C7 C7 Audio Visual & Communication Systems

Question 1

What is the minimum impedance typically required for speakers in a distributed audio system installed under a C7 license in California?

Accepted Answer

8 ohms

Answer

4 ohms

Answer

16 ohms

Answer

32 ohms

Question 2

Which cable type is most commonly used for analog audio signal transmission in a commercial intercom system?

Accepted Answer

Shielded twisted pair (STP)

Answer

Cat6 UTP

Answer

RG-6 coaxial

Answer

Fiber optic

Question 3

Under California Title 24, which low-voltage communication system requires a dedicated conduit pathway separate from power wiring?

Accepted Answer

Nurse call systems in healthcare occupancies

Answer

Doorbell wiring

Answer

Telephone wiring

Answer

Residential intercom

Question 4

What is the maximum recommended cable run length for a standard RS-485 communication bus used in an AV control system?

Accepted Answer

4,000 feet

Answer

100 feet

Answer

500 feet

Answer

10,000 feet

Question 5

Which grounding method is required for CATV/antenna systems installed by a C7 contractor to protect against lightning surges?

Accepted Answer

Bonding to the building's main grounding electrode system

Answer

Floating ground

Answer

Separate ground rod only

Answer

No grounding required for low-voltage systems

Question 6

In a video distribution system, what device is used to split a single coaxial signal to multiple TV outputs while maintaining signal level?

Accepted Answer

Signal amplifier/distribution amplifier

Answer

Balun

Answer

Passive splitter

Answer

Attenuator