CAT Industry Knowledge and Safety Standards 2

Question 1

Under OSHA regulations, what is the permissible exposure limit (PEL) for continuous noise over an 8-hour workday?

Accepted Answer

90 dB(A)

Answer

OSHA sets the 8-hour TWA PEL for noise at 90 dB(A), with a 5 dB exchange rate.

Question 2

Which NFPA code specifically governs the installation of audio/visual systems in life safety applications?

Accepted Answer

NFPA 72

Answer

NFPA 72, the National Fire Alarm and Signaling Code, covers audio/visual emergency notification systems.

Question 3

What does the acronym MSDS stand for in the context of commercial audio installation?

Accepted Answer

Material Safety Data Sheet

Answer

MSDS (now called SDS under GHS) provides hazard information for chemicals used during installation such as adhesives and solvents.

Question 4

A CAT technician is working in a venue with a reverb time of 3.5 seconds. Which treatment would most effectively reduce low-frequency buildup?

Accepted Answer

Corner-mounted bass traps

Answer

Bass traps placed in room corners are most effective at absorbing low-frequency energy where it naturally accumulates.

Question 5

Which standard defines the minimum wire gauge requirements for speaker circuits carrying 70-volt distributed audio in commercial installations?

Accepted Answer

NEC Article 640

Answer

NEC Article 640 addresses audio signal processing and amplification equipment, including speaker wiring requirements.

(CAT) Commercial Audio Technician Practice Test