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/12 5π/12 π/6 π/3 π/12 5π/12 π/6 π/3 ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The time constant of a first order process with resistance R and capacitance C is RC R + C 1/RC R - C RC R + C 1/RC R - C ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The inverse Laplace transform of the function f(s) = 1/S(1 + S) is 1 + et 1 - et 1 - e-t 1 + e-t 1 + et 1 - et 1 - e-t 1 + e-t ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Temperature control of an exothermic chemical reaction taking place in a CSTR is done with the help of cooling water flowing in a jacket around the reactor. The types of valve and controller action to be recommended are Air to open valve with the controller direct acting Air to open valve with the controller indirect acting Air to close valve with the controller direct acting Air to close valve with the controller indirect acting Air to open valve with the controller direct acting Air to open valve with the controller indirect acting Air to close valve with the controller direct acting Air to close valve with the controller indirect acting ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Which of the following is not a mechanical pressure sensing element? Bellows Bourdon tube U-tube Diaphragm Bellows Bourdon tube U-tube Diaphragm ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Phase lag of the frequency response of a second order system to a sinusoidal forcing function Is 30° Approaches 180° asymptotically Is 120° Is 90° at the most Is 30° Approaches 180° asymptotically Is 120° Is 90° at the most ANSWER DOWNLOAD EXAMIANS APP
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