CDCP MCQ 3 — Questions and Answers
Question 1: Which type of UPS topology provides the highest level of power protection by always running the load through the inverter?
- Standby (offline) UPS
- Line-interactive UPS
- Double-conversion (online) UPS (Correct answer)
- Delta conversion UPS
Correct answer: Double-conversion (online) UPS
Double-conversion UPS continuously converts AC to DC and back to AC, completely isolating the load from utility power anomalies.
Question 2: What is the purpose of a raised floor in a traditional data centre?
- To provide additional structural support for heavy servers
- To distribute conditioned air to equipment through perforated tiles (Correct answer)
- To route high-voltage electrical cables safely
- To prevent vibration from reaching sensitive equipment
Correct answer: To distribute conditioned air to equipment through perforated tiles
Raised floors create a plenum space through which cooled air is distributed and delivered upward through perforated floor tiles.
Question 3: In the context of data centre power distribution, what does PDU stand for?
- Power Delivery Unit
- Power Distribution Unit (Correct answer)
- Primary Data Utility
- Protected Device Uplink
Correct answer: Power Distribution Unit
A PDU (Power Distribution Unit) distributes electrical power from a source to multiple IT equipment loads within a rack or room.
Question 4: Which fire suppression system is most commonly preferred in data centres due to minimal equipment damage?
- Water sprinkler systems
- Dry chemical powder systems
- Clean agent gaseous suppression (e.g., FM-200) (Correct answer)
- Foam deluge systems
Correct answer: Clean agent gaseous suppression (e.g., FM-200)
Clean agent systems suppress fire using gases like FM-200 or Novec 1230 that leave no residue and don't damage sensitive electronics.
Question 5: What metric measures the proportion of water used for cooling that is actually evaporated into the atmosphere?
- WUE (Water Usage Effectiveness) (Correct answer)
- CUE (Carbon Usage Effectiveness)
- ERE (Energy Reuse Effectiveness)
- DCiE (Data Centre Infrastructure Efficiency)
Correct answer: WUE (Water Usage Effectiveness)
WUE (Water Usage Effectiveness) = Annual Site Water Usage ÷ IT Equipment Energy, measuring how much water is consumed per unit of IT work.
Question 6: A data centre with 2N power redundancy has a critical load of 800 kW. What is the total installed UPS capacity?
- 800 kW
- 1,200 kW
- 1,600 kW (Correct answer)
- 2,400 kW
Correct answer: 1,600 kW
2N redundancy means two complete independent systems each capable of supporting 100% of the load: 2 × 800 kW = 1,600 kW total.
Question 7: Which standard provides guidelines for the design and construction of data centre infrastructure and is widely used in the US?
- ISO 27001
- TIA-942 (Correct answer)
- EN 50600
- BICSI 002
Correct answer: TIA-942
TIA-942 (Telecommunications Infrastructure Standard for Data Centers) defines requirements for data centre infrastructure with four rated tiers.
CDCP MCQ 3
Which type of UPS topology provides the highest level of power protection by always running the load through the inverter?