Chemical Engineering MCQs

Page No. 827

Spherical shape of mercury droplets is due to its____________________?


aHigh viscosity

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bLow surface tension

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cHigh density

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dHigh surface tension

✓


View Answer High surface tension

Increase in the entropy of a system represents the_____________________?


aDegradation of energy

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bDecrease in system pressure

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cIncrease in the availability of energy

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dIncrease in the temperature

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View Answer Degradation of energy

Damage to metal surface by mechanical action is called____________________?


aPitting

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bCorrosion

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cErosion

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dNone of these

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View Answer Erosion

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


aFracture strength

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bYield strength

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cElastic limit

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dLimit of proportionality

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View Answer Fracture strength

Materials having ________________ lattice structure are usually the most ductile ?


aBody centred cubic (bcc)

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bHexagonal close packed (hcp)

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cFace centred cubic (fcc)

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dNone of these

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


aElastic limit

✓


bMachining properties

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cDuctility

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dResilience

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View Answer Elastic limit

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


a1.2 to 2.5

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b4.5 to 6.2

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c7.5 to 8.5

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d10.5 to 15.5

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View Answer 4.5 to 6.2

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


aIncreases

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bDecreases

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cRemain same

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dMay increase or decrease (depends on the suction pressure)

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View Answer Increases

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


aSteel

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bCast iron

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cAluminium

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dNone of these

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View Answer Cast iron

With increase in temperature, the surface tension of water_______________________?


aIncreases

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bDecreases

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cRemain constant

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dIncreases linearly

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View Answer Decreases

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