Chemical Engineering MCQs

Page No. 783

Dislocation cross-slip is difficult in those materials, which have___________________?


aLarge number of slip systems

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bHigh work hardening rate

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cCoarse grain size

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dLow stacking fault energy

✓



In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?


a20

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b60

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c120

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d∞

✓


View Answer ∞

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be _________________ toys ?


a250

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b500

✓


c1000

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d3000

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View Answer 500

A solid aluminium ball, when quenched in a water bath maintained at 40°C, cools down from 550°C to 450°C in 20 seconds. The expected temperature of the ball after next 20 seconds may be about ____________________ °C?


a370

✓


b340

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c320

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d300

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View Answer 370

Spark plug is provided in a/an_________________?


aEngine having carburettor

✓


bDiesel engine

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cCompression ignition engine

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dBoth B. & C.

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Pick out the correct statement about the condensation?


aFilmwise condensation gives a lower heat transfer rate than the dropwise condensation

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bSuitable coating or vapour additive is used to promote film wise condensation

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cIf a condensing liquid does not wet the surface dropwise, even then condensation will take place on it

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dReynolds number of condensing liquid is based on its mass flow rate

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Pick out the wrong statement ?


aSeam welding, projection welding & spot welding are the classification of electrical resistance welding

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bElectrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)

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cIn spot welding, two pieces to be joined are overlapped and placed between two electrodes

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dMild steel sheet cannot be spot welded

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Pick out the wrong statement ?


aLead can creep under its own weight at room temperature

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bThe electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement

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cRecrystallisation temperature decreases with decrease in strain in a cold worked metal

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dWith increase in temperature, the electrical conductivity of intrinsic semi-conductor will

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Identify the correct statement?


aSphlerite is zinc oxide

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bThe first law of the thermodynamics is stated as δE = δQ – δW

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cLead can be produced in a blast furnace

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dT. ferrooxidans is a fungus that can be used for leaching chalcopyrite

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Pick out the wrong statement about the machinability of metals. Machinability of a metal ?


aDecreases with increase in strain hardening tendencies

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bDecreases with increase in hardness, in general

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cDepend on the composition, microstructure and physical & mechanical properties

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dDecreases with increases in tensile strength & decrease in grain size

✓



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