Chemical Engineering MCQs

Page No. 376

Which of the following filled system expansion thermometers has the lowest positive temperature measurement capability ?


aMercury in glass thermometer


bAlcohol in glass thermometer


cFused metal (Na or K) in steel thermometer


dNitrogen in steel thermometer



Working principle of mercury in glass thermometer is__________________?


aVolumetric expansion


bPressure rise with temperature


cLinear expansion


dNone of these


View Answer Volumetric expansion

In a closed loop system, the process to be controlled is an integrating process with transfer function 1/2s. The controller proposed to be used in an integral controller with transfer function 1/T1s. When a step change in set point is applied to such a closed loop system, the controlled variable will exhibit__________________?


aOverdamped response


bUnderdamped response


cUndamped response


dUnstable response


View Answer Underdamped response

A typical example of a physical system with under damped characteristic is a____________________?


aU-tube manometer


bSpring loaded diaphragm valve


cCSTR with first order reaction


dThermocouple kept immersed in a liquid filled thermowell



“A control system is unstable, if the open loop frequency response exhibits an amplitude ratio exceeding unity at the crossover frequency.” This is _______________ criterion?


aBode stability


bNyquist


cRouth stability


dNone of these


View Answer Bode stability

In a second order under damped system, the_________________?


aTime required for the response of first reach its ultimate value is called the response time


bOvershoot (which is a measure of how much the response exceeds the ultimate value) increase with the decrease of damping co-efficient


cDecay ratio (which is the ratio of the sizes of successive peaks) is equal to the reciprocal of overshoot


dNone of these



Which of the following cannot measure a temperature of 1600°C ?


aPlatinum resistance thermometer


bThermocouple


cPhoto-electric pyrometer


dRadiation pyrometer



Which of the following instruments is not used for measuring sub-zero (<0°) temperatures ?


aPlatinum resistance thermometer


bMercury in glass thermometer


cVapor pressure thermometer


dRadiation pyrometer


View Answer Radiation pyrometer

Maximum differential pressure in liquid manometer is ______________ psi?


a20


b30


c40


d50


View Answer 30

Which is the strongest paramagnetic gas ?


aCO2


bO2


cNO


dNO2


View Answer O2

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