Chemical Engineering MCQs

Page No. 392

Thermistor, which has high temperature co-efficient of resistivity, is used as the sensing element in resistance thermometer. It is a/an ?


aInsulator


bConductor


cSolid semi-conductor


dLiquid semi-conductor


View Answer Solid semi-conductor

Thermistors are used in ____________ devices?


aVoltage measuring


bTemperature measuring


cTemperature compensating


dBoth B. & C.


View Answer Both B. & C.

The ____________ of a vapor pressure thermometer is a secondary element ?


aPointer


bBourdon tube


cBulb


dNone of these


View Answer Bourdon tube

In a shell and tube heat exchanger, the inlet temperature of heating/cooling fluid is the ____________ variable?


aLoad


bManipulated


cManipulated


dNone of these


View Answer Load

Which of the following temperature measuring instruments need not touch the object whose temperature is being measured ?


aRadiation/infrared pyrometer


bFilled system thermometer


cMercury in glass thermometer


dThermo electric pyrometer



A pyrheliometer is an instrument used for measuring the_________________?


aBright sunshine period


bBeam radiation


cDiffuse radiation


dNone of these


View Answer Beam radiation

On-off controllers are normally used for________________?


aLow loads


bTemperature changes


cFlow rate changes


dNone of these


View Answer Low loads

A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if________________?


aKc is reduced


bKc is increased


cIntegral control action is introduced


dDerivative control action is introduced


View Answer Kc is increased

The unit step response of the transfer function (2s – 1)/[(3s + 1) (4s + 1)] reaches its final steady state asymptotically after _____________?


aA monotonic increase


bA monotonic decrease


cInitially increasing and then decreasing


dIncreasing decreasing and then increasing


View Answer A monotonic increase

Thermal wells used in temperature measurements should have __________________?


aVery thick walls


bLow emissivity


cPolished surface


dHigh transmissivity of radiation



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