Chemical Engineering MCQs

Page No. 813

Titanium is added to molten aluminium alloys before casting for the purpose of_____________________?


aGrain refinement


bIncreasing corrosion resistance


cReducing porosity


dImproving fluidity


View Answer Improving fluidity

Theoretical volume of oxygen required for complete combustion of 1Nm3 of acetylene, in oxy-acetylene welding is ______________ Nm3 ?


a0.5


b1


c1/3


d2.5


View Answer 2.5

A high pressure boiler generates steam at a pressure greater than _____________________ kg/cm2 ?


a10


b30


c50


d80


View Answer 80

The best lubricants for a machine working at high temperature & load is_________________?


aGrease


bSolid lubricant


cAnimal oils


dMineral oils


View Answer Solid lubricant

Blast furnace slag is mainly molten_________________?


aSand


bMagnesium silicate


cCalcium silicate


dIron pyrite


View Answer Calcium silicate

Ammonia leakage in the refrigeration system is detected by_________________?


aSulphur stick, which on detection gives white smoke


bUsing chemical reagents


cIts smell


dSoap solution



Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?


aEmissivity of pipe surface


bDiameter & length of the pipe


cTemperature of hot pipe surface & that of air in the room


dNone of these


View Answer None of these

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of ?


aGrashoff number


bGrashoff number & Reynolds number


cReynolds number


dGrashoff number & Prandtl number



Cast iron contains ____________________ percent carbon?


a2.5


b3.75


c4.75


d5.25


View Answer 2.5

Wrought iron is not____________________?


aDuctile & resistant to corrosion/rusting


bWeldable easily


cHaving uniform strength in all directions


dHaving maximum tensile strength along the lines of slag distribution



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