General exam question G5B10
Subelement G5, ELECTRICAL PRINCIPLES· Group G5B
G5B10
What percentage of power loss is equivalent to a loss of 1 dB?
- A.10.9 percent
- B.12.2 percent
- C.20.6 percent (correct answer)
- D.25.9 percent
WhyA loss of 1 dB is equivalent to a power loss of about 20.6 percent. A 1 dB loss corresponds to a power ratio of 10^(-1/10), which works out to about 0.794, meaning about 79.4 percent of the power remains and the other 20.6 percent has been lost, answer C. The other percentages don't match the power ratio that a 1 dB change actually represents.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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