Electronics Engineering Circuit Assignment Questions: Theory & AC Analysis, Singapore

(i) Find the node voltages v₁, v₂, v₃ in the circuit given in Figure Q1. (12 marks)

(ii) Find the power absorbed/delivered by the dependent current source. (3 marks)

Question 2:

(i) Find Thevenin’s equivalent between the nodes A and B in the circuit given in Figure Q2. (12 marks)

(ii) Determine the maximum power that can be drawn from the circuit by connecting a resistor between nodes A and B. (3 marks)

Question 3:

The switch S in circuit shown in the Figure Q3 was open for a long time before being closed at t=0. Find the expression for capacitor voltage, v_c(t) after the switch is closed.

(10 marks)

Question 4:

Using Superposition principle, find the current I in the circuit shown in Figure Q4.

(10 marks)

Question 5:

The load shown in Figure Q5 is connected to a 220 V, 50 Hz source. [R= 100Ω, L= 0.01 H and C= 500 μF].

Question 6:

A practical coil modeled as Z_coil = R_c+jX_L is connected in series with a purely resistive element R = 40 Ω. An AC source of 220 V, 50 Hz is connected across the series circuit. The RMS voltage measured across R is 90 V and measured across Z_coil is 140 V.

Question 7:

In the circuit shown Figure Q7, transformer turns ratio is N₁:N₂ = 5:1. The supply voltage is 240 V, 50 Hz. The components are R₁ = 10 Ω, R₂ = 10 Ω, and Z=j10 Ω. Determine the primary current and the secondary voltage.

(12 marks)

Question 8:

You have to design a DC-power supply to provide 1 A current to a 12 Ω load. The mains power supply is 240 V, 50 Hz AC. It is desired to have voltage ripple less than 1% of load voltage. Assume all components used are ideal.