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

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cHardness

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dBoth B & C

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View Answer Impact strength

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


aRefrigerant cooling

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bEvaporator

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cCondenser

✓


dThrottling

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View Answer Condenser

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


aScratch

✓


bIndentation

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cDynamic

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dRebound

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View Answer Scratch

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


aAluminium

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bTin

✖


cLead

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dBoth B. & C.

✓


View Answer Both B. & C.

Screws are specified by their _____________ diameters?


aMinor

✖


bMajor

✓


cPitch

✖


dNone of these

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View Answer Major

Cupola produces _________________ iron?


aPig

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bCast

✓


cWrought

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dCarbon free

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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

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bExcess of

✓


cDecrease in

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dNone of these

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View Answer Excess of

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


aConduction

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bRadiation

✓


cNatural convection

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dForced convection

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View Answer Radiation

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


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

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bPhosphate coating is less corrosion resistant than chromate coating

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

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dCalorising is the process of coating steel with chromium

✓



Nusselt number/Biot number varies___________________?


aInversely with thermal conductivity

✓


bDirectly with heat transfer co-efficient

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cDirectly with thermal conductivity

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dInversely with the dimension of the solid

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