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单选题
The soundings on the chart are based on the depth of water available at （）.
A
mean low water
B
mean lower low water
C
mean high water
D
mean high water springs
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The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
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The recording fathometer produces a graphic record of the ______．A.bottom contour only up to depths of 100 fathomsB.depth underneath the keel against a time baseC.contour of the bottom against a distance baseD.depth of water against a distance base
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All echo-sounders can measure the ______．A.Actual depth of waterB.Actual depth of water below keelC.Average depth from waterline to hard bottomD.Average depth of water to soft bottom
考题
Chart depth is the ______.A.vertical distance from the tidal datum to the ocean bottom, plus the height of tideB.vertical distance from the tidal datum to the ocean bottomC.average height of water over a specified period of timeD.average height of all low waters at a place
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Chart depth is the ______.A.vertical distance from the chart sounding datum to the ocean bottom, plus the height of tideB.vertical distance from the chart sounding datum to the ocean bottomC.average height of water over a specified period of timeD.average height of all low waters at a place
考题
In determining the scope of anchor line to pay out when anchoring a small boat, one must consider the ______.A.charted depth of water onlyB.depth of water, including tidal differencesC.time and date of anchoringD.type of anchor being used
考题
In what units are heights and soundings in the chart? They are in ______.A.meters and fathomsB.fathoms and metersC.meter and fathomD.fathom and meter
考题
Many of the soundings shown on the chart are______inadequate and often very poor surveys ．Undue reliance should not be placed upon them．A.drived fromB.derived byC.derived fromD.drived by
考题
单选题The heights and soundings of Admiralty chart are expressed（）in Fathoms（）in Meters．A
either，orB
neither，norC
another，norD
other，or
考题
单选题When anchoring,it is a common rule of thumb to use a length of chain（）.A
five to seven times the depth of waterB
seven to ten times the depth of waterC
twice the depth of waterD
twice the depth of water plus the range of tide
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单选题In moderate wind and current what should be the length of chain with a single anchor?（）A
5 times the depth of the water in good holding groundB
10 times the depth of the water in shallow waterC
2 times the depth of the water in poor holding groundD
8 times the depth of the water in deep water
考题
单选题Air gap is the vertical distance between the bottom of the hull and the（）.A
still water levelB
wave crestC
wave crest plus the charted water depth and tidal correctionsD
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考题
单选题The height of tide is the （）.A
depth of water at a specific time due to tidal effectB
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difference between the depth of the water and the high water tidal levelD
difference between the depth of the water at high tide and the depth of the water at low tide
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单选题What should you apply to a fathometer reading to determine the depth of water?（）A
Subtract the draft of the vesselB
Add the draft of the vesselC
Subtract the sea water correctionD
Add the sea water correction
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单选题The distance between the surface of the water and the tidal datum is the （）.A
range of tideB
height of tideC
charted depthD
actual water depth
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单选题Stand of the tide is that time when（）.A
the vertical rise or fall of the tide has stoppedB
slack water occursC
tidal current is at a maximumD
the actual depth of the water equals the charted depth
考题
单选题In bad weather，what length of chain should be used with a single anchor? （）A
3 times the depth of waterB
6 times the depth of waterC
10 times the depth of waterD
15 times the depth of water
考题
单选题The maneuvering information required to be posted in the wheelhouse must be based on certain conditions.Which of the following is NOT one of these conditions（）A
The hull must be cleanB
There must be calm weather – wind 10 knots or less and a calm seaC
There must be no currentsD
The depth of the water must be at least one and one-half times the draft
考题
单选题Charted depth is the （）.A
vertical distance from the chart sounding datum to the ocean bottom，plus the height of tideB
vertical distance from the chart sounding datum to the ocean bottomC
average height of water over a specified period of timeD
average height of all low waters at a place
考题
单选题All echo-sounders can measure the（）.A
actual depth of waterB
actual depth of water below keelC
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单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）A
Four times the depth of waterB
Two and one-half times the depth of waterC
Five to seven times the depth of waterD
Fifteen times the depth of water
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