Chemical Engineering MCQs

Page No. 384

Specific conductance is defined as the reciprocal of resistance in ohms of 1c.c. of liquid at a specified temperature. Its value for distilled water is about ______________ micro mho/cm3?


a50


b100


c10


d1


View Answer 1

An ideal PID controller has the transfer function [1 + (1/0.55) + 0.25]. The frequency at which the magnitude ratio of the controller is 1, is________________?


a0.5/0.2


b0.2/0.5


c0.2 × 0.5


d1/√(0.2 × 0.5)


View Answer 1/√(0.2 × 0.5)

Phase lag of the frequency response of a second order system to a sinusoidal forcing function______________?


aIs 30°


bIs 90° at the most


cApproaches 180° asymptotically


dIs 120°



Which of the following is an undesirable dynamic characteristic of an instrument ?


aReproducibility


bDead zone


cTime lag


dStatic error


View Answer Time lag

Typical specifications for design stipulates the gain margin and phase margin to be respectively__________________?


a> 1.7 and > 30°


b30°


c< 1.7


d1.7 and < 30°


View Answer > 1.7 and > 30°

Instrumentation in a plant offers the advantage of_______________?


aGreater safety of operation


bBetter quality of product


cGreater operation economy


dAll A., B. and C.


View Answer All A., B. and C.

Magnetic flowmeters are generally not used for the velocity/flow measurement of hydrocarbons due to their ?


aLow thermal conductivity


bLow electrical conductivity


cHigh viscosity index


dLow flash point



Routh stability method uses ______________ loop transfer function?


aOpen


bClosed


cEither A. or B.


dNeither A. nor B.


View Answer Closed

The function of a transducer is to _______________ ?


aModify the input signal


bAmplify the input signal


cConvert the primary signal into a more useful quantity, usually an electric impulse


dCodify/decodify the input signal



_______________ thermometer cannot measure sub-zero (< 0° C) temperature ?


aMercury in glass


bBimetallic


cVapor pressure


dResistance


View Answer Bimetallic

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