Discussion
Given below are two statements :
Statement I : The phase lag network allow to pass high frequencies and low frequencies are attenuated.
Statement II : The steady state accuracy can be improved by using phase lead network.
In the light of the above statements, choose the most appropriate answer from the options given below.
Answer: A
Both Statement I and Statement II are false.
Statement I is false: a phase lag network behaves as a low-pass filter. It passes low frequencies and attenuates high frequencies, which is the reverse of what the statement says.
Statement II is false: steady-state accuracy is improved by the lag network, which raises the low-frequency gain and so reduces the steady-state error. A phase lead network improves the transient response, increasing bandwidth and speed of response, not the steady-state accuracy. Since both statements are wrong, every option calling either one true is ruled out.
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