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

Question 1

A 10V source is connected across two parallel resistors of 20Ω and 30Ω. What is the total current drawn from the source?

Accepted Answer

0.833 A

Answer

The parallel combination is (20×30)/(20+30) = 12Ω, so I = 10/12 ≈ 0.833 A.

Question 2

In a series RLC circuit at resonance, which statement is true?

Accepted Answer

The impedance is purely resistive and at its minimum value

Answer

At series resonance, inductive and capacitive reactances cancel, leaving only resistance as the impedance.

Question 3

What is the time constant of a series RC circuit with R = 4.7 kΩ and C = 22 μF?

Accepted Answer

103.4 ms

Answer

τ = RC = 4700 × 22×10⁻⁶ = 0.1034 s = 103.4 ms.

Question 4

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

Accepted Answer

By algebraically adding the individual responses

Answer

Superposition states that the total response in a linear circuit equals 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 3 A (in), 5 A (in), and I (out). What is I?

Accepted Answer

8 A

Answer

By Kirchhoff's Current Law, currents entering a node equal currents leaving, so I = 3 + 5 = 8 A.

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