Chemical Engineering MCQs

Page No. 812

Chromium molybdenum steel cannot be welded using ______________ welding ?


aThermit


bElectrical resistance


cOxy-acetylene


dAny of these


View Answer Electrical resistance

Nitriding of a steel part does not increase its__________________?


aGrain size


bFatigue limit


cSurface hardness


dWear resistance


View Answer Grain size

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by_________________?


aConduction


bConvection


cRadiation


dBoth A. & B.


View Answer Radiation

Evaporative cooling process employs a combination of cooling and humidification in which the____________________?


aSensible heat is added


bSensible heat is removed and the latent heat is added


cLatent heat is removed


dSensible heat is added and latent heat is removed



Heating the Hypo-eutectoid steels to 30°C above the upper critical temperature line, soaking at that temperature and then cooling slowly to the room temperature to form a pearlite & ferrite structure is called_______________________?


aTempering


bHardening


cAnnealing


dNormalising


View Answer Annealing

The difference in one unit of Rockwell hardness number corresponds to a difference in the depth of indentation of ______________ mm ?


a0.001


b0.01


c0.002


d0.02


View Answer 0.002

Electrical conductivities of semi-conductors are of the order of ______________ ohm/cm ?


a10-3


b103


c10-15


d1015


View Answer 10-3

Maximum hardenability of steel depends upon its_______________________?


aChemical composition


bCarbon content


cGrain size


dAlloying elements content



Angular displacement can be measured suitably by a______________________?


aShaft encoder


bLinear variable differential transducer (LVDT)


cStroboscope


dTachometer


View Answer Shaft encoder

Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?


aGr0.25, Gr


bGr0.25, Gr0.33


cGr, Gr0.25


dGr0.33, Gr0.25


View Answer Gr0.25, Gr

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