VDV Audio/Video Systems Installation

Question 1

What cable type is commonly used for HDMI installations?

Accepted Answer

HDMI

Answer

HDMI (High-Definition Multimedia Interface) is a proprietary audio/video interface for transmitting uncompressed video data and compressed or uncompressed digital audio data from an HDMI-compliant source device to a compatible computer monitor, video projector, digital television, or digital audio device. It is the standard cable type for modern high-definition video installations.

Question 2

What is the main advantage of using balanced audio cables?

Accepted Answer

They cancel noise

Answer

Balanced audio cables use three conductors: two signal wires (hot and cold) and a ground wire. By transmitting the audio signal as a differential voltage, any induced electromagnetic interference or noise picked up along the cable run affects both signals equally. The receiving device then subtracts one signal from the other, effectively canceling out the common-mode noise while preserving the original audio signal.

Question 3

Which connector type is used for professional audio equipment?

Accepted Answer

XLR

Answer

XLR connectors are robust, locking, multi-pin electrical connectors commonly used for professional audio and video equipment. They are primarily known for their use with balanced audio signals, which helps to minimize noise over long cable runs, making them ideal for microphones, mixers, and other high-fidelity audio applications in professional settings.

Question 4

Why is impedance matching important in AV systems?

Accepted Answer

Prevents signal loss

Answer

Impedance matching in AV systems ensures that the output impedance of a source device closely matches the input impedance of the receiving device. When impedances are mismatched, a portion of the signal can be reflected back to the source, leading to signal loss, reduced audio/video quality, and potential damage to equipment. Proper matching maximizes power transfer and maintains signal integrity.

Question 5

Which standard defines 4K video resolution?

Accepted Answer

2160p

Answer

4K video resolution is commonly defined as 3840 x 2160 pixels, which is also referred to as 2160p. This resolution offers four times the pixel count of Full HD (1080p), providing significantly sharper images, greater detail, and a more immersive viewing experience in modern displays and content.

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Audio/Video Systems Installation