Chemical Engineering MCQs

Page No. 801

Heat flow across a hollow sphere of inner radius ‘r1’ and outer radius ‘r2’ is directly proportional to__________________?


a(r2 – r1)/r1. r2

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br1. r2/(r2 – r1)

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c(r2 + r1)/r1. r2

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dr1. r2/(r2 + r1)

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View Answer r1. r2/(r2 – r1)

Plasma is_____________________?


aA high temperature neutral gas

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bNothing but ionised gas

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cA source of steady and highest controllable pressure

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dFormed at very low temperature

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Materials having resistivity ranging from 1 to 100 ohm. cm is termed as___________________?


aConductor

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bInsulator

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cSemi-conductor

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dNone of these

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View Answer Semi-conductor

Steel containing low percentage of nickel, chromium & tungsten are termed as the _____________ steel ?


aWrought

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bTool

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cAlloy

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dPlain carbon

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View Answer Plain carbon

The most important requirement for aluminium industry is the availability of cheap _______________?


aOre

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bElectrical power

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cLabour

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dAbundant water

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View Answer Electrical power

Which of the following is a boiler accessory i.e., not a boiler mounting ?


aBlow off cock

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bBlow off cock

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cFeed water pump

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dStop valve

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View Answer Feed water pump

What is the value of included angle of a triangular notch for maximum discharge ?


a30°

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b60°

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c90°

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d120°

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View Answer 90°

Diamagnetic materials___________________?


aAre magnetised by eddy currents only

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bAre non-magnetic and cannot be magnetised

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cAre magnetised in direction opposite to the magnetic field

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dCan be magnetised in one direction only

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The hardenability of steel decreases with__________________?


aDecrease in dislocation density

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bIncrease in solutionising temperature

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cIncrease in strength

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dDecrease in grain size

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For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?


aTemperature – entropy

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bTemperature – pressure

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cEnthalpy – entropy

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dEnthalpy-pressure

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