航海英语号灯与号型章节练习(2018.01.25)

单项选择题
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 obstruction
单项选择题
A power-driven vessel，when towing astern，shall show（）.
A.two towing lights in a vertical line
B.a towing light in a vertical line above the sternlight
C.two towing lights in addition to the sternlight
D.a small white light in lieu of the sternlight
单项选择题
An occulting light is one in which（）.
A.the period of darkness exceeds the period of light
B.there is only a partial eclipse of the light
C.the periods of light and darkness are equal
D.the period of light exceeds the period of darkness
单项选择题
A vessel towing is showing three forward white masthead lights in a vertical line. This means that the length of the（）.
A.towing vessel is less than 50 meters
B.towing vessel is greater than 50 meters
C.tow is less than 200 meters
D.tow is greater than 200 meters
单项选择题
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
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
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
单项选择题
During the day，a vessel with a tow over 200 meters in length will show（）.
A.a black ball
B.a diamond shape
C.two cones，apexes together
D.one cone，apex upward
单项选择题
As defined in the Rules，a towing light is a yellow light having the same characteristics as a(n)（）.
A.masthead light
B.all-round light
C.sidelight
D.sternlight
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