Chemical Engineering MCQs

Page No. 766

With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and _____________ is not affected ?


aImpact strength


bPercent elongation


cHardness


dBoth B & C


View Answer Impact strength

The bank of tubes located at the back of the domestic refrigerators are the _______________ tubes?


aRefrigerant cooling


bEvaporator


cCondenser


dThrottling


View Answer Condenser

Mho’s scale of hardness, which consists of 10 standard minerals is used for the measurement of _______________ hardness?


aScratch


bIndentation


cDynamic


dRebound


View Answer Scratch

Electrometallurgy is not involved in the extraction of ___________________ from its ore?


aAluminium


bTin


cLead


dBoth B. & C.


View Answer Both B. & C.

Screws are specified by their _____________ diameters?


aMinor


bMajor


cPitch


dNone of these


View Answer Major

Cupola produces _________________ iron?


aPig


bCast


cWrought


dCarbon free


View Answer Cast

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalent bonds resulting in _______________ electrons ?


aLack of free


bExcess of


cDecrease in


dNone of these


View Answer Excess of

In a furnace with heating element temperature at 1700°C, the dominant mechanism of heat transfer will be__________________?


aConduction


bRadiation


cNatural convection


dForced convection


View Answer Radiation

Pick out the wrong statement about coating/electroplating of metals ?


aPhosphate coating is used as an excellent base for paints & enamels


bPhosphate coating is less corrosion resistant than chromate coating


cThe base metal to be electroplated is normally made the cathode of the electrolytic cell and coating metal is made the anode


dCalorising is the process of coating steel with chromium



Nusselt number/Biot number varies___________________?


aInversely with thermal conductivity


bDirectly with heat transfer co-efficient


cDirectly with thermal conductivity


dInversely with the dimension of the solid



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