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FREE Bachelor of Electrical Engineering Electric Circuits Questions and Answers Flashcards

6 cards from real BEE practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. A 10 V source is connected across two parallel resistors of 4 ohms and 12 ohms. What is the total current drawn from the source?

    Answer: 3.33 A

    The equivalent resistance is (4×12)/(4+12) = 3 ohms, so I = 10/3 = 3.33 A.

  2. In a series RLC circuit at resonance, which of the following is true?

    Answer: The impedance is purely resistive

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

  3. What is the time constant of a series RC circuit with R = 2 k-ohms and C = 50 microfarads?

    Answer: 0.1 seconds

    The time constant tau = RC = 2000 × 50×10^-6 = 0.1 seconds.

  4. A node in an electric circuit has three currents: 5 A entering, 3 A entering, and one unknown current leaving. What is the unknown current?

    Answer: 8 A leaving

    By Kirchhoff's Current Law, the sum of currents entering equals currents leaving, so the unknown current is 5 + 3 = 8 A.

  5. What is the maximum power transfer condition for a DC circuit with a source resistance of 50 ohms?

    Answer: Load resistance equals 50 ohms

    Maximum power is transferred when the load resistance equals the source resistance.

  6. A capacitor of 100 microfarads is charged to 20 V. What is the energy stored in the capacitor?

    Answer: 0.02 J

    Energy = 0.5 × C × V^2 = 0.5 × 100×10^-6 × 400 = 0.02 J.