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单选题
The catenary in a towline is（）.
A
a short bridle
B
the downward curvature of the hawser
C
another name for a pelican hook
D
used to hold it amidships
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考题
The catenary in a towline is ______.A.a short bridleB.the downward curvature of the hawserC.another name for a pelican hookD.used to hold it amidships
考题
The disadvantage of using a heaving line to pass a towline is that ______.A.it increases the likelihood of collision between the towing vessel and the disabled vesselB.recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towlineC.the monkey fist may injure someoneD.it may reduce the catenary and increase yawing
考题
In towing，chocks are used to ______.A.protect the towline from chafingB.secure the end of the towline on the tugC.stop off the towline while retrieving itD.absorb shock loading on the towline
考题
During the towing of a survival craft，a lookout should be on station to ______．A.release the towline in an emergencyB.help the helmsman steerC.look for food and waterD.check the water level in the bilge
考题
单选题The disadvantage of using a heaving line to pass a towline is that（）.A
it increases the likelihood of collision between the towing vessel and the disabled vesselB
recreational boaters tend to make the heaving line fast to the towed vessel as if it were the towlineC
the monkey fist may injure someoneD
it may reduce the catenary and increase yawing
考题
单选题During the towing of a survival craft，a lookout should be on station to（）.A
release the towline in an emergencyB
help the helmsman steerC
look for food and waterD
check the water level in the bilge
考题
单选题In towing，chocks are used to（）.A
protect the towline from chafingB
secure the end of the towline on the tugC
stop off the towline while retrieving itD
absorb shock loading on the towline
考题
单选题The biggest problem encountered when towing bridle legs are too short is（）.A
retrievalB
adjusting tensionC
excessive strainD
hookup to main towline
考题
单选题When should you conduct a visual inspection of your towline? （）A
Whenever its serviceability is in doubtB
In accordance with the manufacturer's recommendationC
At least once a monthD
All of the above
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 factor(s) might indicate that a towline should be removed from service? （）A
Visible damage to the towline，including fishhooksB
Measurements showing a decrease in diameterC
A surface condition of corrosion and discolorationD
All of the above
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In a combination chain and wire rope mooring system，the anchor chain is deployed at the anchor end of the line to（）.A
increase fatigue life of the systemB
reduce the time to retrieve the lineC
increase the holding powerD
reduce the catenary
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To reduce the amount of catenary you may（）.A
shorten the hawser or increase the tug's speedB
lengthen the hawser or reduce the tug's speedC
place your tug in ironsD
make a sharp turn
考题
单选题The main reason a long towline is used during an oceantow is that（）.A
a margin of safety is provided should the line partB
the towline will wear more evenlyC
there will be less stress on the towlineD
a slight increase in speed will be realized
考题
单选题A term used to describe the dip in a towline that acts as a shock absorber is（）.A
catenaryB
stepC
shock dipD
bight
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The major components which determine the length of a catenary in a deployed anchor cable are water depth，cable weight，and（）.A
cable tensionB
water temperatureC
bottom conditionsD
water density
考题
单选题The holding power of an anchor at a given scope of cable increases when the（）.A
amount of chain lying along the bottom increasesB
length of the catenary is reducedC
mooring line tension is increasedD
amount of chain lying along the bottom decreases
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 that veers to the side on the end of the towline is said to（）.A
yawB
surgeC
swayD
swing
考题
单选题If the towline parts，you should（）.A
start towing by pushing aheadB
abandon the towing vesselC
retrieve the tow bridleD
relieve strain on the retrieving line
考题
单选题The most doubtful and unpredictable factor in a mooring system is the（）.A
ability of the anchors to hold in a seabedB
anchor chain catenary lengthC
variability of the fairleadD
angle of the flukes
考题
单选题It is good practice to use long towlines for ocean tows because the（）.A
wear on the towline is equalizedB
weight of the towline increases the towing forceC
dip in the towline absorbs shock loadsD
danger of overriding is reduced
考题
单选题Catenary as applied to tow lines denotes the（）.A
dip of the lineB
stretch of the lineC
strain on the lineD
length of the line
考题
单选题Tugs sometimes shackle a length of chain in the towline in order to（）.A
take the wear should the towline drag bottomB
assure that if the towline is overstressed it will part close to the bridleC
prevent the towline from whipping should it partD
put spring in the towline
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