Why are frequency variations a small concern for data center managers?

Question

Options

• AFrequency variation helps server performance.
• BComputer power supplies are frequency tolerant.
• CFrequency variation is strictly a theoretical problem.
• DFrequency variation occurs during sag conditions, which the UPS resolves.

• A
  11% (2)
• B
  78% (14)
• C
  6% (1)
• D
  6% (1)

Explanation

Modern computer power supplies are designed to operate across a wide range of input frequencies, typically accepting anywhere from 50 Hz to 60 Hz (and sometimes beyond), which means minor fluctuations in grid frequency have little to no impact on equipment operation - this is why option B is correct. Option A is wrong because frequency variation does not help performance; it is a power quality problem, not a benefit. Option C is incorrect because frequency variation is a real phenomenon that occurs on power grids, particularly during periods of high load or generation imbalance. Option D confuses two distinct power issues: sags are voltage drops, not frequency events, and while a UPS does address certain power anomalies, frequency tolerance is an inherent hardware characteristic of the power supply itself, not something a UPS specifically resolves in this context.

Memory tip: Think of a power supply as a bilingual adapter - it speaks both 50 Hz and 60 Hz fluently, so small accents (variations) in the signal do not throw it off.

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