默认题库 - 遇险通信

单选题

When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.

A. 10 minutes
B. 1 minute
C. 1 hour
D. 3 minute

单选题

When can routine communications be resumed when radio silence has been imposed?（）

After determining that the frequency or channel appears to be no longer in use
B. After determining that geographic distance from the distress situation will prohibit any other signal from interfering with emergency communications
C. Routine communications can resume after the Rescue Coordination Center transmits a message on the frequency or channel being used for emergency communications stating that such traffic has concluded
D. If，in the Master's opinion，communications on that frequency will interfere with emergency communicatio

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单选题

When sending a DSC call，the vessel’s（）.

A. position will automatically be sent
B. position will only be sent if the vessel is making a distress call
C. MMSI will indicate its ocean region
D. None of the above

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单选题

When should distress flares and rockets be used? （）

A. Immediately upon abandoning the vessel
B. Only when there is a chance of their being seen by a rescue vessel
C. At one hour intervals
D. At half hour interval

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单选题

Which is NOT a distress signal? （）

A continuous sounding with any fog signal apparatus
B. A signal sent by radiotelephone consisting of the spoken word "Mayday"
C. An International Code Signal of
D. The firing of green star rockets or shell

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单选题

Which categories of NAVTEX messages may not be selectively rejected through receiver programming?（）

A. Navigational warnings
B. Weather warnings
C. SAR and distress alert information
D. All of the above

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单选题

Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）

A. If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
Distress messages should first be transmitted on 2182 kHz

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单选题

If your vessel is underway in fog and you hear one prolonged and three short blasts，this indicates a（）.

A. vessel not under command
B. sailing vessel
C. vessel in distress
D. vessel being towed

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单选题

The signal to guide vessels in distress，which indicates，“This is the best place to land” is the（）.

A. horizontal motion of a white flag
B. letter K in Morse code given by light
C. code flag S as a hoist
D. firing of a white star signal

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单选题

The distress message of a ship should include considerable information which might facilitate the rescue. This information should（）.

ALWAYS be included in the initial distress message
B. be sent to a Coast Guard station FIRST
C. be transmitted as a series of short messages，if time allows
D. include the vessel's draft

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