Chemical Engineering MCQs

Page No. 375

For the time domain function f(t) = t, the Laplace transform of ∫0 t f(t) dt is given by___________________?


a1/2 S3


b2/S3


c1/S3


d2/S2


View Answer 1/S3

Phase margin is equal to_______________?


a180° – phase lag


bPhase lag – 180°


cPhase lag + 180°


dPhase lag + 90°


View Answer 180° – phase lag

Continuous flue gas analyser makes use of paramagnetic properties of some of its constituents, which move towards the strongest part of the magnetic field thus displacing diamagnetic gases. Which of the following gases is diamagnetic ?


aCO2


bO2


cNO


dNO2


View Answer CO2

A non-linear chemical system is exemplified by a/an_________________?


aIsothermal CSTR


bMixer


cNon-isothermal CSTR


dNone of these


View Answer Non-isothermal CSTR

All the thermocouples used for temperature measurement use dissimilar metal ________________?


aStrips


bBars


cWires


dBeads


View Answer Wires

Dead zone is the__________________?


aSame as time constant


bSame as transportation lag


cMaximum change in the variable that does not change the reading of the instrument


dNone of these



The time constant of a unity gain, first order plus time delay process is 5 min. If the phase lag at a frequency of 0.2 rad/min is 60°, then the dead time (in minutes) is________________?


a5π/12


bπ/6


cπ/12


dπ/3


View Answer 5π/12

The transfer function for a P-D controller is________________?


aKc(1+ηD s)


bKc(1 +1/ηD s)


cKc ηD s


dKc/ηD s


View Answer Kc(1+ηD s)

Water is entering a storage tank at a temperature T0 and flow rate Q0 and leaving at a flow rate Q and temperature T. There are negligible heat losses in the tank. The area of cross-section of the tank is A0. The model that describes the dynamic variation of temperature of water in the tank with time is given as________________?


aQ0(T0 – T) = Ac . h (dT/dt)


bQ0T0 – QT = Ac . h (dT/dt)


cQ(T0 – T) = Ac . h (dT/dt)


dQ(T0 – T) = Ac . (dTH/dt)



The root locus plot of the roots of the characteristics equation of a closed loop system having the open loop transfer function K (s + 1)/[2 (2s + 1) (3s + 1)] will have a definite number of loci for variation of K from 0 to ∞. The number of loci is_______________?


a1


b2


c3


d4


View Answer 3

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