默认题库 - 海上通信基本知识

单选题

The following（）is a standard phrase.

A. You may enter fairway
B. You should enter fairway
C. ANSWEIt is permitted to enter fairway
D. You could enter fairway

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单选题

The range of a SSB transmission is MOST affected by（）.

A. atmospheric noise and radiated power
B. the frequency band selected and time of day or night
C. interference and position of the moon
D. radiated power and nearness to shore

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单选题

The unit of duration of a dash in Morse Code is（）.

A. one and one-half times the length of a dot
B. twice the length of a dot
C. three times the length of a dot
D. four times the length of a dot

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单选题

The Vessel Bridge-to-Bridge Radiotelephone Act applies to（）.

A. every towing vessel of 16 feet or over in length while navigating
B. every vessel of 50 GT and upward，carrying one or more persons for hire
C. all aircraft operating on the water
D. every power-driven vessel of 20 meters and upward while navigating

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单选题

To reduce the amount of catenary you may（）.

A. shorten the hawser or increase the tug's speed
B. lengthen the hawser or reduce the tug's speed
C. place your tug in irons
D. make a sharp tur

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单选题

When may the automatic identification system (AIS) be switched off? （）

At anytime as long as it is properly logged
B. At the Master's professional judgment
C. Only when the vessel is at anchor or in port
D. Under no circumstance

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单选题

When should the emergency position-indicating radiobeacon be activated after abandoning a ship?（）

A. Immediately
B. After one hour
C. Only when another vessel is in sight
D. Only after sunset

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单选题

Which information must automatic identification systems (AIS) automatically provide to appropriately equipped shore stations，vessels and aircraft? （）

A. Vessel's type
B. Vessel's course
C. Navigational status
D. All of the above

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单选题

Which of the following statements is TRUE regarding automatic identification systems (AIS)? （）

AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position，course，speed and other safety related information to all those with similar equipment in the area
B. AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position，course，speed and other safety related information to all those with similar equipment in the area
C. AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position，course，speed and other safety related information to all those with similar equipment in the area
D. AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position，course，speed and other safety related information to all those with similar equipment within the area

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单选题

Which of the following statements is TRUE regarding automatic identification systems (AIS) ?（）

A. The master may，at his/her discretion，turn off the AIS if he/she believes that it may compromise the safety or security of the vessel
B. Under no circumstances shall AIS be turned off while underway as this could endanger the vessel and those around her
C. AIS is always required to be operating if the vessel is in or in the vicinity of a VTS area
D. AIS is always required to be operating if the vessel is within 100 nautical miles of the coastline

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