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

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bConductor

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cSolid semi-conductor

✓


dLiquid semi-conductor

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View Answer Solid semi-conductor

Thermistors are used in ____________ devices?


aVoltage measuring

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bTemperature measuring

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cTemperature compensating

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dBoth B. & C.

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View Answer Both B. & C.

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


aPointer

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bBourdon tube

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cBulb

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dNone of these

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View Answer Bourdon tube

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


aLoad

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bManipulated

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cManipulated

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dNone of these

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View Answer Load

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


aRadiation/infrared pyrometer

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bFilled system thermometer

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cMercury in glass thermometer

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dThermo electric pyrometer

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A pyrheliometer is an instrument used for measuring the_________________?


aBright sunshine period

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bBeam radiation

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cDiffuse radiation

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dNone of these

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View Answer Beam radiation

On-off controllers are normally used for________________?


aLow loads

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bTemperature changes

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cFlow rate changes

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dNone of these

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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

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bKc is increased

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cIntegral control action is introduced

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dDerivative control action is introduced

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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

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bA monotonic decrease

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cInitially increasing and then decreasing

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dIncreasing decreasing and then increasing

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View Answer A monotonic increase

Thermal wells used in temperature measurements should have __________________?


aVery thick walls

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bLow emissivity

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cPolished surface

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dHigh transmissivity of radiation

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