Chemical Engineering MCQs

Page No. 832

A reduction in thermal resistance during heat transfer does not occur in the___________________?


aConvection heat transfer by stirring the fluid and cleaning the heating surface


bConduction heat transfer by reduction in the material thickness and increase in the thermal conductivity


cRadiation heat transfer by increasing the temperature and reducing the emissivity


dNone of these



Colour comparator is used to measure the___________________?


apH value


bElectrode potential


cColour intensity


dNone of these


View Answer pH value

Volume of blast furnace slag is about _______________ times the volume of hot metal (pig iron) of the same weight ?


a1.5


b3


c5


d7


View Answer 3

Rain drops falling through atmospheric air attain limited terminal velocity, because of ____________________?


aUpward thrust due to air


bViscous force exerted by air


cSurface tension effects of water


dForce of gravity



Powder metallurgy technique is used in the production of ____________________ tools ?


aTungsten carbide


bHigh carbon steel


cHigh speed steel


dDrilling


View Answer Tungsten carbide

Chlorine acts as a bleaching agent only in the presence of ______________________?


aDry air


bPure oxygen


cMoisture


dSunlight


View Answer Moisture

Upto the critical radius of insulation, added insulation, will____________________?


aIncrease the heat loss


bDecrease heat loss and will have no effect beyond that


cDecrease heat flux


dReduce convection heat loss compared to conduction heat less



Case hardening is not done by________________?


aNitriding


bHot dipping


cElectroplating


dBoth ‘B’ & ‘C’



Oxide layer formed on the non-ferrous metal surface after its annealing is__________________?


aRemoved by acid pickling


bHammered into the surface


cRemoved with coarse emery cloth


dLeft as such to protect the surface



Which of the following is not used as a bearing material ?


aCopper-lead alloys


bBabbitts


cBronzes


dCermets


View Answer Cermets

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