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


bProportional-derivative (PD) controller


cProportional-integral (PI) controller


dProportional integral-derivative (PID) controller



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


aProduct


bSum


cRatio


dDifference


View Answer Product

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


aPlatinum-platinum + rhodium


bChromel-Alumel


cIron-constantan


dCopper-constantan



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


a– 273° & 80°


b0° & 80°


c32° & 460°


d32° & 80°


View Answer 0° & 80°

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


aTeflon


bSynthetic rubber


cBakelite


dThick paper


View Answer Synthetic rubber

In second order underdamped system ?


aDecay ratio = overshoot


bDecay ratio = (overshoot)2


cOvershoot increases for increasing damping co-efficient


dLarge damping co-efficient means smaller damping



Bimetal strips are not used in________________?


aBimetallic thermometers


bThermocouples


cThermostats


dRelays for opening & closing of electrical circuits


View Answer Thermocouples

A manometer measures the _____________ pressure?


aAtmospheric


bAbsolute


cGauge


dNone of these


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


bThermal conductivity cell


cZirconia probe


dChromatograph



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


a– 39 and 350


b– 51 and 439


c– 79 and 395


d– 10 and 425


View Answer – 39 and 350

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