0% 0 Chemical Engineering Basics Quiz 11 1 / 50 The best guide to judge the general quality of water is the measurement of its___________? Turbidity pH value Electrical conductivity Dissolved oxygen content 2 / 50 The expected efficiency of a single riveted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased _____ times ? Six Four Two Eight 3 / 50 The cathode in an electrochemical cell always carries______? Zero charge Positive charge Negative charge Positive or negative charge depending upon the nature of the cell 4 / 50 The main charge in blast furnace is usually_____? Limestone, coke & iron ore Limestone, sand & iron ore Iron ore, coke & air Iron ore & coke 5 / 50 The effect of friction on the flow of steam through a nozzle is to decrease the ________ of steam? Wetness Mass flow rate Both A & B Neither A nor B 6 / 50 The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 ? 10-16 m2S-1 and it is 1.94 ? 10-14 m2S- 1 at 1200 K. The activation energy (in k. J.mole-1) for the diffusion of Ni in Cu is__________? 180 130 230 250 7 / 50 The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the________? Stress recovery effect Work hardening Creeping effect Bauschinger effect 8 / 50 The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K-1mole-1) ? 230 J 4600 J 2.3 ? 106 J 2300 J 9 / 50 The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is_____? Bright annealing Patenting None of these Full annealing 10 / 50 The best lubricants for a machine working at high temperature & load is__________? Mineral oils Solid lubricant Grease Animal oils 11 / 50 The concentration of (H+) ions is 4 x 10-5 in a solution. Then pH of the solution will be (Given log 4 = 0.6) ? 4.4 5.6 8.4 2.4 12 / 50 The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ? x-0.8 x1.5 x-1.5 x0.8 13 / 50 The difference between gross & net calorific values of fuel is due to the_____? Heat lost by radiation Sensible heat carried away by the flue gases Heat carried away by the steam from the moisture content of the fuel Heat carried away by steam from the combustion of hydrogen in the fuel 14 / 50 The highest stress that a material can withstand for a specified length of time without excessive deformation is called the _____ strength ? Creep None of these Fatigue Endurance 15 / 50 The efficiency of a Carnot heat engine operating between absolute temperatures T1 and T2 (when, T1 > T2) is given by (T1 ? T2)/T1. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T1 and T2 is given by__________? T1/T2 T2/T1 T2/(T1-T2) T1/(T1-T2) 16 / 50 The maximum stress below which a material can withstand an infinite number of cycle of stress, is termed as the_________? Endurance limit Resilience Fatigue strength Creep strength 17 / 50 The following thermocouple may be used for measuring temperature upto 1873?K___________? Platinum-platinum rhodium Iron-constantan Chromel-alumel Copper-constantan 18 / 50 The activity of pure hydrogen gas at 1000?C and 5 atm pressure__________? Is always less than 1 Depends on the choice of the standard state Is always greater than 1 Can be 5 19 / 50 The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of _______ mm ? 0.002 0.01 0.02 0.001 20 / 50 The cooling rate required to freeze 1 ton of water at 0?C into ice at 0?C in 24 hours is _______ BTU/hr? 100 1000 2000 200 21 / 50 The Al2O3 content of cryolite in Hall-Heroult cell is maintained between ________ percent ? 5-Feb 18-20 12-Jun 15-Dec 22 / 50 The dimensional formula of bulk modulus of elasticity is same as that of the ______? Density Force None of these Pressure 23 / 50 The atmospheric temperature during melting of ice/snow (in the atmosphere)__________? Decreases May increase or decrease; depends on the altitude where snow melts Remain same Increases 24 / 50 The activity co-efficient of the solute in a dilute solution ? Increases with the increase of concentration of the solute Decreases with the increase of concentration of the solute Is unity at infinite dilution Remains constant 25 / 50 The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the ______ of the slag ? Viscosity Fluidity Acidity Basicity 26 / 50 The co-ordination number in simple cubic structure is_____? 6 4 12 8 27 / 50 The delivery pressure of boiler feed water pump compared to the boiler steam pressure is_____? Slightly less Slightly more Much more Same 28 / 50 The hardenability of steel decreases with___________? Increase in strength Decrease in grain size Decrease in dislocation density Increase in solutionising temperature 29 / 50 The boiling & freezing points on a newly defined temperature scale in degree ?D? are 400?D & 100?D respectively. The temperature reading corresponding to 60?C on this new temperature scale will be equal to ______ ?D ? 140 240 280 180 30 / 50 The approximate height of a blast furnace having a useful volume of 2000 m3 is about ________ metres ? 75 25 55 35 31 / 50 The main constituent of bones is ________? Ca3(PO4)2 CaF2 CaCO3 CaCl2 32 / 50 The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ? Copper Wrought iron Aluminium Lead 33 / 50 The excess air required for the combustion of pulverized coal is of the order of about ________ percent ? 5 15 30 45 34 / 50 The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their___________? (Molecular weight)2 Molecular weight Equivalent weight (Equivalent weight)2 35 / 50 The lightest non-inflammable gas is__________? Ar O2 He H2 36 / 50 The majority charge carriers in p-type silicon are________? Holes Conduction electrons Free electrons Ions 37 / 50 The burnout heat flux in the nucleate boiling regime is not a function of the__________? Liquid density Vapour density Heat of evaporation Temperature difference 38 / 50 The emf of a Deniell cell ?Zn | Zn2+ || Cu2+ | Cu? can be increased by__________? Increasing the concentration of copper sulphate solution Increasing the surface area of the electrodes Increasing the concentration of zinc sulphate solution Decreasing the surface area of the electrodes 39 / 50 The condition of diffraction from a crystal is given by_______? n? = 2d Sin ? ? = d Sin 2? n? = d Sin ? ? = 2d Sin 2? 40 / 50 The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong _______? Base and weak acid Base and strong acid None of these Acid and weak base 41 / 50 The leaching solvent used in Baeyer?s process for the purification of bauxite is_____? Sodium carbonate Ammonium hydroxide Sodium hydroxide Ammonium carbonate 42 / 50 The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for _______ at room temperature ? Mercury Water Alcohol Air 43 / 50 The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the _______ of a boiler ? Evaporative capacity Steam load Evaporation efficiency Thermal efficiency 44 / 50 The friction factor for the turbulent fluid flow in a rough pipe does not depend upon the__________? Fluid velocity Both B. & C. Pipe roughness & pipe diameter Type of flowing fluid 45 / 50 The elastic strain in copper is due to the___________? Motion of dislocations None of the above Stretching of atomic bonds Breakage of atomic bonds 46 / 50 The maximum thickness of the metal which can be welded using ultrasonic welding is ______ mm ? 25 0.5 10 3 47 / 50 The life of a ball bearing is inversely proportional to_________? (Load)1 (Load)2 (Load)0.33 (Load)3 48 / 50 The following type of bonding is strongly directional in solids ? Metallic Ionic Covalent Vander Waal?s 49 / 50 The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm.mole, its fugacity at 300 K would be_________? 5000Pa 3171Pa 3567Pa 1.01 ? 105Pa 50 / 50 The bank of tubes located at the back of the domestic refrigerators are the ________ tubes? Refrigerant cooling Condenser Evaporator Throttling 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 10 Chemical Engineering Basics Quiz 12Next
