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


br1. r2/(r2 – r1)


c(r2 + r1)/r1. r2


dr1. r2/(r2 + r1)


View Answer r1. r2/(r2 – r1)

Plasma is_____________________?


aA high temperature neutral gas


bNothing but ionised gas


cA source of steady and highest controllable pressure


dFormed at very low temperature



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


aConductor


bInsulator


cSemi-conductor


dNone of these


View Answer Semi-conductor

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


aWrought


bTool


cAlloy


dPlain carbon


View Answer Plain carbon

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


aOre


bElectrical power


cLabour


dAbundant water


View Answer Electrical power

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


aBlow off cock


bBlow off cock


cFeed water pump


dStop valve


View Answer Feed water pump

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


a30°


b60°


c90°


d120°


View Answer 90°

Diamagnetic materials___________________?


aAre magnetised by eddy currents only


bAre non-magnetic and cannot be magnetised


cAre magnetised in direction opposite to the magnetic field


dCan be magnetised in one direction only



The hardenability of steel decreases with__________________?


aDecrease in dislocation density


bIncrease in solutionising temperature


cIncrease in strength


dDecrease in grain size



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


bTemperature – pressure


cEnthalpy – entropy


dEnthalpy-pressure



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