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MCQ 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.

Read the first 7 MCQ flashcards as text

  1. What is the primary advantage of using lithium-ion batteries over VRLA batteries in a data centre UPS?

    Answer: Longer lifespan and higher energy density with smaller footprint

    Lithium-ion batteries offer 2–3x longer service life, higher energy density, and significantly smaller footprint compared to VRLA alternatives.

  2. In data centre physical security, what is a mantrap (or airlock)?

    Answer: A small room with two interlocking doors where only one can open at a time

    A mantrap is a physical security vestibule with two doors where the first must close before the second opens, preventing tailgating.

  3. Which power factor value indicates that all electrical power drawn from the utility is being converted to useful work with no reactive component?

    Answer: 1.0

    A power factor of 1.0 (unity) means all apparent power (kVA) equals real power (kW) with zero reactive power wasted.

  4. What does the term 'stranded capacity' refer to in data centre operations?

    Answer: Power or cooling capacity that cannot be used due to imbalances or constraints

    Stranded capacity occurs when power or cooling limits are reached in one dimension while capacity remains available in another, preventing full utilization.

  5. In hot aisle/cold aisle arrangements, which direction do server fans typically push airflow?

    Answer: From cold aisle to hot aisle (front to back)

    Servers draw cool air in from the cold aisle (front) and exhaust hot air out the rear into the hot aisle.

  6. What is the role of a transfer switch (ATS/STS) in data centre power infrastructure?

    Answer: Automatically switching the load between two power sources upon failure

    An Automatic/Static Transfer Switch (ATS/STS) monitors both power feeds and transfers the load to the alternate source within milliseconds if the primary fails.

  7. Which environmental monitoring parameter is most critical to prevent electrostatic discharge (ESD) damage in a data centre?

    Answer: Relative humidity

    Low relative humidity increases static electricity buildup; ASHRAE recommends maintaining humidity above a dew point of 41.9°F (5.5°C) to control ESD risk.