Chemical Engineering MCQs

Page No. 404

Stabilising time for the controllers is the time required for the response to reach _____________ percent of its ultimate value?


a63.2


b87.5


c95


d100


View Answer 95

Thermistors are made of__________________?


aUltra pure metals


bMetal oxides


cIron-copper alloys


dNickel-chromium alloys


View Answer Metal oxides

A pyranometer is an instrument used for measuring the___________________?


aBeam radiation


bGlobal radiation


cBright sunshine period


dNone of these


View Answer Global radiation

The transfer function for an ideal proportional plus reset controller (reset time T) is_______________?


aKc[1 + (1/TS)]


bKc(1 + TS)


cKc/(1 + TS)


dKc/[1 + (s/T)]


View Answer Kc[1 + (1/TS)]

Radiation thermometer cannot measure the temperature ___________________?


aInside a pressure vessel


bOf an object without coming in contact with it


cOf liquid oxygen


dOf moving objects at high temperature


View Answer Of liquid oxygen

Which of the following thermocouples has the least temperature measurement range ?


aCopper-constantan


bChromel-alumel


cPlatinum-platinum/rhodium


dIron-constantan


View Answer Copper-constantan

Platinum resistance thermometer can be used upto antimony point which is ____________ °C, and is the temperature of equilibrium between solid antimony & liquid antimony at normal atmospheric pressure?


a961.93


b630.74


c1064.43


d1261.93


View Answer 630.74

Temperature of _____________ cannot be measured by an optical or radiation pyrometer?


aHot blast (air) from stoves


bMolten slag flowing out of blast furnace


cCombustion space in boilers


dRotary limestone calcination kiln



The Laplace transform of exp(at), where a > 0, is defined only for the Laplace parameter, s > a since______________?


aThe function is exponential


bThe Laplace transform of integral of exp(at) has finite values only for s > a


cThe Laplace transform integral of exp(at) has initial values only for s > a


dThe function exp(at) is piece-wise continuous only for s > a



Mercury thermometer can be used to measure the temperature upto ____________ °C?


a100


b250


c250


d750


View Answer 250

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