CAT Technical Skills 3

Question 1

What is the purpose of a delay line in a distributed audio system with multiple speaker zones?

Accepted Answer

Synchronize audio with distant speakers to avoid echo

Answer

Increase amplifier headroom

Answer

Reduce DC offset

Answer

Boost bass frequencies

Question 2

In a 70V distributed speaker system, what is the advantage of using a step-down transformer at each speaker?

Accepted Answer

It allows multiple speakers to be wired in parallel without impedance issues

Answer

It amplifies the signal

Answer

It converts the signal from analog to digital

Answer

It filters out low frequencies

Question 3

What is 'feedback' in an audio system and what is its primary cause?

Accepted Answer

A howling sound caused by a microphone picking up its own amplified output

Answer

Hum caused by a ground loop

Answer

Clipping distortion from overdriving an amplifier

Answer

Low-frequency rumble from mechanical vibration

Question 4

What does 'THD' measure in an audio amplifier?

Accepted Answer

Total Harmonic Distortion

Answer

Total High-frequency Delay

Answer

Thermal Heat Dissipation

Answer

Transient High-amplitude Detection

Question 5

A commercial audio technician is troubleshooting a 60 Hz hum in a system. What is the most likely cause?

Accepted Answer

Ground loop between two pieces of equipment

Answer

Incorrect EQ settings

Answer

Defective compression driver

Answer

Insufficient amplifier gain

Question 6

What is the recommended dB level for nominal line-level signals in professional (+4 dBu) audio equipment?

Accepted Answer

+4 dBu

Answer

-10 dBV

Answer

+20 dBu

Answer

0 dBFS

Question 7

Which amplifier class is most commonly used in high-efficiency commercial audio amplifiers due to its ability to switch between output states?

Accepted Answer

Class D

Answer

Class A

Answer

Class B

Answer

Class AB