A first order system with a time constant of 1 min is subjected to frequency response analysis. At an input frequency of 1 radian/min, the phase shift is______________?
Correct answer: D. -45°
- A. 45°
- B. -90°
- C. -180°
- D. -45°
Explanation
For a first-order system, the phase angle is -tan⁻¹(ωτ). Here ωτ = 1 × 1 = 1, giving a phase shift of -tan⁻¹(1) = -45°.
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