0% 1 Chemical Engineering Basics Quiz 6 1 / 50 Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by ______ have residual stresses ? Forging Casting Cold rolling Hot rolling 2 / 50 High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27?C with relative humidity ranging from ________ percent ? 75 to 80 45 to 50 5 to 10 15 to 25 3 / 50 Identify the correct statement with reference to the extractive metallurgy of aluminium ? Sodium is deposited along with aluminium, but is immediately vaporised The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 Anode effect sets in when the cryolite concentration goes below 40%. Approximately 80% of the aluminium deposited on the cathode comes from cryolite 4 / 50 If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a ______ reactor? Breeder Fertile Heterogeneous Critical 5 / 50 In Newton?s law of viscosity, which states that the shear stress is proportional to the ______ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient) ? 1/V2 Vg 1/Vg V2 6 / 50 In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will ________? Decrease gradually Increase gradually Remain constant Increase rapidly 7 / 50 In a furnace with heating element temperature at 1700?C, the dominant mechanism of heat transfer will be___________? Natural convection Forced convection Conduction Radiation 8 / 50 Hooke?s law_________? None of these States that stress is inversely proportional to strain upto elastic limit Applies to elastic deformation Applies beyond limit of proportionality in stress-strain curve 9 / 50 Highest cutting speed is achieved by the ________ tool material ? Cast alloy Plain carbon steel Carbide High speed steel 10 / 50 Hot extrusion of aluminium is done in the temperature range of _________ ?C ? 450-500 350-400 550-600 250-300 11 / 50 In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that ? Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller Condenser can act as a storage unit for condensed steam Maintaining vacuum on tube side is more difficult than that on the shell side 12 / 50 If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity__________? Decreases by a factor of 1/3 Decreases by a factor of 3 Remains unchanged Is trebled 13 / 50 Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ? Galvanising None of these Tinning Sherardizing 14 / 50 Heat transfer by _______ is almost absent in case of fluidised bed drying operation? Both B. & C. Conduction Convection Radiation 15 / 50 In extrusion of metals, which of the following statement is true ? Relative motion between the billet surface and the container wall is always present Speed of the extruded material is same as that of ram speed Hollow ram is used for indirect extrusion Redundant work is a function of the die angle 16 / 50 If a solid is compressed adiabatically in its elastic range, its ______ remains constant ? Internal energy Temperature Enthalpy Entropy 17 / 50 In a neutral solution___________? None of these OH- ions are absent H+ ions are absent Both H+ and OH- ions are present in very small but equal concentration 18 / 50 If Reynolds number is greater than 1, then the_______? Inertia force is larger than the surface tension force Inertia force is larger than the gravitational force Viscous force is larger than the inertia force Inertia force is larger than the viscous force 19 / 50 In case of simple harmonic motion, displacement is proportional to the__________? Acceleration Neither A. nor B. Both A. & B. Velocity 20 / 50 In the Bayer?s process, bauxite is digested under pressure using _____? H2SO4 HCl NH3 NaOH 21 / 50 In inventory control theory, the economic order quantity (EOQ) is the______? Average level of inventory Optimum lot size None of these Lot size corresponding to break even analysis 22 / 50 In a good rimming steel___________? Silicon should be low but carbon should be high Both silicon & carbon should be high Carbon and silicon should be low Silicon should be high but carbon should be low 23 / 50 In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is___________? Equal Less More Much more 24 / 50 In chemical dehumidification of air_____? Both specific humidity & dry bulb temperature increases Specific humidity increases & dry bulb temperature decreases Specific humidity decreases & dry bulb temperature increases Both specific humidity & dry bulb temperature decreases 25 / 50 In a totally irreversible isothermal expansion process for an ideal gas, ?E = 0, ?H = 0. Then ?Q and ?S will be________? ?Q = 0, ?S=0 ?Q = 0, ?S = -ve ?Q = 0, ?S = +ve ?Q = +ve, ?S= +ve 26 / 50 In connection with corrosion of metals, passivation is the process that___________? Changes the composition of the metal None of these Intensifies deterioration Inhibits further deterioration 27 / 50 Heating of ferromagnetic materials to a temperature above Curie temperature makes it __________? Insulator for heat & electricity transmission Ferritic Behave like paramagnetic materials Superconductor 28 / 50 In ?Imperial Smelting Process? for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following _________? Rain of molten lead Blast of air Mixture of water and air Jet of water at high pressure 29 / 50 In practice, the compression ratio of compression-ignition (CI) engine ranges from ________? 5 to 10 60 to 70 15 to 25 40 to 55 30 / 50 Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by__________? Radiation Conduction Convection Both A. & B. 31 / 50 In case of a, centrifugal pump, the ratio h1/h2 is termed as the ______ efficiency (where, h1 = actual measured head & h2 = head imparted to the fluid by impeller)? Overall Mechanical Volumetric Impeller 32 / 50 Hydrogen in liquid steels is dissolved__________? In the ionic form In the molecular form In the atomic form As tiny gas bubbles 33 / 50 In the blast furnace, incorporation of water vapour in the blast gives the following effect ? Increases the hydrogen content in the metal No significant change occurs Increases the flame temperature Increases the reducing potential of the gas 34 / 50 In case of water (Prandtl number ? 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is ? More Less Unpredictable Equal 35 / 50 In the acid Bessemer process, the hot metal should have the following composition ? S 1.5% S < 0.05% and P < 0.05% S < 0.05% and P < 1.5% S > 1.5% and P < 0.05% 36 / 50 Hydro-cyclone is a______? Crusher wet classifier Dry classifier Magnetic separator 37 / 50 In _________ process, there is an increase in entropy with no degradation of energy ? Polytropic expansion Isochoric heat addition Isothermal expansion Isobaric heat addition 38 / 50 Heating the Hypo-eutectoid steels to 30?C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_________? Hardening Annealing Normalising Tempering 39 / 50 In a forced draft cooling tower, water is cooled from 95 to 80?F by exposure to air with a wet bulb temperature of 70?F. In this case, the_________? Both A. & B. Range is 15?F Neither A. nor B. Approach is 10?F 40 / 50 In the diving apparatus, helium is used along with oxygen, because it is ______? Lighter than nitrogen Completely miscible with oxygen Not soluble in blood at high pressure Easily available 41 / 50 High endurance limit of carburised machine parts is because of the fact that carburisation ___________? Enhances the yield point of the material Suppresses any stress concentration produced in the parts Introduces a compressive layer on the surface Produces a better surface finish 42 / 50 Hot & cold working of material causes its ________ deformation? Isotropic Elastic Visco-elastic Plastic 43 / 50 Hot working of lead is carried out at _____? 75?C Room temperature 373?K 150?C 44 / 50 In electrical resistance welding, distortion results from the use of improper_________? Electrodes Current Clamping methods Filler material 45 / 50 High speed steel tools retain their hardness upto a temperature of ___________ ?C? 500 1100 900 750 46 / 50 If the head is doubled in & centrifugal pump, the power required will increase in the ratio of___________? 21/3 25/2 23/2 23 47 / 50 In case of brasses, with decreasing zinc percentage and increasing copper percentage, its ______ increases ? Brinell hardness All A, B & C Percentage elongation Tensile strength 48 / 50 In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of__________? High speed steel Mild steel High carbon steel Stainless steel 49 / 50 In multipass welds, shot peening is done after each pass to___________? Close the surface porosity Flatten the weldment Break the continuity of columnar grains Introduce texture in the weld 50 / 50 Identify the false statement? Stress corrosion cracking is facilitated by tensile stress Pitting corrosion is usually very localised Hydrogen embrittlement is facilitated by tensile stress Martensitic steels are less susceptible to pitting corrosion than austenitic steels Provide Your Information Your score is The average score is 8% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevChemical Engineering Basics Quiz 5 Chemical Engineering Basics Quiz 7Next
