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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. When teaching students about capacitors in AC circuits, what happens to capacitive reactance (Xc) as frequency increases?

    Answer: Xc decreases

    Xc = 1 / (2πfC), so as frequency increases, capacitive reactance decreases, allowing more current to flow.

  2. A CTE instructor is explaining power factor to students. A motor draws 10A at 120V but only performs 960W of real work. What is the power factor?

    Answer: 0.8

    PF = Real Power / Apparent Power = 960W / (120V × 10A) = 960/1200 = 0.8.

  3. Which National Electrical Code article specifically addresses wiring methods and materials for services, feeders, and branch circuits in educational occupancies?

    Answer: NEC Article 518

    NEC Article 518 covers assembly occupancies including educational facilities, specifying wiring method requirements beyond general chapters.

  4. A student wiring a 240V baseboard heater circuit installs a double-pole breaker. Why is a double-pole breaker required rather than two single-pole breakers?

    Answer: Double-pole breakers trip both legs simultaneously, preventing a shock hazard from a single live leg

    A double-pole breaker mechanically links both trip mechanisms so that a fault on either hot leg simultaneously disconnects both legs, ensuring complete de-energization.

  5. In a CTE lab with fluorescent lighting using magnetic ballasts, students notice a 120Hz hum. What is the most likely cause?

    Answer: The ballast laminations vibrating at twice the line frequency

    Magnetic ballasts operate at 60Hz, and their core laminations vibrate at twice that frequency (120Hz), producing an audible hum.

  6. When teaching students about service entrance calculations, which load calculation method allows for a 40% demand factor on all connected lighting load above 3,000 VA for a dwelling unit?

    Answer: Standard calculation method (NEC 220.40–220.53)

    The standard calculation in NEC Table 220.42 applies a 35% demand factor to general lighting above 3,000 VA for dwelling units.

  7. A student is testing a receptacle with a multimeter and measures 120V between hot and neutral, 120V between hot and ground, but 5V between neutral and ground. What does this indicate?

    Answer: There is a high-resistance connection on the neutral conductor

    Voltage between neutral and ground indicates current flowing through a resistance on the neutral path — a loose or corroded neutral connection causing a voltage drop.