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Fundamental Circuit Analysis Flashcards

7 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 delta (Δ) network has resistors R_AB = 30 Ω, R_BC = 30 Ω, R_CA = 30 Ω. What is the equivalent star (Y) resistance at each node?

    Answer: 10 Ω

    For a balanced delta, R_Y = R_Δ / 3 = 30 / 3 = 10 Ω at each node.

  2. If the frequency of an AC source doubles, the inductive reactance X_L:

    Answer: Doubles

    X_L = 2πfL, so X_L is directly proportional to frequency — doubling f doubles X_L.

  3. In a circuit, a dependent voltage source whose value is controlled by a current elsewhere is called a:

    Answer: Current-controlled voltage source (CCVS)

    A CCVS (transresistance source) produces a voltage proportional to a controlling current in another branch.

  4. What is the resonant frequency of a series RLC circuit with L = 10 mH and C = 40 µF?

    Answer: 251.6 Hz

    f_0 = 1/(2π√LC) = 1/(2π√(0.01×40×10⁻⁶)) = 1/(2π×0.000632) ≈ 251.6 Hz.

  5. When applying the current divider rule, the current through branch R1 in a parallel circuit is:

    Answer: I_total × R2/(R1+R2)

    The current divider gives I_R1 = I_total × R2/(R1+R2) — the branch with lower resistance carries more current.

  6. An ideal voltage source has:

    Answer: Zero internal resistance

    An ideal voltage source has zero internal resistance, maintaining constant terminal voltage regardless of load current.

  7. The power factor of a circuit carrying 10 A from a 120 V source while consuming 900 W of real power is:

    Answer: 0.75

    PF = P / (V × I) = 900 / (120 × 10) = 900 / 1200 = 0.75.