CBT - Certified Broadcast Technologist Safety Standards and Practices Questions and Answers — Questions and Answers
Question 1: A technician is tasked with performing maintenance on a high-power FM antenna. Before ascending the tower, which of the following is the most critical safety procedure to perform?
- Notify the station's General Manager of the planned work.
- Wear a personal RF monitor to check for dangerous radiation levels while working.
- Ensure the transmitter is de-energized and a lockout/tagout (LOTO) device is applied to the main circuit breaker. (Correct answer)
- Review the station's most recent FCC RF exposure compliance report.
Correct answer: Ensure the transmitter is de-energized and a lockout/tagout (LOTO) device is applied to the main circuit breaker.
The most critical safety step is to completely de-energize the transmitter and apply a lockout/tagout (LOTO) device. This physically prevents the equipment from being turned on accidentally, which could expose the technician to lethal voltages and extremely dangerous levels of RF radiation. While other options are good practices, only LOTO ensures the energy source is controlled.
Question 2: FCC OET Bulletin 65 and its supplements provide guidelines for broadcast stations primarily to:
- Set the maximum allowable transmitter power output for a given station class.
- Determine the appropriate tower lighting and marking requirements for aviation safety.
- Mandate the use of specific brands of personal protective equipment (PPE) for tower climbers.
- Evaluate compliance with Maximum Permissible Exposure (MPE) limits for human exposure to RF fields. (Correct answer)
Correct answer: Evaluate compliance with Maximum Permissible Exposure (MPE) limits for human exposure to RF fields.
OET Bulletin 65 is the FCC's primary guidance document for helping stations evaluate whether their facilities comply with the FCC's safety limits for human exposure to radiofrequency (RF) electromagnetic fields. It provides methods for calculating or measuring RF fields to ensure they do not exceed the Maximum Permissible Exposure (MPE) limits for both the general public and occupational personnel.
Question 3: While working in a transmitter room, a technician notices smoke and a small fire originating from inside a high-voltage power supply rack that is still energized. Which class of fire extinguisher is appropriate for this situation?
- Class A
- Class B
- Class C (Correct answer)
- Class K
Correct answer: Class C
Class C fire extinguishers are designed for use on fires involving energized electrical equipment. They use a non-conductive agent, such as carbon dioxide or a dry chemical, that will not create a shock hazard for the operator. Using a Class A (water-based) extinguisher would be extremely dangerous due to the risk of electrocution.
Question 4: When performing maintenance on a large lead-acid battery bank used for a station's UPS system, what minimum personal protective equipment (PPE) is essential to protect against the primary chemical hazard?
- Steel-toed boots and a hard hat.
- Acid-resistant gloves and safety goggles or a face shield. (Correct answer)
- A fall protection harness and a personal RF monitor.
- Hearing protection and a dust mask.
Correct answer: Acid-resistant gloves and safety goggles or a face shield.
Lead-acid batteries contain sulfuric acid, which is extremely corrosive. The primary chemical hazard is an acid splash, which can cause severe burns to the skin and eyes. Therefore, wearing acid-resistant gloves and chemical splash goggles or a full face shield is the minimum essential PPE for this task.
Question 5: Which of the following is a primary purpose of the OSHA Lockout/Tagout (LOTO) standard (29 CFR 1910.147)?
- To ensure equipment is properly labeled with its operating frequency and power.
- To prevent the unexpected startup or release of stored energy during equipment servicing. (Correct answer)
- To document all maintenance activities for regulatory review.
- To restrict public access to hazardous areas like transmitter sites.
Correct answer: To prevent the unexpected startup or release of stored energy during equipment servicing.
The OSHA Lockout/Tagout standard is specifically designed to protect workers by preventing the unexpected energization, start-up, or release of stored energy from machines and equipment during service or maintenance activities. It requires that energy sources be isolated and rendered inoperative before work begins.
Question 6: A technician must work on equipment near the base of a high-power broadcast tower on a winter day. Besides being aware of RF fields, what is a critical physical hazard for which the technician must wear a hard hat?
- Loud noise from cooling fans.
- Exposure to ultraviolet radiation.
- Falling ice or equipment from the tower structure. (Correct answer)
- Static discharge from the tower.
Correct answer: Falling ice or equipment from the tower structure.
Broadcast towers can accumulate significant amounts of ice in winter, which can break off and fall, posing a serious impact hazard to anyone below. Similarly, tools or hardware could be accidentally dropped by climbers. Therefore, wearing a hard hat is a critical safety measure for protecting ground personnel from falling objects.
CBT - Certified Broadcast Technologist Safety Standards and Practices Questions and Answers
A technician is tasked with performing maintenance on a high-power FM antenna.
Before ascending the tower, which of the following is the most critical safety procedure to perform?