Ece 203 electrical circuit (1)

YILDIRIM BEYAZIT UNIVERSITY ELECTRICAL CIRCUITS 2 TAKE HOME EXAM 1 1) Select the values of R1, R2 and R3 in the circuit in figure below so that h 11 = 4Ω, h12 = 0.8, h21 = -0.8 and h22 = 0.14 S.

2) The z and y parameters for the resistive two-ports in the figure below are given by; z11 = 35/3 Ω, z12 = -100/3 Ω, z21 = 4/3 kΩ, z22 = 10/3 kΩ; y11 = 200 μS, y12 = 40 μS, y21 = -800 μS, y22 = 40 μS. Calculate Vo if Vin = 30 mV DC.

3) Find the h parameters of the two-port circuit shown in the figure below.

4)

a) For the circuit shown below, find the frequency (in radians per second) at which the impedance Zab is purely resistive, b) Find the value of Zab at the frequency of (a).

5) Find the impedance Zab (impedance) in the circuit seen in the figure below. Express Zab in both polar and rectangular forms.

6) Find the value of Z in the circuit seen in the figure below, if Vg = 100 - /50 V, Ig = 30 + /20 A, and V1 = 140 + /30 V.

7) Find the Thevenin equivalent circuit with respect to the terminals a, b for the circuit shown in the figure below.

8) The op amp in the circuit shown in the figure below is ideal. Calculate the average power delivered to the 1 k Ί resistor if Vin = cos1000t Volts.

9) Find the rms value of the periodic current shown in the graph below.

10)

a) Determine the load impedance for the circuit shown in the figure below that will result in maximum average power being transferred to the load if ω = 5 krad/s. b) Determine the maximum average power delivered to the load from part (a) if Vin = 80 cos(5000t) Volts.

11) The three loads in the circuit shown in the figure below are S1 = 5 + j1.25 kVA, S2 = 6.25 + j2.5 kVA, and S3 = 8 + j0 kVA. a) Calculate the complex power associated with each voltage source, V g1 and Vg2. b) Verify that the total real and reactive power delivered by the sources equals the total real and reactive power absorbed by the network.

12) Find the average power delivered by the ideal current source in the circuit in figure below if ig=4cos(5000t) mA.