Which unit is used to express the signal-to-nose ratio?

Question

Options

• Amw
• Bamp
• Cdb
• Ddbm

• A
  3% (1)
• B
  3% (1)
• C
  94% (32)

Explanation

Signal-to-Noise Ratio (SNR) and Decibels (dB)

Signal-to-noise ratio (SNR) is expressed in decibels (dB), making option C correct, because dB is a logarithmic unit that effectively represents the ratio between two values - in this case, the power of a desired signal versus background noise. Option A (mW) is incorrect because milliwatts measure absolute power, not a ratio. Option B (amp) is wrong because amperes measure electrical current, which is unrelated to signal quality comparisons. Option D (dBm) is close but incorrect - while dBm is also logarithmic, it measures absolute power referenced to 1 milliwatt, not a ratio between two signals.

Memory Tip: Think of the "ratio" in signal-to-noise ratio - ratios are comparisons, and dB compares two values on a log scale. If you see "dBm," remember the "m" anchors it to milliwatts (absolute), while plain "dB" floats freely as a pure ratio.

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