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Electrical and Controls Flashcards

7 cards from real NATE 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 and Controls flashcards as text

  1. What is the purpose of a defrost control board in a heat pump system?

    Answer: Initiate and terminate the defrost cycle based on time and temperature

    The defrost control board monitors time and outdoor coil temperature to initiate defrost and terminate it when the coil clears.

  2. Which NEC article governs the installation of HVAC equipment in commercial and residential applications?

    Answer: Article 440

    NEC Article 440 specifically covers air-conditioning and refrigerating equipment, including wiring, overcurrent protection, and disconnects.

  3. When measuring current with a clamp-on ammeter on a 240V single-phase circuit, which conductor should the clamp encircle?

    Answer: Only one hot conductor

    Clamping around a single hot conductor measures the full current in that leg of the circuit without cancellation.

  4. What does the term 'MCA' (Minimum Circuit Ampacity) indicate on an HVAC nameplate?

    Answer: Minimum wire ampacity required for branch circuit conductors

    MCA specifies the minimum ampacity that the branch circuit conductors must be rated to safely carry for the equipment.

  5. A technician finds a blown fuse in the control circuit. After replacing it, the fuse blows again immediately. What is the BEST next step?

    Answer: Check for short circuits or grounded wiring in the control circuit

    A repeatedly blown fuse indicates a short circuit or grounded wire in the control circuit that must be located and repaired.

  6. What is the typical voltage and frequency of the secondary side of an HVAC control transformer in the United States?

    Answer: 24V AC / 60Hz

    HVAC control transformers in the US typically output 24V AC at 60Hz to power the low-voltage control circuit.

  7. What safety device is required by NEC to be within sight of, or lockable from, an HVAC unit's location?

    Answer: Disconnect means

    NEC requires a disconnect means within sight of the HVAC unit or capable of being locked in the open position so technicians can safely de-energize the equipment.