Chemical Engineering MCQs

Page No. 403

A photo electric device in which the resistance of the metal is directly proportional to the light striking on it, is known as photo-conductive cell. Photoelectric transducers are used for the measurement of those parameters, which can be used to produce variation in_______________?


aLight intensity


bCurrent


cFlux density


dVoltage


View Answer Light intensity

The frequency response of a first order system, has a phase shift with lower and upper bounds given by________________?


a– ∞, π/2


b-π/2, π/2


c-π/2, 0


d0, π/2


View Answer 0, π/2

Which of the following does not figure in the list of seven substances selected for international temperature scale ?


aIce (F.P) and steam (B.P)


bOxygen and sulphur (B.P)


cAntimony and silver (F.P)


dZinc (B.P) and mercury (F.P)



Bode diagram are generated from output response of the system subjected to which of the following input ?


aImpulse


bImpulse


cRamp


dSinusoidal


View Answer Sinusoidal

In a single tank system, the transfer function of _____________ to inlet flow rate is 1/(TS+1)?


aOutlet flow rate


bLevel


cBoth A. & B.


dNeither A. nor B.


View Answer Outlet flow rate

Identify an unbounded input from inputs whose transfer functions are given below______________?


a1


b1/S


c1/S2


d1/(S2 + 1)


View Answer 1/S2

The transfer function of a first order system is______________?


a1/(Ts + 1)


b1/Ts


cs/(Ts + 1)


dNone of these


View Answer 1/(Ts + 1)

Find the ultimate gain and frequency for a proportional controller in the case of a process having the transfer function Gp(s) = 1/(4s + 1)(2s + 1)(s + 1) ?


aw = 1/√14, Kc = 45/7 √14


bw = √(7/6), Kc = 46/3


cw = 1, Kc = 13


dw = √(7/8), Kc = 45/4



Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by__________________?


aFilling nitrogen under pressure in the stem


bIncreasing the diameter of the tube


cUsing steel tube in place of glass tube


dAccounting for the tube expansion



The initial value (t = 0) of the unit step response of the transfer function [(s + 1)/(2s + 1)] is__________________?


a0


b½


c1


d2


View Answer ½

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