Chemical Engineering MCQs

Page No. 783

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


aLarge number of slip systems


bHigh work hardening rate


cCoarse grain size


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


b60


c120


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


b500


c1000


d3000


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


c320


d300


View Answer 370

Spark plug is provided in a/an_________________?


aEngine having carburettor


bDiesel engine


cCompression ignition engine


dBoth B. & C.



Pick out the correct statement about the condensation?


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


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


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


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



Pick out the wrong statement ?


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


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


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


dMild steel sheet cannot be spot welded



Pick out the wrong statement ?


aLead can creep under its own weight at room temperature


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


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


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



Identify the correct statement?


aSphlerite is zinc oxide


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


cLead can be produced in a blast furnace


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



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


aDecreases with increase in strain hardening tendencies


bDecreases with increase in hardness, in general


cDepend on the composition, microstructure and physical & mechanical properties


dDecreases with increases in tensile strength & decrease in grain size



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