100+ Free SBE CRO Practice Questions

Explanation: The CRO exam is drawn entirely from the material in the SBE Certification Handbook for Radio Operators. It is a closed-book exam, and a sample test at the end of the handbook closely reflects the actual test. Studying the handbook is the recommended preparation path.

Explanation: Operating logs document that the station operated in compliance with its license and FCC rules, recording required entries such as tower light status, EAS test activity, and equipment readings or malfunctions. They serve as a record an operator and the station can rely on to demonstrate proper operation.

Explanation: Per 47 CFR 73.1201, the official station ID is the call letters immediately followed by the community (or communities) specified in the license as the station's location. The frequency and licensee name may optionally be inserted between the call letters and community, but the community of license is the required element.

Explanation: FCC rules require the station ID at the beginning and ending of each time of operation and hourly, as close to the top of the hour as feasible at a natural break in programming. This may fall during a commercial break or other natural pause near the hour.

Explanation: RWT is the EAS event code for the Required Weekly Test. The RWT, at a minimum, consists of the header and end-of-message (EOM) tones and is transmitted weekly. It does not require the audio attention signal or a spoken message.

Explanation: RMT is the EAS event code for the Required Monthly Test. RMTs are typically originated by a state or local primary station, a state emergency management agency, or the National Weather Service and then relayed by participating stations. They include the audio attention signal and a test message.

Explanation: In professional broadcast and recording equipment, 0 VU is referenced to +4 dBu (1.228 V RMS across 600 ohms at 1 kHz). The operator must remember that 0 VU is an average reading and that program peaks typically run 6 to 10 dB higher.

Explanation: dBFS means decibels relative to full scale, and 0 dBFS is the maximum possible digital level. Any signal exceeding 0 dBFS clips and distorts. Operators leave headroom by keeping nominal levels well below 0 dBFS, often aligning the analog reference to around -18 or -20 dBFS.

Explanation: In amplitude modulation, the amplitude (strength) of the carrier is varied in proportion to the audio signal while the carrier frequency stays constant. Because information rides on amplitude, AM is more susceptible to amplitude-based interference such as lightning and electrical noise.

Explanation: The U.S. AM (medium-wave) broadcast band runs from 535 to 1705 kHz, with channels spaced every 10 kHz. AM signals can travel long distances, especially at night via ionospheric skywave propagation.