Multiple choice technology testing

DTMF stands for

  1. Dual tune multi frequency

  2. Dual tone multi frequency

  3. Dual twist multi frequency

  4. Double Tone multi frequency
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

DTMF (Dual Tone Multi Frequency) is the signaling system used in telephones where each key press generates two simultaneous tones. This allows telephony systems to identify which key was pressed. The correct expansion is Dual Tone Multi Frequency, not tune/twist.

AI explanation

DTMF stands for Dual Tone Multi Frequency — the signaling system used by touch-tone telephones, where each key press generates a combination of two specific audio frequencies that the receiving system decodes to identify the digit pressed. This is the correct, standard telecommunications term. "Dual tune multi frequency," "Dual twist multi frequency," and "Double Tone multi frequency" are all incorrect variations/misspellings of the real term — none of them are the accepted industry expansion of the DTMF acronym.

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