10 The system with frequency response H(w) = 3+ to x (t) = 20 cos (2t +) is: O 1. y(t) = 40 cos(2t +-tan-¹()) ○ 2. y(t) = 200 cos (2t +++ tan ¹) y(t) = 200 cos(3t+-tan- (-¹)) O 3. ○ 4. y(t) = 40 cos (2t +/- tan ¹()) O 5. None of the answers

Q4. a) b) Figure 7 shows a phase-shift oscillator. Explain briefly how the phase shift required for sustained oscillation is achieved in this circuit. The feedback ratio of the oscillator shown in Figure 7 is given below. Derive the expression for the oscillation frequency of this circuit. c) 5 -1 1 6 — 27 pe) —i (2fe – (27) :) 2fRC - If the oscillator of Figure 7 is required to operate at 2 kHz, determine the value of the remaining resistors if R₁ = 80 kn and C = 12 nF.

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