航海英语号灯与号型章节练习(2019.05.03)

单项选择题
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
单项选择题
A power-driven vessel underway shall keep out of the way of（）.
A.a vessel restricted in her ability to maneuver
B.a vessel under command
C.a passenger ship
D.a seaplane on the water
单项选择题
All fog signals shall be sounded every two minutes with the exception of a vessel（）.
A.underway or making way
B.under sail or under tow
C.anchored or aground
D.not under command or restricted in her ability to maneuver
单项选择题
A vessel being towed astern，where the length of the tow exceeds 200 meters，will exhibit （）.
A.two balls in a vertical line
B.a diamond shape where it can best be seen
C.a ball on each end of the tow
D.no dayshape
单项选择题
The duration of a prolonged blast of the whistle is（）.
A.2 to 4 seconds
B.4 to 6 seconds
C.6 to 8 seconds
D.8 to 10 seconds
单项选择题
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 ship
单项选择题
Which vessel，when anchored at night，is NOT required to show anchor lights?（）.
A.A power-driven vessel
B.A vessel engaged on pilotage duty
C.A vessel dredging
D.A vessel restricted in her ability to maneuver
单项选择题
A power-driven vessel shall have her engine ready for（）when the visibility is restricted.
A.immediately stop
B.immediately maneuvering
C.immediately anchoring
D.immediately going astern
单项选择题
A 95-meter vessel aground sounds which fog signal? （）
A.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
单项选择题
While underway，in fog，you hear a whistle signal of one prolonged blast followed by two short blasts. This signal is sounded by a vessel（）.
A.not under command
B.being towed
C.on pilotage duty
D.aground