Process Control and Instrumentation
The offset introduced by proportional controller with gain Kc in response of first order system can be reduced by

None of these
Introducing integral control
Reducing value of Kc
Introducing derivative control

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Process Control and Instrumentation
Suppose that the gain, time constant and dead time of a process with the following transfer function:Gc(s) = 10 exp( - 0.1s)/(0.5s + 1) are known with a possible error of ± 20% of their values. The largest permissible gain Kc of a proportional controller needs to be calculated below taking the values of process gain, time constant and dead time as

8, 0.6, 0.08
12, 0.6, 0.12
12, 0.4, 0.08
8, 0.6, 0.12

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