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Subel. C
6 questions
Subelement C
Satellite Systems:
Section 24
C-Terminals:
Which of the following actions should be taken to minimize shock hazard of an Inmarsat terminal?
  • Ensure the DC power supply is insulated from the ship's hull.
  • Correct Answer
    Ensure the chassis of the Inmarsat terminal is connected to an electrical ground.
  • Install a common busbar for grounding to ensure common-mode coupling.
  • Isolate the transceiver's metal frame to avoid a return path for fault currents.
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How do you perform a LOOP BACK test?
  • Initiate a Performance Verification Test through terminal software.
  • Initiate a test to IP address: 127.0.0.1.
  • Correct Answer
    Send yourself a test message.
  • Request the LES to send you a test message.
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What do EGC messages contain?
  • Maritime Mobile Service Identity information.
  • SafeNetTM, FleetwideNetTM and System information.
  • Electronic Grounding Codes and System information.
  • Correct Answer
    SafetyNetTM, FleetNetTM and System information.
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Which of the following is not recommended for Inmarsat-C antenna installations?
  • Correct Answer
    Ensure the antenna is electrically insulated from the mounting mast. Check resistance with ohmmeter.
  • Ground the antenna chassis to the mounting mast. Apply silicone to weatherproof the connection.
  • Fashion a drip loop in the transmission line near the antenna. Secure to the mounting mast with cable tie.
  • Apply waterproof sealant or putty around transmission line connectors. Wrap with self-bonding/vinyl tape.
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How many NCS's operate in each Inmarsat ocean region per Inmarsat system?
  • Three
  • Four
  • Two
  • Correct Answer
    One
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What type of services cannot be provided by the Inmarsat-C system?
  • Correct Answer
    Telephone communications via VOIP.
  • Message transmission to and from a mobile unit.
  • Broadcast data to groups of mobile terminals.
  • Position reporting from fleets of mobile units.

Inmarsat-C does not include voice capability.

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