General Flashcards
6 cards from real CTS practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 General flashcards as text
A loudspeaker is rated at 95 dB SPL (1W/1m). How much additional power is required to increase the SPL by 6 dB at the same distance?
Answer: 4 watts
Every doubling of amplifier power increases SPL by 3 dB. To gain 6 dB, you must double power twice: 1W → 2W (+3 dB) → 4W (+6 dB). Therefore 4 watts total are required.
Which AVIXA document defines minimum performance standards for projected image size and viewing distances in AV systems?
Answer: AVIXA F501.01:2015 (DISCAS)
AVIXA F501.01:2015 is the DISCAS (Display Image Size for 2D Content in Audiovisual Systems) standard, which establishes minimum and maximum image sizes and viewing distances for projected and direct-view displays.
What is the primary function of a distribution amplifier (DA) in an AV signal chain?
Answer: To split and buffer one input signal to multiple outputs without impedance mismatch or signal degradation
A distribution amplifier takes a single source signal, buffers it (to prevent impedance loading), and distributes it to multiple destination devices with consistent signal levels and impedance matching.
In AV system design, what does 'gain structure' refer to?
Answer: The systematic setting of input and output levels throughout an audio signal chain to maximize SNR and headroom
Gain structure is the process of optimizing signal levels at each stage of an audio system — from source to processor to amplifier to loudspeaker — to maximize signal-to-noise ratio while maintaining adequate headroom to prevent clipping.
Which cable type is MOST appropriate for carrying unbalanced composite video signals over short runs in an AV installation?
Answer: RG-6 coaxial cable
Composite video is an unbalanced 75-ohm signal. RG-6 (or RG-59) coaxial cable is designed for 75-ohm unbalanced video at the correct impedance, minimizing reflections and attenuation.
An AV technician measures the output impedance of a microphone preamplifier at 150 ohms and the input impedance of the following mixer channel at 600 ohms. What is the impedance ratio, and is it acceptable?
Answer: 4:1 ratio — acceptable; audio convention requires load impedance to be at least 10× source impedance, but a 4:1 ratio will have minimal level loss
In professional audio, a 4:1 (load:source) impedance ratio is common and acceptable. The convention is that the load should be at least 10× (or sometimes 4×) the source impedance for voltage bridging. A 600:150 = 4:1 ratio causes minimal (<1 dB) level loss and is standard practice.