Project ForgeInstrumentation & Process Control
Controller Modes
GATE 2018
Medium
For a closed loop with Gp=2/(7s+1), Gc=2, Gm=1, Gf=1, the offset due to a unit step change in the setpoint is
0.2(± 0.02 accepted)
Explanation
Overall loop gain at s=0: Gc·Gp(0)·Gm·Gf=2×2×1×1=4. Offset=ΔSP/(1+4)=1/5=0.2.
Source: GATE CH 2018 (2018)
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