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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. | 0° |
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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