SK0-004 · Question #445
A technician is selecting a UPS to use with a blade enclosure containing five blades with room for an additional seven blades. The blade enclosure is currently consuming 2500W of power, and each…
The correct answer is B. 4000W. With 5 blades currently using 2500W and 7 additional blades at 200W each, the fully loaded enclosure requires 3900W, so the minimum UPS that meets or exceeds this load is 4000W.
Question
A technician is selecting a UPS to use with a blade enclosure containing five blades with room for an additional seven blades. The blade enclosure is currently consuming 2500W of power, and each additional blade will need 200W of power. Assuming runtime to be less than a minute, which of the following is the MINIMUM amount of UPS wattage needed for the blade enclosure with all blades installed?
Options
- A3500W
- B4000W
- C4500W
- D5000W
How the community answered
(17 responses)- A12% (2)
- B82% (14)
- D6% (1)
Why each option
With 5 blades currently using 2500W and 7 additional blades at 200W each, the fully loaded enclosure requires 3900W, so the minimum UPS that meets or exceeds this load is 4000W.
3500W is less than the calculated 3900W maximum load, so this UPS would be undersized and could fail or shut down under full blade load.
The current draw is 2500W with 5 blades installed. Adding the remaining 7 blades at 200W each adds 1400W (7 x 200 = 1400), for a total of 3900W at full capacity. A UPS must be rated at or above the maximum load it will support, so the 3500W option is insufficient and the next available option, 4000W, is the minimum acceptable rating.
4500W exceeds the minimum requirement; while functional, it is not the minimum wattage needed and the question asks for the minimum.
5000W is well above the required 3900W and is not the minimum needed to support the fully populated blade enclosure.
Concept tested: UPS capacity sizing for full server load
Source: https://www.apc.com/us/en/faqs/FA157335/
Topics
Community Discussion
No community discussion yet for this question.