Chemical Engineering MCQs

Page No. 381

Feed forward controller accounts for the ______________ changes?


aSet point


bLoad


cBoth A. & B.


dNeither A. nor B.


View Answer Load

Thermal wells are used in the temperature measurement to____________________?


aGuard against corrosive and oxidising action on thermocouple materials


bReduce measuring lag


cIncrease the fidelity


dIncrease the sensitivity



Liquid flow rate in a small channel is best measured by a/an____________________?


aWeir


bPitot tube


cVane meter


dVenturimeter


View Answer Pitot tube

A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is______________?


a45°


b-90°


c-180°


d-45°


View Answer -45°

Pick out the most suitable instrument for measuring temperature in the range of-40 to 425°C ?


aMercury thermometer


bBimetallic thermometer


cRadiation pyrometer


dNone of these



What is the normal percentage of rhodium in platinum + rhodium element used in the thermocouple ?


a0.1


b3


c13


d29


View Answer 13

Cascade control means _______________?


aFeed forward control


bMore than one feed-back loop


cOn-off control


dOne feed-back loop



In Bode plot, φ vs. ω is plotted on a/an ______________ graph paper?


alog-log


bOrdinary


cSemi-log


dTriangular


View Answer log-log

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


aIron-constantan


bChromel-alumel


cCopper-constantan


dPlatinum-platinum/rhodium



The thermal emf-temperature relationship of most thermocouples is_________________?


aLinear


bParabolic


cExponential


dSquare root


View Answer Parabolic

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