What is the impulse response for the system indicated below? [Figure description: A unity negative-feedback block diagram. Input R(s) enters a summing junction (+ at input, - at feedback), followed by a block 1/Ts (T = time constant), whose output is C(s); the output C(s) is fed straight back (unity feedback) to the negative input of the summing junction.]
- A. (1/T) e^(-t/T) u(t)
- B. T e^(-Tt) u(t)
- C. (1/T) e^(-t/T)
- D. T e^(-Tt)
Answer: A. (1/T) e^(-t/T) u(t)
Explanation: C/R = (1/Ts)/(1+1/Ts) = 1/(Ts+1), so the impulse response is (1/T)e^(−t/T)u(t).