Chemical Engineering MCQs

Page No. 381

Feed forward controller accounts for the ______________ changes?


aSet point

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bLoad

✓


cBoth A. & B.

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dNeither A. nor B.

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View Answer Load

Thermal wells are used in the temperature measurement to____________________?


aGuard against corrosive and oxidising action on thermocouple materials

✓


bReduce measuring lag

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cIncrease the fidelity

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dIncrease the sensitivity

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


aWeir

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bPitot tube

✓


cVane meter

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dVenturimeter

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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°

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b-90°

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c-180°

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d-45°

✓


View Answer -45°

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


aMercury thermometer

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bBimetallic thermometer

✓


cRadiation pyrometer

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dNone of these

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


a0.1

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b3

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c13

✓


d29

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View Answer 13

Cascade control means _______________?


aFeed forward control

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bMore than one feed-back loop

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cOn-off control

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dOne feed-back loop

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


alog-log

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bOrdinary

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cSemi-log

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dTriangular

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View Answer log-log

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


aIron-constantan

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bChromel-alumel

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cCopper-constantan

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dPlatinum-platinum/rhodium

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The thermal emf-temperature relationship of most thermocouples is_________________?


aLinear

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bParabolic

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cExponential

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dSquare root

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View Answer Parabolic

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