Q.

A system has poles at 0.01 Hz, 1 Hz and 80Hz, zeroes at 5Hz, 100Hz and 200Hz. The approximate phase of the system response at 20 Hz is :

A. -90°
B.
C. 90°
D. -180°
Answer» A. -90°
Explanation: pole at 0.01 hz gives -180° phase. zero at 5hz gives 90° phase therefore at 20hz -90° phase shift is provided.
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