更多"Apparent altitude is sextant altitu"的相关试题:
[单项选择]When using horizontal sextant angles of three objects to fix your position，an indeterminate position will result in which situation（）.
A. The objects lie in a straight line
B. The vessel is inside of a triangle formed by the objects
C. The vessel is outside of a triangle formed by the objects
D. A circle will pass through your position and the three objects
[单项选择]A sextant having an index error that is off the arc has a（）.
A. positive correction
B. dip error
C. negative correction
D. semidiameter error
[单项选择]A marine sextant has the index arm set at zero and the reflected image of the horizon forms a continuous line with the actual image. When the sextant is rotated about the line of sight the images separate. The sextant has（）.
A. error of perpendicularity
B. side error
C. prismatic error
D. centering error
[单项选择]Charts should be corrected by using information published in the（）.
A. Light List
B. American Practical Navigator
C. Notice to Mariners
D. Coast Pilot
[单项选择]What is the major advantage of high altitude observations?（）
A. Errors due to unusual parallax are eliminated
B. The same body can be used for a fix from observations separated by several minutes
C. The declination is the only information needed from the almanac
D. The semidiameter correction of the sextant altitude is eliminated
[单项选择]Apparent time is based on（）.
A. a fictitious sun moving along the celestial equator
B. the visible sun moving along the ecliptic
C. the Moon's motion in relation to the Sun
D. the movement of the first point of Aries
[单项选择]Apparent wind speed blowing across a vessel under tow can be measured by a(n)（）.
A. barometer
B. wind vane
C. anemometer
D. thermometer
[单项选择]An aneroid barometer reading should be corrected for differences in（）.
A. elevation
B. temperature
C. wind speed
D. latitude
[单项选择]When the wave period and the apparent rolling period are the same（）.
A. synchronous rolling occurs
B. roll period decreases
C. roll period increases
D. roll amplitude is dampened
[单项选择]It is apparent that there was not sufficient depth of water（）and I claim that the estimated arrival draft as radioed to the agent to report to you was a close one.
A. for my vessel crossing safely
B. my vessel is to cross safely
C. for my vessel to cross safely
D. for my vessel's crossing safely
[单项选择]Apparent wind speed blowing across a ship under tow can be measured by a(n)（）.
A. barometer
B. wind vane
C. anemometer
D. thermometer
[单项选择]Upon underwater detection，there were no apparent defects on the bottom plates，bilge keels，rudder and propeller of the said vessel.This kind of wording usually appeared on（）.
A. ship surveyor's report
B. a ship's certificate
C. a cargo inspection report
D. a diver survey report
[单项选择]The distance from the still water level (corrected for tides and storm surge) to the bottom of the hull of a ship is the（）.
A. air gap
B. freeboard
C. penetration
D. water depth
[单项选择]There are still（）charts to be corrected.
A. few
B. a few
C. little
D. a little
[单项选择]The apparent wind can be zero when the true wind is from（）.
A. ahead and equal to the ship's speed
B. astern and equal to the ship's speed
C. ahead and equal to twice the ship's speed
D. astern and equal to twice the ship's speed
[单项选择]Upon underwater detection, there were no apparent defects on the bottom plates, bilge keels,rudder and propeller of the said vessel. This kind of wording usually appeared on（）.
A. ship surveyor's report
B. a ship's certificate
C. a cargo inspection report
D. a dive survey report
[单项选择]Which condition represents the appropriate time for setting off distress flares and rockets? （）
A. Only when there is a chance of their being seen by rescue vessels
B. At half hour intervals
C. At one hour intervals
D. Immediately upon abandoning the vessel
[单项选择]The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.
A. must be from dead ahead
B. speed must be zero
C. must be from dead astern
D. must be on the beam
