Description : Visbreaking (A) Uses natural gas as feed (B) Is carried out at atmospheric pressure (C) Produces fuel oil of lower viscosity (D) Produces gasoline only
Last Answer : (C) Produces fuel oil of lower viscosity
Description : During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as (A) It is very corrosive at elevated temperature (B) Its viscosity is not reduced on ... be further reduced) (C) It decomposes on further increasing the temperature (D) None of these
Last Answer : (B) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
Description : Low viscosity absorbent is preferred for reasons of (A) Rapid absorption rates and good heat transfer characteristics (B) Improved flooding characteristics (C) Low pressure drop on pumping (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : For gas absorption, low viscosity solvents are preferred, because of their (A) Better flow characteristics (B) Low pumping pressure drop (C) Rapid absorption rates (D) All (A), (B) and (C)
Description : Phenols are added in gasoline to (A) Improve the octane number (B) Act as an antioxidant (C) Reduce its viscosity (D) Increase its pour point
Last Answer : (B) Act as an antioxidant
Description : Presence of predominantly large quantity of aromatics (polynuclear) is not desirable in aviation fuel, because it has (A) High pour point and low smoke point (B) Low viscosity index (C) High self-ignition temperature (D) All (A), (B) and (C)
Last Answer : (B) Low viscosity index
Description : Visbreaking process is used mainly for making (A) High cetane diesel (B) High octane gasoline (C) Fuel oil (D) Smoke free kerosene
Last Answer : (C) Fuel oil
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 : A good lubricant should have high (A) Viscosity index (B) Volatility (C) Pour point (D) None of these
Last Answer : (A) Viscosity index
Description : Pitch (a product of coal tar distillation) is always mixed with creosote oil, when it is to be burnt in a burner, because (A) Its calorific value is very less (B) Tar neutralises the residual acids ... for its transportation through pipelines at economic pressure drop (D) All (A), (B) and (C)
Last Answer : (C) It reduces viscosity and imparts fluidity for its transportation through pipelines at economic pressure drop
Description : Removal of light fractions from crude oil is called its (A) Sweetening (B) Dehydration (C) Stabilisation (D) Visbreaking
Last Answer : (C) Stabilisation
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 : Which of the following processes in oil refinery does not employ ‘cracking’? (A) Coking (B) Visbreaking (C) Pyrolysis (D) None of these
Last Answer : (D) None of these
Description : Multistage operation (as in the case of catalytic oxidation of SO2 ) is not carried out for NH3 synthesis, because of (A) Comparatively higher pressure drop (B) High cost of the high pressure ... for the reactor (C) Higher pumping cost (D) Chances of entrainment and disturbance of catalyst bed
Last Answer : (B) High cost of the high pressure vessel used for the reactor
Description : Crude oil is subjected to vacuum distillation in the last stage, because (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose (B) Lighter/low ... prone to thermal decomposition (C) High purity products can be obtained thereby (D) None of these
Last Answer : (A) High boiling point products like heavy fuel oil & lubricating oils are heat sensitive and may decompose
Description : Explain the following properties i) Pour point ii) Viscosity iii) Ignition quality iv) Fire point
Last Answer : i. Pour point: Pour point is the temperature below which the entire mass of fuel, solid or liquid together, freeze and thus cause flow of fuel impossible. Pour point is usually 5 to 10 °C below ... is the temperature at which the flash will sustain itself as a steady flame for at least five seconds.
Description : Tetra-ethyl lead is added in gasoline to (A) Increase its smoke point (B) Reduce gum formation (C) Reduce the pour point (D) Increase its octane numbe
Last Answer : (D) Increase its octane numbe
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 : Which of the following is not an important property of fuel oil/furnace oil? (A) Sulphur content (B) Viscosity (C) Aniline point (D) Flash point
Last Answer : (C) Aniline point
Description : Which of the following is the most important property for a jet fuel? (A) Cloud point (B) Pour point (C) Colour (D) Freezing point
Last Answer : (D) Freezing point
Description : Pick out the wrong statement. (A) Higher temperature is employed in visbreaking than in thermal cracking (B) Pyrolysis is a mild thermal cracking process (C) Lead susceptibility of ... Operating pressure and temperature in thermal cracking process is more than that in catalytic cracking process
Last Answer : (A) Higher temperature is employed in visbreaking than in thermal cracking (B) Pyrolysis is a mild thermal cracking process
Description : Optimum economic pipe diameter for fluid is determined by the (A) Viscosity of the fluid (B) Density of the fluid (C) Total cost considerations (pumping cost plus fixed cost of the pipe) (D) None of these
Last Answer : (C) Total cost considerations (pumping cost plus fixed cost of the pipe)
Description : Pour point of a petrofuel is (A) Multiple of 3°F (B) Multiple of 5°F (C) 5°C below the temperature at which oil ceases to flow (D) None of these
Last Answer : (C) 5°C below the temperature at which oil ceases to flow
Description : he temperature at which solid content of fuel freeze out is called.... (a) Fire point (b) Flash point (c) Pour point (d) Cloud point
Last Answer : (a) Fire point
Description : The temperature at which fuel flows to case is called.... (a) Fire point (b) Flash point (c) Pour point (d) Cloud point
Last Answer : c) Pour point
Description : LSHS is a type of furnace oil, which (A) Is more viscous than high viscosity furnace oil (HVFO) (B) Stands for low sulphur heavy stock (C) Is an ideal fuel for metallurgical furnaces due to its lower sulphur content (< 1%) (D) All (A), (B) and (C)
Description : Correct viscosity of furnace oil at the burner tip for proper atomisation is about 25 centistokes. To reduce the viscosity of high viscosity furnace oil (250 centistokes) to the correct atomisation viscosity (i.e. 25 cst), it should be preheated to about ___________°C. (A) 70 (B) 85 (C) 105 (D) 145
Last Answer : (C) 105
Description : Which of the following has the highest viscosity of all (at a given temperature)? (A) Naphtha (B) Fuel oil (C) Light diesel oil (D) Petrol
Last Answer : (B) Fuel oil
Description : Maximum viscosity of tar/PCM/fuel oil for easy and efficient atomisation in conventional burner is __________ centistokes (or 100 Redwood I seconds). (A) 5 (B) 25 (C) 50 (D) 100
Last Answer : (B) 25
Description : A small drop of oil spreads over water because : (1) oil has a higher surface tension (2) water has a higher surface tension (3) oil has a higher viscosity (4) water has a higher viscosity
Last Answer : (2) water has a higher surface tension Explanation: Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
Last Answer : water has a higher surface tension
Description : Reid vapour pressure of gasoline is the measure of its (A) Pour point (B) Cloud point (C) Vapour locking tendency (D) Carbon residue
Last Answer : (C) Vapour locking tendency
Description : Which temperature for a lubricating oil will be lowest ? (A) Flash point (B) Fire point (C) Pour point (D) Boiling
Last Answer : Ans: C
Description : In continuous filtration (at a constant pressure drop), filtrate flow rate varies inversely as the (A) Square root of the velocity (B) Square of the viscosity (C) Filtration time only (D) Washing time only
Last Answer : (A) Square root of the velocity
Description : Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the (A) Packing may be crushed due to thermal expansion/contraction of the ... C) Viscosity variation of the fluids may cause channelling/flooding (D) None of these
Last Answer : (A) Packing may be crushed due to thermal expansion/contraction of the components of the equipments
Description : Shell side pressure drop in a shell and tube heat exchanger does not depend upon the (A) Baffle spacing & shell diameter (B) Tube diameter & pitch (C) Viscosity, density & mass velocity of shell side fluid (D) None of these
Description : A gas (density = 1.5 kg/m3 , viscosity = 2 10 -5 kg/m.s) flowing through a packed bed (particle size = 0.5 cm, porosity = 0.5) at a superficial velocity of 2 m/s causes a pressure drop of 8400 Pa/m. The ... flowing at 3 m/s will be (A) 8400 Pa/m (B) 12600 Pa/m (C) 18900 Pa/m (D) 16800 Pa/m
Last Answer : (B) 12600 Pa/m
Description : Reynolds number for water flow through a tube of I.D. 5 cm is 1500. If a liquid of 5 centipoise viscosity and 0.8 specific gravity flows in the same pipe at the same velocity, then the pressure drop will (A) Increase (B) Decrease (C) Remain same (D) Data insufficient to predict pressure drop
Last Answer : (A) Increase
Description : For the same terminal conditions and valve size, the pressure drop in a fully opened globe valve as compared to that in a gate valve is (A) More (B) Less (C) Equal (D) Either (A) or (B); depends on the viscosity of the fluid
Last Answer : (A) More
Description : For laminar flow of Newtonian fluids through a circular pipe, for a given pressure drop and length & diameter of pipe, the velocity of fluid is proportional to (where, μ = fluid viscosity ) (A) μ (B) 1/μ (C) √μ (D) 1/√μ
Last Answer : (B) 1/μ
Description : Discharge in laminar flow through a pipe varies (A) As the square of the radius (B) Inversely as the pressure drop (C) Inversely as the viscosity (D) As the square of the diameter
Last Answer : (A) As the square of the radius
Description : In laminar flow through a round tube, the discharge varies (A) Linearly as the viscosity (B) Inversely as the pressure drop (C) Inversely as the viscosity (D) As the square of the radius
Last Answer : (C) Inversely as the viscosity
Description : Two fluids are flowing through two similar pipes of the same diameter. The Reynold's number is same. For the same flow rate if the viscosity of a fluid is reduced to half the value of the ... (A) Increase (B) Decrease (C) Remain unchanged (D) Data insufficient to predict relative pressure drop
Last Answer : (B) Decrease
Description : Bag filter design is predominantly dependent on gas temperature, as it affects the gas density & viscosity and the selection of filtering material. The pressure drop in a bag filter is (A) Inversely proportional to ... the gas (C) Proportional to the pressure of the gas (D) Both (B) and (C)
Last Answer : (D) Both (B) and (C)
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 : Petroleum coke is commercially produced by the __________ process. (A) Hydrocracking (B) Visbreaking (C) Fluid catalytic cracking (D) Delayed coking
Last Answer : (D) Delayed coking
Description : Which of the following processes consumes hydrogen? (A) Fluid catalytic cracking (B) Visbreaking (C) Propane deasphalting (D) None of these
Last Answer : (A) Fluid catalytic cracking
Description : Which of the following processes is used for the production of petroleum coke? (A) Stabilisation (B) Visbreaking (C) Cracking (D) Reforming
Last Answer : (C) Cracking
Description : Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher (A) Melting point, hence can be subjected to higher temperature (B) Density; hence core volume for a given ... be smaller (C) Resistance to effects of irradiation (D) All (A), (B) and (C)
Description : Cetane number of a diesel fuel is the measure of its (A) Ignition delay (B) Smoke point (C) Viscosity (D) Oxidation stability
Last Answer : (A) Ignition delay