更多"When crossing the magnetic equator "的相关试题:
[单项选择]At the magnetic equator there is no induced magnetism in the vertical soft iron because（）.
A. the lines of force cross the equator on a 0°-180°alignment
B. the quadrantal error is 0°
C. there is no vertical component of the Earth's magnetic field
D. the intercardinal headings have less than 1°
[单项选择]When crossing a front,isobars tend to（）.
A. change from smooth curves within the air mass to sharp bends at the front
B. change from sharp bends within the air mass to smooth curves at the front
C. pass smoothly across the front with no change
D. become closer together at the front and pass through in straight lines
[单项选择]When shall the stand-on vessel in a crossing situation take action to avoid the other vessel（）.
A. When a risk of collision exists
B. When action by the give-way vessel alone will not prevent a collision
C. When the bearing to give-way vessel becomes steady
D. When the vessels become less than 1/2 mile apart
[单项选择]When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
A. use the magnets one at a time，putting one in one side and then one on the opposite side，one step higher
B. use the magnets in pairs，starting at the top，with trays at the highest point of travel
C. use the magnets in pairs，from the bottom up，with the trays at the lowest point of travel
D. fill all the trays with magnets，then remove them one-by-one until the deviation is removed
[单项选择]When adjusting a magnetic compass for error，a deviation table should be made（）.
A. before correcting for any deviation
B. after correcting for variation
C. after adjusting the fore-and-aft and athwartships permanent magnets
D. before the quadrantal correctors are placed on the compass
[单项选择]When a magnetic compass is not in use for a prolonged period of time it should（）.
A. be shielded from direct sunlight
B. be locked into a constant heading
C. have any air bubbles replaced with nitrogen
D. have the compensating magnets removed
[单项选择]When placed in a magnetic field, which of the materials listed will maintain the highest permeability?（）
A. Glass
B. Bakelite
C. Soft iron
D. Aluminum
[单项选择]The equator is（）.
A. the primary great circle of the Earth perpendicular to the axis
B. the line to which all celestial observations are reduced
C. the line from which a celestial body's altitude is measured
D. All of the above
[单项选择]A vessel is heading magnetic east and its magnetic compass indicates a heading of 086°. Which action should be taken to remove this error during compass adjustment?（）
A. If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should add some magnets.
B. If the blue ends of the magnets are aft you should lower the fore-and-aft tray
C. If the blue ends of the magnets are aft，and the fore-and-aft tray is at the top，you should reverse the magnets
D. If the blue ends of the magnets are forward，and the fore-and-aft tray is at the bottom，you should add some magnets
[单项选择]A parallel of latitude other than the equator is a（）.
A. great circle
B. loxodromic curve
C. small circle
D. gnomonic curve
[单项选择]A line on the Earth parallel to the equator is a（）.
A. gnomonic curve
B. small circle
C. meridian
D. great circle
[单项选择]Magnetic compass deviation（）.
A. varies depending upon the bearing used
B. is the angular difference between magnetic north and compass north
C. is published on the compass rose on most nautical charts
D. is the angular difference between geographic and magnetic meridians
[单项选择]A position obtained by crossing lines of position taken at different times and advanced to a common time is a(n)（）.
A. running fix
B. dead-reckoning position
C. fix
D. estimated position
[单项选择]In a crossing situation on international waters, a short blast by the give-way vessel indicates that the vessel（）.
A. is holding course and speed
B. is turning to starboard
C. intends to pass port to port
D. will keep out of the way of the stand-on vessel
[单项选择]Conditions for crossing a rough bar are usually best at （）.
A. low water slack
B. high water slack
C. high water ebb
D. high water flood
[单项选择]The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
A. Overhead power lines
B. Louisiana-Mississippi ferry crossings
C. Two railroad trestles
D. Two submerged oil pipelines
