0% 0 Chemical Engineering Basics Quiz 9 1 / 50 Production of one ton of paper in Indian paper industry consumes about _____ kWh of electricity ? 800 1400 2000 300 2 / 50 Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are ? Cobalt, chromium & tungsten Cobalt, chromium & nickel Molybdenum, tungsten & chromium Cobalt, zirconium & molybdenum 3 / 50 Pick out the correct statement about the condensation? Reynolds number of condensing liquid is based on its mass flow rate Suitable coating or vapour additive is used to promote film wise condensation If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it Filmwise condensation gives a lower heat transfer rate than the dropwise condensation 4 / 50 Pick out the wrong statement about the machinability of metals. Machinability of a metal ? Decreases with increases in tensile strength & decrease in grain size Depend on the composition, microstructure and physical & mechanical properties Decreases with increase in strain hardening tendencies Decreases with increase in hardness, in general 5 / 50 Percentage of differential pressure lost in a Venturimeter with a tapering of 15? may be about_____? 25 50 1 10 6 / 50 Pick out the wrong statement about nucleate boiling ? Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface The temperature is less than that of film boiling Surface temperature is greater than the saturation temperature of the liquid Heat transfer from the surface of the liquid is less than that in film boiling 7 / 50 Pick out the wrong statement? Brittle materials are generally tested in tension Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation Fatigue fracture of a material is always brittle in nature and takes place due to the existence of line imperfections Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly caused by the formation and coalescence of voids in the necked region 8 / 50 Pick out the wrong statement? Copper is the metal having the highest electronic conductivity Glass transition temperature applies to ?polymers? but not to ?glasses? Hardenability & Weldability of metals are inversely related Covalent bonding formed by sharing of electrons is present in all semi-conductor materials 9 / 50 Pick out the wrong statement ? For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire diameter) Crushing load or columns is less than the buckling load Modulus of resilience is proportional to (stress at elastic limit)2 The equivalent stiffness of two springs (of equal stiffness ?S?) in series is S/2 while in parallel is 2S 10 / 50 Quartz is a _________ material ? Ferroelectric Piezoelectric Ferromagnetic Diamagnetic 11 / 50 Projection welding & stud welding is categorised as the ________ welding? Pressure Arc Thermit Resistance 12 / 50 Photographic plates are coated with _______? Silver nitrate Silver halide Calcium silicate Metallic silver 13 / 50 Pick out the wrong statement about coating/electroplating of metals ? Phosphate coating is less corrosion resistant than chromate coating The base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode Phosphate coating is used as an excellent base for paints & enamels Calorising is the process of coating steel with chromium 14 / 50 Rankine cycle comprises of two isothermal and two _____ processes? Isobaric Isentropic Polytropic None of these 15 / 50 Reduction in the grain size reduces the __________ of the material? Tensile strength Creep resistance All A, B. & C Fatigue resistance 16 / 50 Pick out the wrong statement ? The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays Crystal structure of a material can be studied by an electron microscope The X-rays cannot be deflected by electric field unlike cathode rays The quality of X-rays can be controlled by varying the anode-cathode voltage 17 / 50 Pick out the correct combination about the role of various additives used in polymers ? Lubricants: increases the flexibility of polymers Heat stabiliser: increases the maximum service temperature Plasticiser: increases the polymer strength Fillers: Does not affect the property of polymer but increases its weight 18 / 50 Primary designation of steel is based on its___________? Iron content Hardness & tensile strength Carbon content Alloying elements content 19 / 50 Pick out the wrong statement ? Lead can creep under its own weight at room temperature The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement With increase in temperature, the electrical conductivity of intrinsic semi-conductor will Recrystallisation temperature decreases with decrease in strain in a cold worked metal 20 / 50 Production of a hollow product by inflation of a tube or parison is called the ________ process? Injection Calendaring Blow moulding Extrusion 21 / 50 Pick out the correct statement? Tempering of a material improves ductility & toughness but reduces hardness & brittleness Normalising of a material induces stresses Hot worked materials are subjected to annealing to remove internal stresses Annealing of steel hardens it slightly 22 / 50 Rain drops falling through atmospheric air attain limited terminal velocity, because of ______? Surface tension effects of water Viscous force exerted by air Upward thrust due to air Force of gravity 23 / 50 Potable water means the water used for______? Cooling Drinking Evaporation to produce steam Fire-fighting 24 / 50 Plasma is_______? A source of steady and highest controllable pressure A high temperature neutral gas Formed at very low temperature Nothing but ionised gas 25 / 50 Presence of nickel & chromium in steel does not raise its __________? Resilience Elastic limit Ductility Machining properties 26 / 50 Resistance of an electrical conductor is proportional to its (where, l = length and A = crosssectional area of the conductor)_________? Both A. & B. A l A2 27 / 50 Pick out the correct statement ? Rocket engines carry oxygen required for the combustion in the form of oxidiser Jet engine can work, where there is no atmosphere Jet engines also carry oxidiser Rocket engines cannot work, where there is no atmosphere 28 / 50 Pressure required to increase the density of water by about 1% is ______ atmosphere? 200 50 1000 10 29 / 50 Pick out the wrong statement ? A ferromagnetic material becomes paramagnetic above the ?Curie temperature? Tungsten steel and alnico are not hard magnetic materials Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces 30 / 50 Resilience of a bolt can be increased by increasing its ___________? None of these Shank diameter Length Head diameter 31 / 50 Powder metallurgy process does not make metal powder by___________? Hammering Electrolytic deposition Grinding/milling Atomisation 32 / 50 Property responsible for the talcum powder to cling to the skin is the___________? Surface tension Capillary action Cohesion Adhesion 33 / 50 Powder metallurgy is used to produce___________? Components of such alloys whose constituents do not form alloys readily High precision components with complex cavities and sharp features Components of large size Porosity free components 34 / 50 Recrystallisation temperature of steel is ________ ?C? 500 300 50 800 35 / 50 Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is___________? Black Yellow Silver grey Green 36 / 50 Percentage of argon (by volume) in dry atmospheric air is about_________? 0.57 0.3 0.09 0.94 37 / 50 Removal of non-condensable from steam or other vapour is termed as the _________ process? Condensation Exhaust Scavenging Deaeration 38 / 50 Powder metallurgy technique is used in the production of ______ tools ? High speed steel Drilling Tungsten carbide High carbon steel 39 / 50 Pick out the wrong statement? Stretch forming is a process of cold drawing Processing of thermoplastics is ideally done by compression moulding Mass production of seamless pipes are done by electrical resistance welding (ERW) Processing of thermosetting plastics is ideally done by injection moulding 40 / 50 Probability of cavitation occuring becomes very high, when the local ________ resulting ? Pressure becomes very high Temperature becomes low Pressure falls below the vapour pressure All A, B & C 41 / 50 Pick out the wrong conversion of absolute & kinematic viscosities ? 1 stoke = 1 cm2/sec 1 m2/sec = 104 stokes 1 stoke = 1 m2/sec 1 N.sec/m2 = 10 paise 42 / 50 Plants produce carbohydrates from the CO2 present in the atmosphere by__________? Photochemical reaction Polymerisation None of these Oxidation 43 / 50 Pick out the wrong statement ? Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyaniding, carburising, choiceno C nitriding etc., which produces high carbon outer layers resulting in increase of surface hardness Induction hardening and flame hardening techniques are also used for surface hardening Martempering of a material is a hardening process Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties 44 / 50 Preheating before welding is done to______? Make the plate softer Prevent cold cracks Burn oil & grease sticking to plate surfaces Avoid plate distortion 45 / 50 Regeneration of molecular sieve requires it to be heated to a temperature of about ___________ ?C? 1000-1100 600-800 200-300 80-120 46 / 50 Plastics as a material of construction suffer from the drawback of low__________? Strength Machinability Plastic deformation Density 47 / 50 Pick out the wrong statement? None of these In line and staff organisation, ?line? executes and ?staff directs Line organisation is net suitable for expansion and growth of an industry Complete unity of command exists in a line organisation 48 / 50 Pick out the wrong statement ? Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do not ionise None of these Molecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar Most of the hydrocarbons are non-polar 49 / 50 Pick out the wrong statement ? Geothermal energy is a non-conventional source of energy Inhalation of mercury vapour is not harmful for human beings Inhalation of arsenic causes cancer Mass is converted into energy in both nuclear fission & fusion reaction 50 / 50 Pick out the wrong statement ? Mild steel sheet cannot be spot welded Seam welding, projection welding & spot welding are the classification of electrical resistance welding Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded) In spot welding, two pieces to be joined are overlapped and placed between two electrodes Provide Your Information Your score is The average score is 0% LinkedIn Facebook Twitter 0% Restart quiz Send feedback Share on facebook Facebook Share on twitter Twitter Share on whatsapp WhatsApp PrevChemical Engineering Basics Quiz 8 Chemical Engineering Basics Quiz 10Next
