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