Practice Test Geeks(EMP) Energy Management Professional Practice Test
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Energy Audits Flashcards

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

Read the first 7 Energy Audits flashcards as text

  1. The International Performance Measurement and Verification Protocol (IPMVP) Option B involves:

    Answer: Continuously metering the energy conservation measure to measure all parameters

    IPMVP Option B (Retrofit Isolation with All Parameters Metered) continuously meters the ECM itself to capture actual performance of all parameters.

  2. A simple payback period calculation for an energy conservation measure (ECM) does NOT account for:

    Answer: Time value of money and future cash flows

    Simple payback divides capital cost by annual savings but ignores the time value of money, inflation, and savings that occur after payback is achieved, unlike NPV or IRR.

  3. When auditing a variable frequency drive (VFD) installation on a centrifugal pump, which law predicts the relationship between speed reduction and power savings?

    Answer: The Affinity Laws

    The Affinity Laws state that pump power varies with the cube of speed, so a 20% speed reduction yields approximately 49% power savings.

  4. An energy auditor finds that a large commercial building uses a constant-air-volume (CAV) HVAC system. The most energy-efficient upgrade recommendation would typically be to convert to:

    Answer: A variable air volume (VAV) system with VFDs on supply fans

    Converting CAV to VAV with VFDs allows fan speed to vary with load, achieving dramatic fan energy savings through the cubic relationship between speed and power.

  5. In energy auditing, what is a 'phantom load' or 'standby power' loss?

    Answer: Electricity drawn by equipment while switched off or in standby mode

    Phantom loads are the continuous electricity consumption of devices in standby mode (TVs, chargers, office equipment), which collectively can account for 5–10% of residential and commercial electricity use.

  6. Which metric is used to evaluate the energy efficiency of a chiller system during an energy audit?

    Answer: Coefficient of Performance (COP) or kW/ton

    Chiller efficiency is measured in COP (cooling output divided by electrical input) or kW/ton (electrical input per ton of cooling produced), with lower kW/ton values indicating better efficiency.

  7. During an energy audit, the auditor calculates a facility's 'load factor.' A low load factor typically indicates:

    Answer: The facility has a high peak demand relative to its average demand, suggesting demand management opportunities

    Load factor is the ratio of average demand to peak demand; a low value means peak demand is much higher than average, suggesting opportunities to shift or reduce peak loads to cut demand charges.