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GATE ECE 2004 | Question: 67

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A system has poles at $0.01 \mathrm{~Hz}, 1 \mathrm{~Hz}$ and $80 \mathrm{~Hz}$; zeros at $5 \mathrm{~Hz}, 100 \mathrm{~Hz}$ and $200 \mathrm{~Hz}$. The approximate phase of the system response at $20 \mathrm{~Hz}$ is

  1. $-90^{\circ}$
  2. $0^{\circ}$
  3. $90^{\circ}$
  4. $-180^{\circ}$

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