Chemical Engineering MCQs

Page No. 791

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


aAtoms


bNeutrons


cNucleons


dElectrons


View Answer Atoms

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


aElectrode size


bPlate thickness


cVoltage across the arc


dWelded portion length


View Answer Electrode size

Main constituent of bone ash is____________________?


aAmmonium phosphate


bCalcium phosphate


cAnimal charcoal


dAmmonium sulphate


View Answer Calcium phosphate

Isotropic materials have the same _______________________ in all directions?


aInduced stresses


bDensity


cElastic properties


dThermal properties


View Answer Elastic properties

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


aPressure


bThermit


cResistance


dArc


View Answer Resistance

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


aChromel-alumel


bCopper-constantan


cPlatinum-platinum rhodium


dIron-constantan



Drossing is a _______________________ operation?


aSmelting


bDressing


cRoasting


dDressing


View Answer Roasting

Lead pencil contains____________________?


aGraphite


bLead sulphide


cLead


dBoth B. & C.


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


bTinning


cSherardizing


dNone of these


View Answer Sherardizing

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


aSeptic tank


bOxidation well


cDigestor


dLagoon


View Answer Digestor

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