CBT Safety & Compliance Standards 2 — Questions and Answers
Question 1: What is the maximum permissible exposure (MPE) limit for RF radiation at broadcast frequencies as defined by the FCC for general population/uncontrolled environments?
- 1.0 mW/cm² at all frequencies
- Power density varies by frequency per OET Bulletin 65 (Correct answer)
- 5 mW/cm² flat limit regardless of frequency
- 0.1 mW/cm² at all frequencies
Correct answer: Power density varies by frequency per OET Bulletin 65
FCC OET Bulletin 65 specifies frequency-dependent MPE limits for uncontrolled environments, not a flat value.
Question 2: Which OSHA standard governs lockout/tagout (LOTO) procedures for broadcast transmission equipment?
- 29 CFR 1910.147 (Correct answer)
- 29 CFR 1910.303
- 47 CFR Part 73
- NFPA 70E Article 120
Correct answer: 29 CFR 1910.147
OSHA 29 CFR 1910.147 is the Control of Hazardous Energy (Lockout/Tagout) standard that applies to broadcast equipment maintenance.
Question 3: A broadcast tower requires aviation obstruction lighting. Which FAA Advisory Circular primarily governs obstruction marking and lighting requirements?
- AC 70/7460-1 (Correct answer)
- AC 150/5345-53
- AC 90-48
- AC 43.13-1
Correct answer: AC 70/7460-1
FAA Advisory Circular 70/7460-1 (Obstruction Marking and Lighting) is the primary guidance for tower lighting requirements.
Question 4: When using a spectrum analyzer near energized high-voltage equipment, which personal protective equipment (PPE) is required per NFPA 70E?
- Standard safety glasses only
- Arc flash-rated PPE appropriate for the incident energy level (Correct answer)
- Rubber gloves rated for 1000V minimum
- Only a hard hat is required
Correct answer: Arc flash-rated PPE appropriate for the incident energy level
NFPA 70E requires arc flash-rated PPE selected based on the calculated incident energy at the work location.
Question 5: What FCC rule requires broadcast licensees to file an environmental assessment before constructing a new antenna tower?
- 47 CFR Part 1 Subpart I (Correct answer)
- 47 CFR Part 73.1690
- 47 CFR Part 17.7
- 47 CFR Part 11.21
Correct answer: 47 CFR Part 1 Subpart I
47 CFR Part 1 Subpart I implements NEPA requirements, including environmental assessments for new antenna structures.
Question 6: In a broadcast facility, the National Electrical Code (NEC) Article 520 applies specifically to which environment?
- Studio transmitter links
- Theaters, audience areas, and similar locations (Correct answer)
- Antenna transmission lines
- Emergency broadcast equipment rooms
Correct answer: Theaters, audience areas, and similar locations
NEC Article 520 covers theaters, audience areas, motion picture studios, and similar locations commonly found in broadcast facilities.
Question 7: What is the minimum safe working distance from an energized AM broadcast antenna base for an unprotected worker, according to IEEE C95.1?
- It depends on the station's ERP and frequency (Correct answer)
- 10 feet at all times regardless of power
- 5 meters from the base insulator
- There is no IEEE-specified distance for AM antennas
Correct answer: It depends on the station's ERP and frequency
IEEE C95.1 RF safety distances are calculated based on the specific power level and frequency, so the safe distance varies by station.
CBT Safety & Compliance Standards 2
What is the maximum permissible exposure (MPE) limit for RF radiation at broadcast frequencies as defined by the FCC for general population/uncontrolled environments?