CBT Audio and Video Systems — Questions and Answers
Question 1: What is the primary function of a microphone in an audio system?
- Convert electrical signals to light
- Store recorded signals
- Convert sound into electrical signals (Correct answer)
- Transmit RF signals
Correct answer: Convert sound into electrical signals
A microphone converts acoustic sound waves into electrical signals for further processing in an audio chain.
Question 2: Which video standard is primarily used in North America for analog broadcasting?
- PAL
- SECAM
- NTSC (Correct answer)
- SDI
Correct answer: NTSC
NTSC (National Television System Committee) is the analog television standard traditionally used in North America.
Question 3: What is the role of an audio mixer in a studio environment?
- Increase microphone signal strength only
- Select video camera feeds
- Blend and route multiple audio signals (Correct answer)
- Transmit RF signals to antenna
Correct answer: Blend and route multiple audio signals
An audio mixer combines multiple audio inputs, adjusts levels, and routes audio to different outputs.
Question 4: Which connector is commonly used for professional analog audio?
- HDMI
- XLR (Correct answer)
- BNC
- USB
Correct answer: XLR
The XLR connector is the standard for balanced analog audio in professional environments, offering noise rejection and secure connection.
Question 5: What does the term 'SDI' refer to in video systems?
- Standard Data Interface
- Secure Device Interface
- Serial Digital Interface (Correct answer)
- Signal Delay Input
Correct answer: Serial Digital Interface
SDI (Serial Digital Interface) is a digital video interface standard used to transmit uncompressed digital video signals over coaxial cable.
Question 6: Which component converts electrical video signals into visible light on a display?
- RF Modulator
- Video switcher
- Display monitor (Correct answer)
- Time base corrector
Correct answer: Display monitor
A video display such as an LED or LCD screen takes electronic video signals and transforms them into images visible to the human eye.
CBT Audio and Video Systems
What is the primary function of a microphone in an audio system?