity index lube oil (C) High freezing point aviation fuel (D) None of these
Last Answer : (A) High viscosity index lube oil
Description : Paraffin base crude oil as compared to asphalt base crude gives (A) Higher yield of straight run gasoline (B) Higher octane number gasoline (C) Lower viscosity index lube oil (D) Poorer yield of lube oil
Last Answer : (A) Higher yield of straight run gasoline
Description : Pick out the wrong statement. (A) Pensky-Marten apparatus is used for determining flash points above 50°C (B) Characterisation factor of paraffinic crude oil is more than 12 (C) Abel ... An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Last Answer : (D) An oil having high susceptibility to change in viscosity with temperature changes, has a high viscosity index
Description : Electrometallurgical methods of metal extraction is normally used for those metals (A) Whose oxide/ore is not reduced by carbon (B) Which fall in the category of alkali & alkaline earth metals (C) Which stands higher in the electrochemical series of the metal (D) All (A), (B) & (C)
Description : Solvent used in the Udex (glycol) extraction process for removal of light aromatics from cracked naphtha is (A) Propane (B) Diethylene glycol (C) Aqueous solution (10% water) of diethylene glycol (D) Methyl ethyl ketone (MEK)
Last Answer : (C) Aqueous solution (10% water) of diethylene glycol
Description : The rate of solid-liquid extraction is limited by the (A) Phase change of the solute as it dissolves in the solvent (B) Diffusion of the solute through the solvent in the pores to the outside of the particle (C) ... contact with the particle to the main bulk of the solution (D) All 'a', 'b' & 'c'
Last Answer : (D) All 'a', 'b' & 'c'
Description : Pick out the wrong statement. (A) The operating line always lies above the equilibrium solubility curve in case of a single component absorber (B) The operating line always lies below the equilibrium ... (D) The solubility of a particular gas in ideal solution in any solvent is always the same
Last Answer : (C) The operating pressure in solvent extraction system should be below vapor pressures of all components
Description : Pick out the correct statement. (A) In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity (B) With increase in temperature, the selectivity of the solvent used ... in solvent extraction is unity at the plait point (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : Selectivity of the solvent used in solvent extraction should be (A) 1 (B) > 1 (C) < 1 (D) 0
Last Answer : (B) > 1
Description : In a liquid-liquid extraction, 10 kg of a solution containing 2 kg of solute C and 8 kg of solvent A is brought into contact with 10 kg of solvent B. Solvent A and B are completely immiscible in each other whereas ... (C) Less than 1 kg of C is transferred to B (D) No amount of C is transferred to B
Last Answer : (A) The entire amount of C is transferred to solvent B
Description : Degree of freedom for leaching and solvent extraction process is (A) 0 (B) 1 (C) 2 (D) 3
Last Answer : (D) 3
Description : In which of the following unit operations, the selectivity is an important parameter? (A) Distillation (B) Solvent extraction (C) Absorption (D) None of these
Last Answer : (B) Solvent extraction
Description : The solvent used in liquid extraction should not have high latent heat of vaporisation, because (A) The pressure drop and hence the pumping cost will be very high (B) It cannot ... by distillation may be prohibitively high (D) It will decompose while recovering by distillation
Last Answer : (C) Its recovery cost by distillation may be prohibitively high
Description : Compound A is extracted from a solution of A + B into a pure solvent S. A Co-current unit is used for the liquid-liquid extraction. The inlet rate of the solution containing A is 200 moles of B/hr.m2 and the ... extraction achieved in the unit is (A) 25% (B) 50% (C) 70% (D) 90%
Last Answer : (B) 50%
Description : Fractional solvent extraction (A) Employs only one solvent (B) Employs two solvents (C) Results in low interfacial tension (D) None of these
Last Answer : (B) Employs two solvents
Description : A binary mixture of benzene and cyclohexane is separated by (A) Flash vaporisation (B) Extractive distillation (C) Solvent extraction (D) Ordinary distillation
Last Answer : (B) Extractive distillation
Description : In liquid extraction, if the selectivity is unity, then (A) Separation of the constituents is the most effective (B) No separation will occur (C) Amount of solvent required will be minimum (D) Solvent flow rate should be very low
Last Answer : (B) No separation will occur
Description : Pick out the wrong statement. (A) In solvent extraction, the distribution co-efficient should be as large as possible for solvent economy (B) With increase in pressure, the solubility of ... in distillation column (D) The capacity of a distillation column is maximum at total reflux
Last Answer : (D) The capacity of a distillation column is maximum at total reflux
Description : Perforated plate towers are unique for solvent extraction because, they provide (A) Higher contact area (B) Better contact of the phase (C) Repeated coalescence & redispersion of the drop phase (D) None of these
Last Answer : (C) Repeated coalescence & redispersion of the drop phase
Description : The commonly used solvent in supercritical extraction is (A) Methyl ethyl ketone (B) Water (C) Carbon tetrachloride (D) Carbon dioxide
Last Answer : (D) Carbon dioxide
Description : In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate ... phase is (in Kg) (A) 6.89 (B) 8.89 (C) 10 (D) 8.25
Last Answer : (B) 8.89
Description : Essential oils are usually obtained using (A) Steam distillation (B) Extractive distillation (C) Solvent extraction (D) Leaching
Last Answer : (D) Leaching