Process Control and Instrumentation In a feed-back control system G and H denote open loop and close loop transfer functions respectively. The output-input relationship is H/G G/H H(1 + G) G/(1 + H) H/G G/H H(1 + G) G/(1 + H) ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation 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 2 4 1 3 2 4 1 3 ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation A first order system with unity gain and time constant τ is subjected to a sinusoidal input of frequency w = 1/τ. The amplitude ratio for this system is 1/√2 0.25 1 0.5 1/√2 0.25 1 0.5 ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation For an input forcing function, X(t) = 2t², the Laplace transform of this function is 2/s³ 2/s² 4/s² 4/s³ 2/s³ 2/s² 4/s² 4/s³ ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation The characteristic equation for the control system with a closed loop transfer function G₁/1 + G₂ is given by 1 + G₂ = 0. The characteristic equation for the control system Determines its stability All of these Is the same for set point or load changes Depends only upon the open loop transfer function Determines its stability All of these Is the same for set point or load changes Depends only upon the open loop transfer function ANSWER DOWNLOAD EXAMIANS APP
Process Control and Instrumentation Stabilising time for the controllers is the time required for the response to reach __________ percent of its ultimate value. 95 63.2 87.5 100 95 63.2 87.5 100 ANSWER DOWNLOAD EXAMIANS APP