超星 - 作业（九）

单选题

What are Maritime Safety Information broadcasts?

A. Mobile distress alerts, weather forecasts, coastal warmings and similar inform
B. Hourly weather broadcasts from CRSs.
Coast Guarding units broadcasts.
D. Messages to pre-defined groups of subscribers.

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单选题

If you receive a NAVARE A warning message through NATEA containing too many errors, ___________.

A. the message is transmitted in FEC and may be repeated
B. try to receive the messages concerned on other systems
C. contacting the NAVAREA coordinator is a useful method
D. all of the above

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单选题

Which statement is true of a NAVTEX receiver?

A. Reception is not available in Ocean Area I.
B. Operates on 518 kHz.
C. One must transmit a request signal to initialize the coastal station.
D. Receives distress transmission directly from ships operating in the same Ocean Area.

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单选题

Which of the following is able to receive MSI sent by coast stations in GMDSS?

A. NAVTEX receivers.
B. EGC receivers.
C. MF / HF radio telephone sets.
D. HF radio telephone sets with NBDP abilities.

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单选题

Generally, MSI is broadcast via ____________.

A. NAVTEX
B. EGC
C. HF-Telex
D. all of the above

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单选题

What language does International NAVTEX use?

A. Russia
B. French.
C. English.
D. German.

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单选题

As each MSI message will have a unique identity, the printing of message that already received correctly is _____________.

A. automatically suppressed
B. finished by the operator
C. manually suppressed
D. done again

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单选题

NAVTEX is a simple, cheap, automated receiver which can be mounted_______________.

A. on the bridge
B. on the deck
C. in the holds
D. in the engine room

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单选题

What means is used to avoid mutual interference by stations in the NAVTEX system?

A. Stations are limited to daytime operation only.
Both of the following measures are necessary. transmitter power is limited to that necessary for coverage of assigned area and transmissions by stations in each NAVAREA are arranged in a time-sharing basis.
C. Transmitter power is limited to chat necessary for coverage of assigned area.
D. Transmissions by stations in each NAVAREA are arranged in a time-sharing basis.

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单选题

What is an indication of an out-of paper condition on a NAVTEX receiver?

A. Unit ceases all operation until paper is replaced.
B. Audible and / or visual alarm signal is displayed.
C. External alarm. if fitted, is activated.
D. All of the above.

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