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

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

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cRadiation heat transfer by increasing the temperature and reducing the emissivity

✓


dNone of these

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Colour comparator is used to measure the___________________?


apH value

✓


bElectrode potential

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cColour intensity

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dNone of these

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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

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b3

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c5

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d7

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View Answer 3

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


aUpward thrust due to air

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bViscous force exerted by air

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cSurface tension effects of water

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dForce of gravity

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


aTungsten carbide

✓


bHigh carbon steel

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cHigh speed steel

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dDrilling

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View Answer Tungsten carbide

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


aDry air

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bPure oxygen

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cMoisture

✓


dSunlight

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View Answer Moisture

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


aIncrease the heat loss

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bDecrease heat loss and will have no effect beyond that

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cDecrease heat flux

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dReduce convection heat loss compared to conduction heat less

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Case hardening is not done by________________?


aNitriding

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bHot dipping

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cElectroplating

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dBoth ‘B’ & ‘C’

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


aRemoved by acid pickling

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bHammered into the surface

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cRemoved with coarse emery cloth

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dLeft as such to protect the surface

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


aCopper-lead alloys

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bBabbitts

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cBronzes

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dCermets

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View Answer Cermets

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