0% 1 Chemical Engineering Basics Quiz 6 1 / 50 In a neutral solution___________? H+ ions are absent OH- ions are absent None of these Both H+ and OH- ions are present in very small but equal concentration 2 / 50 In practice, the compression ratio of compression-ignition (CI) engine ranges from ________? 40 to 55 5 to 10 60 to 70 15 to 25 3 / 50 If a solid is compressed adiabatically in its elastic range, its ______ remains constant ? Internal energy Temperature Enthalpy Entropy 4 / 50 In inventory control theory, the economic order quantity (EOQ) is the______? Optimum lot size Lot size corresponding to break even analysis Average level of inventory None of these 5 / 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___________? Much more More Less Equal 6 / 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_________? Tempering Normalising Annealing Hardening 7 / 50 In extrusion of metals, which of the following statement is true ? Speed of the extruded material is same as that of ram speed Relative motion between the billet surface and the container wall is always present Hollow ram is used for indirect extrusion Redundant work is a function of the die angle 8 / 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. 9 / 50 Hooke?s law_________? None of these Applies beyond limit of proportionality in stress-strain curve States that stress is inversely proportional to strain upto elastic limit Applies to elastic deformation 10 / 50 High speed steel tools retain their hardness upto a temperature of ___________ ?C? 750 1100 500 900 11 / 50 Heating of ferromagnetic materials to a temperature above Curie temperature makes it __________? Ferritic Insulator for heat & electricity transmission Superconductor Behave like paramagnetic materials 12 / 50 Identify the false statement? Martensitic steels are less susceptible to pitting corrosion than austenitic steels Stress corrosion cracking is facilitated by tensile stress Pitting corrosion is usually very localised Hydrogen embrittlement is facilitated by tensile stress 13 / 50 In case of simple harmonic motion, displacement is proportional to the__________? Velocity Neither A. nor B. Both A. & B. Acceleration 14 / 50 Hot working of lead is carried out at _____? 150?C 75?C Room temperature 373?K 15 / 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 ? Less Equal Unpredictable More 16 / 50 In chemical dehumidification of air_____? Specific humidity increases & dry bulb temperature decreases Both specific humidity & dry bulb temperature decreases Both specific humidity & dry bulb temperature increases Specific humidity decreases & dry bulb temperature increases 17 / 50 In multipass welds, shot peening is done after each pass to___________? Introduce texture in the weld Close the surface porosity Break the continuity of columnar grains Flatten the weldment 18 / 50 In the blast furnace, incorporation of water vapour in the blast gives the following effect ? Increases the flame temperature Increases the hydrogen content in the metal Increases the reducing potential of the gas No significant change occurs 19 / 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 Is trebled Remains unchanged Decreases by a factor of 3 20 / 50 Heat transfer by _______ is almost absent in case of fluidised bed drying operation? Conduction Both B. & C. Radiation Convection 21 / 50 In a drilling process, the metal is removed by both shearing & extrusion. General purpose drills are made of__________? Mild steel High carbon steel High speed steel Stainless steel 22 / 50 In a boundary layer developed along the flow, the pressure decreases in the downstream direction. The boundary layer thickness in this case will ________? Remain constant Increase gradually Decrease gradually Increase rapidly 23 / 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 ? 45 to 50 75 to 80 5 to 10 15 to 25 24 / 50 In electrical resistance welding, distortion results from the use of improper_________? Clamping methods Filler material Electrodes Current 25 / 50 High endurance limit of carburised machine parts is because of the fact that carburisation ___________? Suppresses any stress concentration produced in the parts Introduces a compressive layer on the surface Produces a better surface finish Enhances the yield point of the material 26 / 50 If Reynolds number is greater than 1, then the_______? Inertia force is larger than the gravitational force Inertia force is larger than the viscous force Viscous force is larger than the inertia force Inertia force is larger than the surface tension force 27 / 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 Hot rolling Cold rolling Casting 28 / 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 = +ve ?Q = 0, ?S=0 ?Q = +ve, ?S= +ve ?Q = 0, ?S = -ve 29 / 50 Hydro-cyclone is a______? wet classifier Dry classifier Crusher Magnetic separator 30 / 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 Impeller Mechanical Volumetric 31 / 50 In a good rimming steel___________? Silicon should be low but carbon should be high Silicon should be high but carbon should be low Both silicon & carbon should be high Carbon and silicon should be low 32 / 50 In _________ process, there is an increase in entropy with no degradation of energy ? Polytropic expansion Isochoric heat addition Isothermal expansion Isobaric heat addition 33 / 50 In the diving apparatus, helium is used along with oxygen, because it is ______? Easily available Lighter than nitrogen Not soluble in blood at high pressure Completely miscible with oxygen 34 / 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 ? Maintaining vacuum on tube side is more difficult than that on the shell side 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 Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam 35 / 50 Identify the correct statement with reference to the extractive metallurgy of aluminium ? Approximately 80% of the aluminium deposited on the cathode comes from cryolite The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3 Sodium is deposited along with aluminium, but is immediately vaporised Anode effect sets in when the cryolite concentration goes below 40%. 36 / 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 Tinning None of these Sherardizing 37 / 50 If the head is doubled in & centrifugal pump, the power required will increase in the ratio of___________? 25/2 23 21/3 23/2 38 / 50 In a furnace with heating element temperature at 1700?C, the dominant mechanism of heat transfer will be___________? Natural convection Conduction Forced convection Radiation 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_________? Range is 15?F Both A. & B. Neither A. nor B. Approach is 10?F 40 / 50 In case of brasses, with decreasing zinc percentage and increasing copper percentage, its ______ increases ? Percentage elongation Tensile strength Brinell hardness All A, B & C 41 / 50 In connection with corrosion of metals, passivation is the process that___________? Changes the composition of the metal Inhibits further deterioration None of these Intensifies deterioration 42 / 50 In the acid Bessemer process, the hot metal should have the following composition ? S < 0.05% and P < 0.05% S > 1.5% and P < 0.05% S 1.5% S < 0.05% and P < 1.5% 43 / 50 Hot extrusion of aluminium is done in the temperature range of _________ ?C ? 450-500 250-300 550-600 350-400 44 / 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 1/Vg V2 Vg 45 / 50 Hot & cold working of material causes its ________ deformation? Elastic Visco-elastic Plastic Isotropic 46 / 50 In the Bayer?s process, bauxite is digested under pressure using _____? H2SO4 NaOH HCl NH3 47 / 50 Highest cutting speed is achieved by the ________ tool material ? Carbide Plain carbon steel High speed steel Cast alloy 48 / 50 If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a ______ reactor? Heterogeneous Fertile Breeder Critical 49 / 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 _________? Blast of air Jet of water at high pressure Mixture of water and air Rain of molten lead 50 / 50 Hydrogen in liquid steels is dissolved__________? In the ionic form In the molecular form As tiny gas bubbles In the atomic form 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
