Chemical Engineering MCQs

Page No. 827

Spherical shape of mercury droplets is due to its____________________?


aHigh viscosity


bLow surface tension


cHigh density


dHigh surface tension


View Answer High surface tension

Increase in the entropy of a system represents the_____________________?


aDegradation of energy


bDecrease in system pressure


cIncrease in the availability of energy


dIncrease in the temperature


View Answer Degradation of energy

Damage to metal surface by mechanical action is called____________________?


aPitting


bCorrosion


cErosion


dNone of these


View Answer Erosion

Stresses encountered in the metal forming processes are less than the _____________ of the material?


aFracture strength


bYield strength


cElastic limit


dLimit of proportionality


View Answer Fracture strength

Materials having ________________ lattice structure are usually the most ductile ?


aBody centred cubic (bcc)


bHexagonal close packed (hcp)


cFace centred cubic (fcc)


dNone of these



Presence of nickel & chromium in steel does not raise its _________________?


aElastic limit


bMachining properties


cDuctility


dResilience


View Answer Elastic limit

Current employed in resistance welding ranges from ____________________ kVA/cm2?


a1.2 to 2.5


b4.5 to 6.2


c7.5 to 8.5


d10.5 to 15.5


View Answer 4.5 to 6.2

With increase in compression ratio, the volumetric efficiency of air compressor____________________?


aIncreases


bDecreases


cRemain same


dMay increase or decrease (depends on the suction pressure)


View Answer Increases

Compressed dry air is used as the cutting fluid, while machining____________________?


aSteel


bCast iron


cAluminium


dNone of these


View Answer Cast iron

With increase in temperature, the surface tension of water_______________________?


aIncreases


bDecreases


cRemain constant


dIncreases linearly


View Answer Decreases

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