默认题库 - 号灯与号型

单选题

Approaching an anchorage in fog，you hear one short，one prolonged，and one short blast in that sequence on a ship’s whistle． This indicates（）.

A vessel towed
B. A vessel not under command and unable to maneuver
C. A vessel anchored giving warning of her position
D. A vessel stopped dead in the water

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单选题

By night，you sight the lights of a vessel engaged in underwater operations. If an obstruction exists on the port side of the vessel，it will be marked by（）.

A. a floodlight
B. two red lights in a vertical line
C. a single red light
D. any visible light

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单选题

Daymarks marking the starboard side of the channel when going towards the sea are（）.

A. green squares
B. green triangles
C. red squares
D. red triangle

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单选题

Entering from seaward，triangular-shaped daymarks are used to mark（）.

A. the starboard side of the channel
B. the centerline of the channel
C. an obstruction where the preferred channel is to starboard
D. special purpose area

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单选题

Navigation lights must be displayed in all weathers from sunset to sunrise. They also（）.

A. must be displayed when day signals are being used
B. must be displayed when moored to a pier
C. may be extinguished at night on open waters when no other vessels are in the area
D. may be displayed during daylight

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单选题

On entering from seaward，a starboard side daymark will（）.

A. show a fixed red light if lighted
B. show a Morse (A) white light
C. be square in shape
D. have an even number if numbered

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单选题

Some lights used as aids to marine navigation have a red sector to indicate a danger area. The limits of a colored sector of a light are listed in the Light List in which of the following manners?（）

A. Geographical positions outlining the area of the sector
B. True bearings as observed from the ship toward the light
C. An outline of the area of the sector
D. True bearings as observed from the light toward the shi

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单选题

The International Regulations for Preventing Collisions at Sea contain the requirements for （）.

A. lights that must be displayed on anchor buoys
B. the display of load line markings
C. minimum horsepower for tugs involved in rig moves
D. lighting of mobile offshore drilling units being towed

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单选题

A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.

A. vessel being towed
B. fishing vessel engaged in trawling
C. vessel at anchor warning of her location
D. power-driven pilot vessel on station underway

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单选题

At sea，you are approaching a small vessel and see that it has the signal flag P hoisted. What should you do?（）.

A. Proceed on present course and speed since the vessel is stopped and making no way through the water
B. Keep clear of the vessel because it has a diver down
C. Attempt to call the vessel on VHF radiotelephone because someone on board requires medical assistance
D. Approach with caution because the vessel is a fishing vessel and its nets are fouled on an obstructio

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