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

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bAlcohol in glass thermometer

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cFused metal (Na or K) in steel thermometer

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dNitrogen in steel thermometer

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Working principle of mercury in glass thermometer is__________________?


aVolumetric expansion

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bPressure rise with temperature

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cLinear expansion

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dNone of these

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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

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bUnderdamped response

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cUndamped response

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dUnstable response

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View Answer Underdamped response

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


aU-tube manometer

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bSpring loaded diaphragm valve

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cCSTR with first order reaction

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dThermocouple kept immersed in a liquid filled thermowell

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“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

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bNyquist

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cRouth stability

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dNone of these

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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

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

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

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dNone of these

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


aPlatinum resistance thermometer

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bThermocouple

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cPhoto-electric pyrometer

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dRadiation pyrometer

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


aPlatinum resistance thermometer

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bMercury in glass thermometer

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cVapor pressure thermometer

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dRadiation pyrometer

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View Answer Radiation pyrometer

Maximum differential pressure in liquid manometer is ______________ psi?


a20

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b30

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c40

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d50

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View Answer 30

Which is the strongest paramagnetic gas ?


aCO2

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bO2

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cNO

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dNO2

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View Answer O2

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