VDV Audio/Video Systems Installation 4

Question 1

Which tool is used to verify that an HDMI cable will support 4K/60Hz signals before installation in a finished wall?

Accepted Answer

HDMI signal tester/verifier

Answer

An HDMI signal tester verifies that the cable can carry 4K/60Hz by checking bandwidth, HDCP handshake, and signal integrity.

Question 2

What is the purpose of a ground loop isolator in an audio system?

Accepted Answer

To eliminate the 60Hz hum caused by different ground potentials between equipment

Answer

A ground loop isolator uses a transformer to break the DC path between two pieces of equipment, eliminating hum caused by ground potential differences.

Question 3

A rack is running hot and equipment is shutting down due to thermal protection. What is the FIRST corrective action a technician should take?

Accepted Answer

Add a rack-mount exhaust fan and verify adequate front-to-back airflow

Answer

Installing a rack exhaust fan and ensuring proper front-to-back airflow is the most immediate and effective solution for rack thermal issues.

Question 4

When installing a home theater surround sound system, what is the recommended placement angle for surround speakers relative to the primary listening position?

Accepted Answer

90 to 110 degrees to the side

Answer

Dolby and DTS recommend placing 5.1 surround speakers at 90–110 degrees to the sides of the listening position for optimal envelopment.

Question 5

What does 'signal-to-noise ratio' (SNR) measure in an audio system?

Accepted Answer

The level of the desired signal compared to the level of background noise

Answer

SNR measures how much stronger the desired audio signal is compared to the unwanted noise floor, expressed in decibels (dB).

(VDV) Voice Data Video Technician Certified Practice Test

(VDV) Voice Data Video Technician Certified Practice Test

VDV Audio/Video Systems Installation 4