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CME Power Quality & Energy Efficiency Flashcards

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

Read the first 6 CME Power Quality & Energy Efficiency flashcards as text

  1. What is the purpose of demand-side management (DSM) programs offered by electric utilities to commercial facilities?

    Answer: Reduce peak demand to lower utility infrastructure costs and provide incentives to customers

    DSM programs incentivize customers to shift or reduce energy use during peak periods, lowering the utility's generation and transmission costs while reducing customer demand charges.

  2. Which NEC article governs the installation of energy storage systems (ESS) such as battery backup systems in commercial buildings?

    Answer: NEC Article 706

    NEC Article 706 specifically covers energy storage systems including battery-based systems, defining installation requirements for stationary storage.

  3. A facility operates 500 kW of load for 12 hours at night and 1,200 kW for 12 hours during the day. What is the daily load factor?

    Answer: 0.708

    Load factor = average demand / peak demand = [(500×12 + 1200×12)/24] / 1200 = 850/1200 ≈ 0.708.

  4. Which type of automatic transfer switch (ATS) minimizes the interruption window when switching between utility and generator power?

    Answer: Closed-transition (make-before-break) ATS

    A closed-transition ATS briefly parallels utility and generator before disconnecting the utility, reducing transfer time to near zero for sensitive loads.

  5. What is the maximum voltage drop recommended by NEC 215.2(A)(4) for feeder circuits to optimize energy efficiency?

    Answer: 3%

    NEC 215.2(A)(4) recommends feeder voltage drop not exceed 3% (with a combined branch and feeder total not exceeding 5%) for energy efficiency.

  6. Which instrument measures power quality parameters including voltage, current, THD, power factor, and harmonics simultaneously?

    Answer: Power quality analyzer

    A power quality analyzer (e.g., Fluke 435) captures waveform data, computes harmonic spectra, measures power factor, and logs disturbance events for comprehensive analysis.