Chemical Engineering MCQs

Page No. 805

Metalloids________________?


aAre good conductor of heat & electricity

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

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cAre not necessarily solids at room temperature

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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

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bPrevent oxide formation

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cWash away surplus solder

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dFull up the joint gap

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


aKerosene

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bWater

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cSodium stearate

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dLime water

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View Answer Sodium stearate

Fog is an example of colloidal system of___________________?


aSolid dispersed in gas

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bSolid dispersed in liquid

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cLiquid dispersed in gas

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dGas dispersed in liquid

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A jet engine turbine blade is normally manufactured by____________________?


aForging

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bShell moulding

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cInvestment casting

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dPressure die casting

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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

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bCold rolled mild

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cForged

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dMachinable stainless

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View Answer Cold rolled mild

Wrought iron does not have__________________?


aUniform strength in all directions

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bAbility to hold protective coating

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cHigh ductility & corrosion resistance

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dEasily weldable characteristics

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X-rays are__________________?


aPositively charged

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bNegatively charged

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cNeutral

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dOf higher wavelength than visible light

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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

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bRedundant work is a function of the die angle

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

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dHollow ram is used for indirect extrusion

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A solar cell converts the sunlight directly into ______________ energy?


aThermal

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bElectrical

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cMechanical

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dChemical

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View Answer Electrical

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