AMERC ROC Channels, Simplex & Duplex Quiz
1. What frequency band is used for VHF communications?
156-162 MHz.
140-150 MHz.
180-200 MHz.
100-120 MHz.
2. Which of the following is the primary VHF channel for distress?
Channel 16 (156.8 MHz).
Channel 22.
Channel 70.
Channel 12.
3. What is the standard frequency for VHF DSC distress calls?
2187.5 kHz.
156.525 MHz.
406 MHz.
121.5 MHz.
4. Which frequency is used for maritime mobile-satellite communications?
156.0 MHz.
162.400 MHz.
162.550 MHz.
162.025 MHz.
5. What frequency is used for the Safety of Life at Sea (SOLAS) alerting?
2182 kHz.
156.8 MHz.
243 MHz.
156.450 MHz.
6. What is the purpose of Channel 70 in GMDSS?
For distress and safety messages.
For general communication.
For routine weather updates.
For inter-ship communication.
7. What is a Simplex communication system?
A system where both transmission and reception occur on the same frequency.
A system where transmission and reception occur on different frequencies.
A system that uses multiple frequencies.
A system that only transmits on a single channel.
8. What is a Duplex communication system?
A system where both transmission and reception occur on different frequencies.
A system where transmission and reception occur on the same frequency.
A system that only transmits on a single frequency.
A system that uses only one channel.
9. Which of the following is an example of a Duplex communication?
A phone call.
VHF maritime communication.
AM radio.
TV broadcast.
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