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Electrical Systems & Wiring Flashcards

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

Read the first 7 Electrical Systems & Wiring flashcards as text

  1. Which type of transformer connection is most commonly used to step down 480V three-phase service to 120/208V for classroom power distribution?

    Answer: Delta-Wye

    A Delta-Wye transformer steps 480V delta primary down to a 120/208V wye secondary, providing both single-phase 120V and three-phase 208V outlets.

  2. A CTE teacher is instructing students on motor nameplate data. If a motor is rated 1.5 HP, 120V, with 80% efficiency, what is the approximate input power draw?

    Answer: 1119W

    Output = 1.5 HP × 746W/HP = 1119W; at 80% efficiency, input = 1119W ÷ 0.80 = 1399W ≈ 1119W output.

  3. What is the purpose of a neutral bar bonding strap in a main service panel, and should it be installed in a sub-panel?

    Answer: It bonds neutral to ground; no, removed in sub-panels

    The neutral-ground bond must occur only at the main panel; sub-panels must have separate neutral and ground bars to prevent parallel neutral paths.

  4. Students are learning about conductor color coding. In a 240V/120V single-phase system, which color identifies the second ungrounded (hot) conductor?

    Answer: Red

    Red identifies the second hot conductor in single-phase 120/240V systems, while black is the first hot.

  5. When troubleshooting a tripping GFCI outlet, a student finds that downstream outlets on the same circuit also lose power. What is the correct explanation to give?

    Answer: GFCI outlets protect downstream devices through their LOAD terminals

    A GFCI outlet's LOAD terminals extend ground-fault protection to all downstream devices wired through it, so one GFCI can protect multiple outlets.

  6. In a CTE program teaching residential wiring, the NEC requires that in a kitchen, small appliance branch circuits must supply how many minimum circuits?

    Answer: Two 20A circuits

    NEC 210.11(C)(1) requires a minimum of two 20A small-appliance branch circuits for kitchen countertop receptacles.

  7. A student observes that a three-way switch circuit does not function correctly with the existing wiring. Which conductors serve as 'travelers' in a standard three-way switch circuit?

    Answer: The two wires connecting the two three-way switches together

    Travelers are the two conductors running between the two three-way switches; the switches alternate which traveler carries current.