Chemical Engineering MCQs

Page No. 379

If response of a control system is to be free of offset and oscillation, the most suitable controller is_________________?


aProportional controller

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bProportional-derivative (PD) controller

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cProportional-integral (PI) controller

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dProportional integral-derivative (PID) controller

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For two non-interacting first order systems connected in series, the overall transfer function is the ______________ of the individual transfer functions?


aProduct

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bSum

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cRatio

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dDifference

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View Answer Product

Which of the following thermocouples is capable of measuring a temperature of -50°C ?


aPlatinum-platinum + rhodium

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bChromel-Alumel

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cIron-constantan

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dCopper-constantan

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Reference points i.e., ice point and steam point in Reaumer temperature scale are respectively_________________?


a– 273° & 80°

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b0° & 80°

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c32° & 460°

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d32° & 80°

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View Answer 0° & 80°

Non-metallic diaphragm used as pressure sensor in instruments is generally made of__________________?


aTeflon

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bSynthetic rubber

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cBakelite

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dThick paper

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View Answer Synthetic rubber

In second order underdamped system ?


aDecay ratio = overshoot

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bDecay ratio = (overshoot)2

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cOvershoot increases for increasing damping co-efficient

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dLarge damping co-efficient means smaller damping

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Bimetal strips are not used in________________?


aBimetallic thermometers

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bThermocouples

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cThermostats

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dRelays for opening & closing of electrical circuits

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View Answer Thermocouples

A manometer measures the _____________ pressure?


aAtmospheric

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bAbsolute

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cGauge

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dNone of these

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View Answer Gauge

Compositional analysis of flue gas coming out of a furnace in respect of O2 and CO2% can be continuously done by a/an___________________?


aOrsat apparatus

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bThermal conductivity cell

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cZirconia probe

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dChromatograph

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Mercury thermometer is commonly used for low temperature measurement. The freezing point and boiling point of mercury are respectively _____________ °C?


a– 39 and 350

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b– 51 and 439

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c– 79 and 395

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d– 10 and 425

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View Answer – 39 and 350

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