Chemical Engineering MCQs

Page No. 805

Metalloids________________?


aAre good conductor of heat & electricity


bAct as electron donors with metals & as electron acceptor with non-metals


cAre not necessarily solids at room temperature


dAre compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron



Use of flux during soldering is done to__________________?


aIncrease fluidity of solder by lowering its melting temperature


bPrevent oxide formation


cWash away surplus solder


dFull up the joint gap



_________________ is the most suitable lubricant for drawing mild steel wires?


aKerosene


bWater


cSodium stearate


dLime water


View Answer Sodium stearate

Fog is an example of colloidal system of___________________?


aSolid dispersed in gas


bSolid dispersed in liquid


cLiquid dispersed in gas


dGas dispersed in liquid



A jet engine turbine blade is normally manufactured by____________________?


aForging


bShell moulding


cInvestment casting


dPressure die casting


View Answer Investment casting

Square steel key is normally strong in failure by shear & crushing. Keys are normally made of _______________ steel bars?


aHot rolled mild


bCold rolled mild


cForged


dMachinable stainless


View Answer Cold rolled mild

Wrought iron does not have__________________?


aUniform strength in all directions


bAbility to hold protective coating


cHigh ductility & corrosion resistance


dEasily weldable characteristics



X-rays are__________________?


aPositively charged


bNegatively charged


cNeutral


dOf higher wavelength than visible light


View Answer Neutral

In extrusion of metals, which of the following statement is true ?


aSpeed of the extruded material is same as that of ram speed


bRedundant work is a function of the die angle


cRelative motion between the billet surface and the container wall is always present


dHollow ram is used for indirect extrusion



A solar cell converts the sunlight directly into ______________ energy?


aThermal


bElectrical


cMechanical


dChemical


View Answer Electrical

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