BEE BEE Bachelor of Electrical Engineering Electric Circuit Analysis Questions and Answers 2 — Questions and Answers
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?
- 3.33 A (Correct answer)
- 2.50 A
- 1.67 A
- 4.00 A
Correct answer: 3.33 A
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?
- R only (Correct answer)
- R + jωL
- 1/(jωC)
- Zero
Correct answer: R only
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?
- 0.1 s (Correct answer)
- 0.01 s
- 1.0 s
- 0.5 s
Correct answer: 0.1 s
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?
- Algebraically added (Correct answer)
- Multiplied together
- Averaged
- Subtracted from the largest
Correct answer: Algebraically added
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?
- 2 A (Correct answer)
- 5 A
- 8 A
- 3 A
Correct answer: 2 A
By Kirchhoff's Current Law, currents entering equal currents leaving: 5 = 3 + I, so I = 2 A.
Question 6: What is the maximum power transfer condition for a DC circuit with source resistance Rs?
- Load resistance equals Rs (Correct answer)
- Load resistance is twice Rs
- Load resistance is zero
- Load resistance is infinite
Correct answer: Load resistance equals Rs
Maximum power is delivered to the load when the load resistance equals the source resistance.
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?