Chemical Engineering MCQs

Page No. 791

Half life of a radioactive isotope corresponds to the time required for half of the _______________ to decay ?


aAtoms

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bNeutrons

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cNucleons

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dElectrons

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View Answer Atoms

Which of the following mainly decides the current to be employed is arc welding ?


aElectrode size

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bPlate thickness

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cVoltage across the arc

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dWelded portion length

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View Answer Electrode size

Main constituent of bone ash is____________________?


aAmmonium phosphate

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bCalcium phosphate

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cAnimal charcoal

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dAmmonium sulphate

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View Answer Calcium phosphate

Isotropic materials have the same _______________________ in all directions?


aInduced stresses

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bDensity

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cElastic properties

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dThermal properties

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View Answer Elastic properties

Projection welding & stud welding is categorised as the _______________ welding?


aPressure

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bThermit

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cResistance

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dArc

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View Answer Resistance

The following thermocouple may be used for measuring temperature upto 1873°K__________________?


aChromel-alumel

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bCopper-constantan

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cPlatinum-platinum rhodium

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dIron-constantan

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Drossing is a _______________________ operation?


aSmelting

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bDressing

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cRoasting

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dDressing

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View Answer Roasting

Lead pencil contains____________________?


aGraphite

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bLead sulphide

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cLead

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dBoth B. & C.

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View Answer Graphite

Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process ?


aGalvanising

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bTinning

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cSherardizing

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dNone of these

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View Answer Sherardizing

The underground well of a bio gas plant is called the________________?


aSeptic tank

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bOxidation well

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cDigestor

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dLagoon

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View Answer Digestor

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