CBT Equipment & Troubleshooting 1

Question 1

Which device is commonly used to identify faults in a coaxial cable?

Accepted Answer

TDR (Time-Domain Reflectometer)

Answer

A Time-Domain Reflectometer (TDR) is the primary device used by broadcast technologists to identify faults in coaxial cables. It works by sending a pulse down the cable and measuring the reflections, which indicate the location and type of impedance changes, such as shorts, opens, or kinks. This allows for precise fault localization, crucial for maintaining signal integrity in broadcast systems.

Question 2

What should be the first step when diagnosing a broadcast equipment failure?

Accepted Answer

Observe symptoms and gather information

Answer

The first step in diagnosing any equipment failure is to systematically observe symptoms and gather all available information. This crucial initial phase helps to accurately identify the problem, prevent misdiagnosis, and avoid unnecessary or incorrect repair attempts. Rushing to replace parts without proper diagnosis often leads to wasted time and resources.

Question 3

Which instrument is used to view signal distortion in real-time?

Accepted Answer

Oscilloscope

Answer

An oscilloscope is an essential electronic test instrument that displays varying electrical signals as a waveform on a screen in real-time. This visual representation allows broadcast technicians to analyze signal characteristics, identify distortions, noise, or timing issues, and troubleshoot problems within audio, video, and RF circuits. It provides a dynamic view of how signals behave over time.

Question 4

What is a likely cause of low power output from a transmitter?

Accepted Answer

Damaged output connector

Answer

A damaged output connector on a transmitter can lead to significant signal loss and impedance mismatches, preventing the efficient transfer of RF power to the antenna. This direct physical fault will result in a measurable reduction in the transmitter's power output. Other options are less direct causes of low output power from the transmitter itself.

Question 5

Which device helps verify broadcast frequency alignment?

Accepted Answer

Frequency counter

Answer

A frequency counter is a specialized electronic instrument designed to accurately measure the frequency of a periodic electronic signal. In broadcast, it is critical for verifying that a transmitter is operating precisely on its assigned frequency, ensuring compliance with regulatory standards and preventing interference with other broadcast services. This device provides a direct digital readout of the signal's frequency.

(CBT) Certified Broadcast Technologist Practice Test

(CBT) Certified Broadcast Technologist Practice Test

CBT Equipment & Troubleshooting 1