Practice Test Geeks(CAT) Commercial Audio Technician Practice Test
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Technical Skills Flashcards

7 cards from real CAT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Technical Skills flashcards as text

  1. What is the purpose of a delay line in a distributed audio system with multiple speaker zones?

    Answer: Synchronize audio with distant speakers to avoid echo

    Delay lines time-align audio signals so that sound from distant speakers arrives at listeners simultaneously with nearby speakers, preventing echo or comb filtering.

  2. In a 70V distributed speaker system, what is the advantage of using a step-down transformer at each speaker?

    Answer: It allows multiple speakers to be wired in parallel without impedance issues

    70V transformers allow many speakers to be wired in parallel on a single amplifier output while maintaining a manageable load impedance.

  3. What is 'feedback' in an audio system and what is its primary cause?

    Answer: A howling sound caused by a microphone picking up its own amplified output

    Acoustic feedback occurs when a microphone picks up sound from a speaker and re-amplifies it in a continuous loop, creating a howl or squeal.

  4. What does 'THD' measure in an audio amplifier?

    Answer: Total Harmonic Distortion

    Total Harmonic Distortion (THD) measures the ratio of harmonic overtones added by the amplifier to the original signal, expressed as a percentage.

  5. A commercial audio technician is troubleshooting a 60 Hz hum in a system. What is the most likely cause?

    Answer: Ground loop between two pieces of equipment

    A 60 Hz hum (matching AC power frequency in the US) is a classic symptom of a ground loop caused by multiple ground paths between equipment.

  6. What is the recommended dB level for nominal line-level signals in professional (+4 dBu) audio equipment?

    Answer: +4 dBu

    +4 dBu (approximately 1.23V RMS) is the standard nominal operating level for professional balanced audio equipment.

  7. Which amplifier class is most commonly used in high-efficiency commercial audio amplifiers due to its ability to switch between output states?

    Answer: Class D

    Class D amplifiers use pulse-width modulation switching to achieve efficiencies above 90%, making them ideal for commercial installs where heat and power consumption matter.