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Energy Efficiency and Sustainability Flashcards

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

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  1. Which metric specifically measures the ratio of IT equipment energy consumption to total facility energy consumption?

    Answer: Data Centre Infrastructure Efficiency (DCiE)

    DCiE (Data Centre Infrastructure Efficiency) is the reciprocal of PUE and expresses IT load as a percentage of total facility power, directly measuring the proportion of energy reaching IT equipment.

  2. A data centre is located near a cold climate region and uses outside air for cooling. What is this technique called?

    Answer: Economizer mode (free cooling)

    Economizer mode, also called free cooling, uses ambient outside air when temperatures are low enough to cool the data centre without mechanical refrigeration, significantly reducing cooling energy.

  3. What does the term 'stranded power' refer to in data centre capacity planning?

    Answer: Reserved power capacity not associated with active IT load

    Stranded power is reserved but unused power capacity—typically allocated to racks or zones but not consumed by IT equipment—reducing overall data centre efficiency.

  4. Which international standard provides a framework specifically for energy management systems applicable to data centres?

    Answer: ISO 50001

    ISO 50001 defines requirements for establishing, implementing, and maintaining an energy management system (EnMS), and is applicable to data centres seeking certified energy governance.

  5. A data centre operator wants to reduce PUE by optimizing airflow. Which of the following actions would be MOST effective?

    Answer: Implementing hot aisle/cold aisle containment

    Hot aisle/cold aisle containment prevents mixing of supply and return air, allowing cooling systems to operate more efficiently and directly lowering PUE.

  6. What is the primary purpose of a DCIM (Data Centre Infrastructure Management) tool in relation to energy efficiency?

    Answer: To provide real-time visibility into power and cooling consumption

    DCIM tools monitor power draw, thermal conditions, and capacity in real time, enabling operators to identify inefficiencies and optimize energy use across the facility.

  7. Which cooling strategy delivers cooled air directly to the server inlet within or adjacent to the rack, minimizing distribution losses?

    Answer: In-row cooling

    In-row cooling units are placed within server rows, delivering conditioned air directly to equipment inlets and reducing the distance cold air must travel, improving efficiency.