Process Control and Instrumentation For a feed back control system to be stable, the Poles of the closed loop transfer function should lie in the right half of the complex plane Bode plots of the corresponding open loop transfer function should monotoni-cally decrease Roots of the characteristic equation should be real Poles of the closed loop transfer function should lie in the left half of the complex plane Poles of the closed loop transfer function should lie in the right half of the complex plane Bode plots of the corresponding open loop transfer function should monotoni-cally decrease Roots of the characteristic equation should be real Poles of the closed loop transfer function should lie in the left half of the complex plane ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The open loop transfer function of a control system is KR/(1 + TS) . This represents A first order time lag A second order system A first order system Dead time system A first order time lag A second order system A first order system Dead time system ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation A proportional controller with a gain of Kc is used to control a first order process. The offset will increase, if Kc is reduced Derivative control action is introduced Integral control action is introduced Kc is increased Kc is reduced Derivative control action is introduced Integral control action is introduced Kc is increased ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation 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 π/3 π/6 π/12 5π/12 π/3 π/6 π/12 5π/12 ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Thermal conductivity based continuous flue gas analyser makes use of varying thermal conductivity of the constituents of flue gases. Which of the following constituents of flue gases has the maximum thermal conductivity? N₂ CO O₂ CO₂ N₂ CO O₂ CO₂ ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Dead zone is the Same as time constant Maximum change in the variable that does not change the reading of the instrument None of these Same as transportation lag Same as time constant Maximum change in the variable that does not change the reading of the instrument None of these Same as transportation lag ANSWER DOWNLOAD EXAMIANS APP
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