NAB Broadcasting Technology & Equipment 2

Question 1

What is the primary function of a distribution amplifier (DA) in a broadcast facility?

Accepted Answer

Split and amplify a single signal to multiple destinations without level loss

Answer

A distribution amplifier splits one input signal into multiple isolated outputs while maintaining proper signal levels.

Question 2

Which modulation technique does ATSC 3.0 (NextGen TV) use for its physical layer?

Accepted Answer

OFDM (Orthogonal Frequency Division Multiplexing)

Answer

ATSC 3.0 uses OFDM, which provides better multipath rejection and mobile reception compared to the 8-VSB used in ATSC 1.0.

Question 3

In digital audio, what does the term 'bit depth' determine?

Accepted Answer

The dynamic range and resolution of audio samples

Answer

Bit depth determines the number of amplitude levels available per sample, directly setting dynamic range (approximately 6 dB per bit).

Question 4

What is the purpose of a frame synchronizer in broadcast video routing?

Accepted Answer

Lock an incoming video signal to the local house sync reference

Answer

A frame synchronizer buffers an incoming signal and re-clocks it to align with the facility's house sync, preventing roll or tearing when switching sources.

Question 5

What is the standard impedance of a coaxial cable used for broadcast video (SDI)?

Accepted Answer

75 ohms

Answer

Broadcast SDI video uses 75-ohm coaxial cable, which is also the impedance of the BNC connectors used throughout the industry.

(NAB) National Association of Broadcasters Certification Practice Test

(NAB) National Association of Broadcasters Certification Practice Test

NAB Broadcasting Technology & Equipment 2