Ee 081 spring 2017 sample exam for the circuit shown it

Question

Part A -

Problem 1: For the given circuit, Find v_c(t) for t > 0.

Problem 2: Given v₁(t), v₂(t) and v₃(t). Find v_f(t). If v_f(t) = v₁(t) + v₂(t) + v₃(t)

v₁(t) = 40 cos(60t - 30)

v₂(t) =  60 cos(60t + 45)

v₃(t) = 90 sin(60t - 75)

Problem 3: For the given circuit, find v_a(t).

Problem 4: For the circuit shown i(t) = 1.25(5t - 15^o)A (RMS)

a) What is the value of the complete power? Association with the source if R = 20Ω & L = 3H?

b) What answer the values of R & L if the power Association with te source is: S = 16.57∠45^o?

Part B -

Problem 1: For the given circuit find v_c(t) & v_s(t) for t > 0.

Problem 2: For the given circuit find i.

Problem 3: For the given circuit find I_o.