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单选题
When towing astern，increased catenary will（）.
A
increase control of the tow
B
prevent the towing vessel from going in irons
C
make the towing vessel less maneuverable
D
reduce shock stress on the towing hawser
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A mobile offshore drilling unit under tow is approaching a fog bank. When should fog signals be started?A.When the towing vessel enters the fogB.When the drilling rig enters the fogC.When the towing vessel can no longer be seen from the rigD.Immediately
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A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when ______.A.directly astern and pushing the towB.towing on a hawserC.towing alongside and parallel to the vessel it is towingD.towing on the hip
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A vessel towing a barge astern would show，at the stern ______.A.only a stern lightB.a towing light above the stern lightC.two towing lights in a vertical lineD.two white lights in a vertical line
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A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit ______.A.the masthead lights for a towing vesselB.the lights for a vessel restricted in its ability to maneuverC.sidelights，stern light and towing lightD.All of the above
考题
A chain bridle is used when towing astern because it ______.A.is easy to connectB.provides an effective catenary and absorbs shock due to its weightC.makes rigging a swivel unnecessaryD.prevents the tow from yawing by the drag of the chains in a seaway
考题
单选题A tug is best positioned for towing and maneuvering on rivers and other restricted waters where wave action is limited when（）.A
directly astern and pushing the towB
towing on a hawserC
towing alongside and parallel to the vessel it is towingD
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考题
单选题The biggest problem you generally encounter while towing a single tow astern is（）.A
the catenary dragging on the bottomB
swamping of the towC
the tow tending to diveD
yaw
考题
单选题You see a vessel carrying a black diamond which indicates a（）.A
vessel towing asternB
barge pushed aheadC
vessel towing astern only when the length of her tow exceeds 200 metersD
this signal does not exist in international waters
考题
单选题A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.A
the masthead lights for a towing vesselB
the lights for a vessel restricted in its ability to maneuverC
sidelights，stern light and towing lightD
All of the above
考题
单选题A vessel towing a barge astern would show，at the stern（）.A
only a stern lightB
a towing light above the stern lightC
two towing lights in a vertical lineD
two white lights in a vertical line
考题
单选题In astern towing，a tow span，also called the tow bar or towing arch，is used to（）.A
insure that the hawser leads directly aft as it passes over the stern of the towing vesselB
increase the stability of the towing vessel by raising the hawser off the deckC
reduce chafing of the towing hawserD
prevent fouling of the hawser on deck gear located on the stern of the towing vessel
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
All of the above
考题
单选题A chain bridle is used when towing astern because it（）.A
is easy to connectB
provides an effective catenary and absorbs shock due to its weightC
makes rigging a swivel unnecessaryD
prevents the tow from yawing by the drag of the chains in a seaway
考题
单选题An advantage of the Christmas Tree towing method is to（）.A
increase the towing hawser's catenary and provide more springB
reduce catenary，allow operation in shallower water，and to release one barge without breaking up the entire towC
enable one tug and its crew without any outside assistance to make up or break down the towD
provide rapid delivery of logs from the northwestern United States to Hawaiian sawmills
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
Increasing speed usually increases the catenary in the hawserD
Shortening the tow hawser generally decreases the maneuverability of the tug
考题
单选题A towing vessel is tripped when（）.A
it is overtaken by the towB
it is pulled sideways by the towC
the weight of the towing hawser causes loss of maneuverabilityD
the propeller is fouled by the towing hawser
考题
单选题A towing vessel becomes tripped while towing on a hawser astern. What factor is MOST important when assessing the risk of capsizing? （）A
Length of the towlineB
Height of the towline connectionC
Longitudinal position of the towline connectionD
Direction of opposing force
考题
单选题When towing astern，one way to reduce yawing of the tow is to（）.A
trim the tow by the sternB
trim the tow by the headC
have the tow on an even keelD
list the tow on the side it is yawing
考题
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
The towing line between the two vessels should be clear of the waterB
The towing line should be taut at all times between the vesselsC
There should be a catenary so the line dips into the waterD
None of the above
考题
单选题A single towing light will be carried above a vessel’s sternlight（）.A
only if she is towing asternB
only if the tow exceeds 200 metersC
at any time when towingD
if the towing vessel is part of a composite unit
考题
单选题A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.A
the masthead lights for a towing vesselB
the lights for a vessel restricted in its ability to maneuverC
sidelights，sternlight and towing lightD
All of the above
考题
单选题When towing astern what equipment should be stowed ready for use near the towline?（）A
First aid kitB
Axe or cutting torchC
Fire extinguisherD
Chafing gear
考题
单选题A power-driven vessel，when towing astern，shall show（）.A
two towing lights in a vertical lineB
a towing light in a vertical line above the sternlightC
two towing lights in addition to the sternlightD
a small white light in lieu of the sternlight
考题
单选题In towing it is desirable for the tug and the vessel to ride wave crests simultaneously because（）.A
shock loading on the tow line is reduceB
towing speed is improvedC
the vessel is more visible from the tugD
the catenary of the tow line is reduced
考题
单选题A tow astern is veering from side to side on its towline. The best way of controlling the action is to（）.A
trim the tow by the bowB
trim the tow by the sternC
list the tow to windwardD
adjust the length of the towing bridle
考题
单选题A towing vessel and her tow are severely restricted in their ability to change course. When making way，the towing vessel will show ONLY（）.A
the masthead lights for a towing vesselB
the lights for a vessel restricted in her ability to maneuverC
sidelights，stern light，and towing lightD
All of the above
考题
单选题To reduce stress on the towing hawser when towing astern (ocean tow)，the hawser should be （）.A
secured to the aftermost fitting on the towing vesselB
just touching the waterC
underwaterD
as short as possible
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