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CompTIA DHTI+ Practice Questions

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What is the normal impedance level of a coaxial cable terminated with a BNC connector?
  1. 35 ohms
  2. 75 ohms
  3. 55 ohms
  4. 120 ohms
Explanation
Answer - B - The normal impedance level of a coaxial cable terminated with a BNC connector is 75 Ohms.

Key Takeaway: The BNC connector is used for RF signal connections for both analog and Serial Digital Interface video signals. BNC connectors have an impedance of 75 ohms. They are specified for use at frequencies up to 4 and 2 GHz respectively. 75 ohm BNC Connectors are used for video and DS3 Telco central office applications.
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