Chemical Engineering MCQs

Page No. 380

A stable system is the one___________________?


aFor which the output response is bounded for all bounded input


bWhich exhibits an unbounded response to a bounded input


cWhich satisfies the conditions for a servo problem


dNone of these



Routh test_________________?


aCriterion provides information about the actual location of roots


bCannot be used to test the stability of a control system containing transportation lag


cCriterion is not applicable to systems with polynomial characteristic equation


dCannot determine as to how many roots of the characteristics equation have positive real roots



Thermodynamic Celsius scale of temperature measurement is________________?


aDefined on the basis of melting point of ice and evaporation temperature of water vapor


bDefined on the basis of melting point of ice and condensation temperature of water vapor


cHaving an interval of 100° between ice point to steam point


dBoth B. and C.


View Answer Both B. and C.

Bourdon gauges are used for measuring pressure (kg/cm2) ?


a< atmospheric


b> 2 (gauge)


c10 (absolute)


dNone of these


View Answer > 2 (gauge)

Radiation pyrometers as compared to thermocouples____________________?


aHas a slower speed of response


bCan measure higher temperature


cCan’t measure the temperature of moving objects


dIs more affected by corrosive atmosphere



Number of poles in a system with transfer function 1/(s2 + 2s2 + 1) is ________________?


a2


b5


c3


d1


View Answer 3

Thermocouple in a thermal well behaves as a true ________________?


aFirst order system


bSecond order system (overdamped)


cMultiple first order system


dSecond order system (underdamped)



Stability of a control system containing a transportation lag can be best analysed by_______________?


aRouth test


bRoot locus methods


cFrequency response methods


dNone of these



Accurate temperature measurement performance of a radiation pyrometer cannot be affected, if the ?


aEnhancement or attenuation of radiation occurs in the sighting path


bObject and surrounding are at almost the same temperature


cObject has varying emissivity


dObject is transparent



The open loop transfer function of a process is K [{(s + 1) (s + 4)}/{(s + 2) (s + 3)}]. In the root locus diagram, the poles will be at ___________________?


a-1, -4


b1, 4


c-2, -3


d2, 3


View Answer -2, -3

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