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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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考题
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
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考题
单选题A vessel towing a barge astern would show，at the stern（）.A
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考题
单选题The catenary（）.A
acts as a reserve length of towing hawser when the tug applies more power，and it dampens the surge effect of the towB
gives an approximation of the amount of strain on the towing hawserC
is the dip in the towing hawser between the tug and the towD
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考题
单选题How do the height and location of a tug’s towing bitts relate to the danger of tripping?（）A
The further forward and closer to amidships the more readily the tug will tripB
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Installing the bitts down low lowers the center of gravityD
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考题
单选题Which statement is TRUE concerning hawser towing? （）A
The catenary in a hawser should be sufficient so that the hawser just touches the bottomB
The hawser is of sufficient length for towing when taut between tug and towC
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Shortening the tow hawser generally decreases the maneuverability of the tug
考题
单选题You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.A
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A prolonged blast at intervals never to exceed more than two minutesC
A prolonged blast followed by two short blasts at intervals never to exceed more than two minutesD
A prolonged blast followed by three short blasts at intervals never to exceed more than one minute
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单选题If the situation arose where it became necessary to tow a disabled vessel，which statement is TRUE concerning the towing line?（）.A
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单选题A power-driven vessel，when towing astern，shall show（）.A
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考题
单选题A face line is used to（）.A
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secure two barges end-to-endC
secure barges to the towboatD
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考题
单选题If the towline parts，you should（）.A
start towing by pushing aheadB
abandon the towing vesselC
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考题
单选题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 metersB
towing vessel is greater than 50 metersC
tow is less than 200 metersD
tow is greater than 200 meters
考题
单选题Which statement concerning an automatic towing engine is FALSE? （）A
It automatically maintains tow line tensionB
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As tension on the hawser decreases，more line is taken in by the automatic towing engine
考题
单选题As operator of a 199 GT towing vessel sailing foreign，it shall be your duty to enter in the Official Logbook or other permanent record（）.A
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all navigational aids to be usedD
the barges load line and draft readings
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