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Applied Electrical Flashcards

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

Read the first 6 Applied Electrical flashcards as text

  1. What is the primary advantage of using aluminum conductors instead of copper in large feeder installations?

    Answer: Lower cost and lighter weight

    Aluminum is significantly cheaper and lighter than copper, making it practical for large feeder and service entrance cables despite requiring larger wire sizes for equivalent ampacity.

  2. When performing a voltage drop calculation, what is the maximum recommended voltage drop for branch circuits per NEC recommendations?

    Answer: 3%

    The NEC recommends a maximum 3% voltage drop for branch circuits and 5% total for the combined feeder and branch circuit, though these are recommendations rather than mandatory requirements.

  3. Which type of conduit is most suitable for direct burial applications without concrete encasement?

    Answer: PVC Schedule 80

    PVC Schedule 80 conduit is designed for direct burial and harsh environments, offering excellent corrosion resistance and physical strength without requiring concrete encasement.

  4. What happens to capacitance when two capacitors are connected in parallel?

    Answer: Total capacitance is the sum of individual capacitances

    Capacitors in parallel add directly: C_total = C1 + C2. This is opposite to resistors, where series values add directly.

  5. What is the standard color for a grounded conductor (neutral) in the United States?

    Answer: White or gray

    Per NEC Article 200.6, grounded conductors (neutrals) must be identified by white or gray color, or by three continuous white or gray stripes on other-than-green insulation.

  6. What is the purpose of a disconnect switch near an HVAC condensing unit?

    Answer: To provide a visible means of disconnection for safe servicing

    NEC Article 440.14 requires a disconnecting means within sight of and readily accessible from the HVAC equipment, allowing technicians to safely de-energize the unit before servicing.