Chemical Engineering MCQs

Page No. 396

Continuous shell temperature measurement in a liquid-liquid heat exchanger is done by a __________________?


aThermocouple

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bResistance thermometer

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cMercury in glass thermometer

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dVapor pressure thermometer

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View Answer Thermocouple

Time constant is the __________________?


aTime taken by the controlled variable to reach 63.2% of its full change

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bSame as transportation lag

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cSame as dead time

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dTime required by the measured variable to reach 63.2% of its ultimate change

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The maximum service temperature for fibre glass used as thermocouple wire insulation material is __________ °C?


a250

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b500

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c750

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d1000

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View Answer 500

A bimetallic thermometer as compared to industrial mercury in glass thermometer has almost the same_________________?


aTemperature measuring range (- 40°C to 450°C)

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bAccuracy (± 1% of span)

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cSpeed of response

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dAll a, b & c

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View Answer All a, b & c

Operating range of a temperature measuring instrument is 800 to 1600°C. It could be a/an _____________ pyrometer?


aRadiation

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bOptical

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cPhotoelectric

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dNone of these

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View Answer Photoelectric

Positioning controllers are used for _______________?


aLow loads

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bTemperature changes

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cHigh loads

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dFlow rate changes

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View Answer High loads

Reset rate is the another term used for ____________ time?


aDead

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bIntegral

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cDerivative

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dNone of these

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View Answer Integral

In a shell and tube heat exchanger, the flow rate of heating/cooling fluid is the ______________ variable?


aLoad

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bControlled

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cManipulated

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dNone of these

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View Answer Manipulated

The deflection in diaphragm (which is used as pressure sensor in pneumatic and electronic instruments) is dependent on the metal thickness, its diameter D. and shape & number of corrugations. Its deflection is proportional to_______________?


ad

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bd2

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cd3

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dd4

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View Answer d4

Nichol’s chart deals with __________________?


aA.R. vs. phase lag of first order

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bA.R. vs. phase lag of second order

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cClosed loop values vs. open loop values

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dFrequency response values of controllers

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