Practice Test GeeksCDCS - Certified Data Center Specialist Practice Test
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CDCS Power & Cooling Systems Flashcards

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

Read the first 6 CDCS Power & Cooling Systems flashcards as text

  1. What is the ASHRAE A1 thermal envelope recommended inlet temperature range for most enterprise IT equipment?

    Answer: 59°F–89.6°F (15°C–32°C)

    ASHRAE A1 class specifies an allowable inlet temperature range of 59°F to 89.6°F (15°C to 32°C) for standard enterprise servers and storage equipment.

  2. Which cooling technology uses water-chilled rear-door heat exchangers attached directly to server cabinets?

    Answer: Rear-door heat exchanger (RDHx)

    Rear-door heat exchangers (RDHx) mount directly on the back of server racks, capturing hot exhaust air at the source and transferring heat to chilled water before it enters the room.

  3. What does N+1 redundancy mean in the context of data center UPS systems?

    Answer: One additional UPS module beyond the minimum required for full load

    N+1 redundancy means one extra capacity unit beyond the minimum (N) needed to support the full load, so the system tolerates one unit failure without losing capacity.

  4. What is the primary advantage of using a hot-aisle containment (HAC) system over cold-aisle containment (CAC)?

    Answer: HAC keeps the general room air cooler and safer for personnel

    Hot-aisle containment captures exhaust heat directly at the hot aisle and routes it to cooling units, so the ambient room temperature remains at a comfortable level for personnel working outside containment.

  5. Which metric describes the percentage of time a data center's power infrastructure is expected to be available per year?

    Answer: Uptime percentage (nines)

    Availability is expressed as uptime percentage (e.g., 99.9999% = six nines), which correlates to Uptime Institute tier classifications for annual downtime tolerance.

  6. What is the function of a static VAR compensator (SVC) or active harmonic filter in a data center electrical system?

    Answer: Mitigate harmonic distortion generated by non-linear IT loads

    Active harmonic filters inject corrective currents that cancel the harmonics produced by non-linear IT equipment loads, reducing total harmonic distortion (THD) and protecting electrical infrastructure.

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