默认题库 - 号灯与号型

单选题

A 200-meter vessel restricted in her ability to maneuver，at anchor，will sound a fog signal of（）.

A. a 5 second ringing of a bell forward and a 5 second sounding of a gong aft at intervals of 1 minute
B. one prolonged followed by two short blasts every 2 minutes
C. one prolonged followed by three short blasts every minute
D. one prolonged followed by three short blasts every 2 minute

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单选题

A 95-meter vessel aground sounds which fog signal? （）

A rapid ringing of a bell for 5 seconds every two minutes
B. A whistle signal of one short，one prolonged，and one short blast
C. A prolonged blast of the whistle at intervals not to exceed one minute
D. A rapid ringing of a bell for 5 seconds，preceded and followed by three separate and distinct strokes on the bell

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单选题

A flashing light is a light that（）.

A. flashes at regular intervals at a frequency of 120 flashes or more per minute
B. is yellow in color
C. is visible over an arc of the horizon of not less than 180°nor more than 225°
D. All of the above

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单选题

A power-driven vessel towing another vessel astern (tow less than 200 meters) shall show （）.

A. three masthead lights in a vertical line instead of either the forward or after masthead light
B. two masthead lights in a vertical line instead of either the forward or after masthead lights
C. two towing lights in a vertical line at the stern
D. a small white light aft of the funnel

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单选题

A red triangular daymark marks（）.

A. the centerline of a navigable channel
B. the starboard side of a channel
C. a prominent object of navigational interest that has no lateral significance
D. area of a channel where passing another vessel is permitted

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单选题

A single towing light will be carried above a vessel’s sternlight（）.

A. only if she is towing astern
B. only if the tow exceeds 200 meters
C. at any time when towing
D. if the towing vessel is part of a composite unit

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单选题

A towing light，according to the Rules，is a（）.

A. white light
B. red light
C. yellow light
D. blue light

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单选题

A towing vessel 30 meters in length is pushing barges ahead. How many white masthead lights is the vessel REQUIRED to show at night?（）

A. One
B. Two
C. Three
D. Four

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单选题

A tug is towing three manned barges in line in fog. The first vessel of the tow should sound （）.

A. no fog signal
B. one short blast
C. one prolonged and three short blasts
D. one prolonged，one short，and one prolonged blast

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单选题

An all-round flashing yellow light may be exhibited by a(n)（）.

A. vessel not under command
B. air cushion vessel in the nondisplacement mode
C. vessel towing a submerged object
D. vessel engaged in diving operatio

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