BEE BEE Bachelor of Electrical Engineering Electric Circuit Analysis Questions and Answers 2

Question 1

A 10 V source is connected across two parallel resistors of 4 Ω and 12 Ω. What is the total current supplied by the source?

Accepted Answer

3.33 A

Answer

The parallel combination is (4×12)/(4+12) = 3 Ω, so I = 10/3 ≈ 3.33 A.

Question 2

In a series RLC circuit at resonance, what is the impedance equal to?

Accepted Answer

R only

Answer

At resonance the inductive and capacitive reactances cancel, leaving only the resistance R.

Question 3

What is the time constant of a series RC circuit with R = 2 kΩ and C = 50 μF?

Accepted Answer

0.1 s

Answer

τ = RC = 2000 × 50×10⁻⁶ = 0.1 seconds.

Question 4

Using the superposition theorem, how are the individual source contributions combined to find the total response?

Accepted Answer

Algebraically added

Answer

Superposition states that the total response is the algebraic sum of responses due to each independent source acting alone.

Question 5

A node in a circuit has three branches carrying currents of 5 A (in), 3 A (out), and I (out). By KCL, what is I?

Accepted Answer

2 A

Answer

By Kirchhoff's Current Law, currents entering equal currents leaving: 5 = 3 + I, so I = 2 A.

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