Practice Test Geeks(EETC) Electrical Technician Certification Practice Test
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Circuit Theory Flashcards

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

Read the first 7 Circuit Theory flashcards as text

  1. In a series RLC circuit at resonance, what is the relationship between inductive reactance (XL) and capacitive reactance (XC)?

    Answer: XL = XC

    At resonance in a series RLC circuit, XL equals XC, causing them to cancel out and leaving only the resistance.

  2. A capacitor of 100 µF is connected to a 120V, 60Hz AC source. What is its capacitive reactance?

    Answer: 26.5 Ω

    XC = 1/(2πfC) = 1/(2π × 60 × 0.0001) ≈ 26.5 Ω.

  3. Which theorem states that any two-terminal linear network can be replaced by a single voltage source in series with an impedance?

    Answer: Thevenin's Theorem

    Thevenin's Theorem replaces a complex linear network with an equivalent voltage source (Vth) in series with an equivalent impedance (Zth).

  4. Two resistors of 6 Ω and 12 Ω are connected in parallel. What is their combined equivalent resistance?

    Answer: 4 Ω

    For parallel resistors: 1/Req = 1/6 + 1/12 = 3/12, so Req = 4 Ω.

  5. The time constant of an RL circuit is defined as the time for the current to reach what percentage of its final steady-state value?

    Answer: 63.2%

    One time constant (τ = L/R) is the time for current to reach approximately 63.2% of its final steady-state value.

  6. In a purely capacitive AC circuit, the current leads the voltage by how many degrees?

    Answer: 90°

    In a purely capacitive circuit, current leads voltage by 90° because the capacitor charges in response to applied voltage.

  7. What is the power factor of a purely inductive circuit?

    Answer: 0

    A purely inductive circuit has a power factor of 0 because the voltage and current are 90° out of phase, resulting in no real power consumed.