Chemical Engineering MCQs

Page No. 813

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


aGrain refinement

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bIncreasing corrosion resistance

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cReducing porosity

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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

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b1

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c1/3

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d2.5

✓


View Answer 2.5

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


a10

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b30

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c50

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d80

✓


View Answer 80

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


aGrease

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bSolid lubricant

✓


cAnimal oils

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dMineral oils

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View Answer Solid lubricant

Blast furnace slag is mainly molten_________________?


aSand

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bMagnesium silicate

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cCalcium silicate

✓


dIron pyrite

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View Answer Calcium silicate

Ammonia leakage in the refrigeration system is detected by_________________?


aSulphur stick, which on detection gives white smoke

✓


bUsing chemical reagents

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cIts smell

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dSoap solution

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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

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bDiameter & length of the pipe

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

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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

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bGrashoff number & Reynolds number

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cReynolds number

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dGrashoff number & Prandtl number

✓



Cast iron contains ____________________ percent carbon?


a2.5

✓


b3.75

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c4.75

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d5.25

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View Answer 2.5

Wrought iron is not____________________?


aDuctile & resistant to corrosion/rusting

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bWeldable easily

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cHaving uniform strength in all directions

✓


dHaving maximum tensile strength along the lines of slag distribution

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