海船船员考试
单选题When a magnetic compass is not in use for a prolonged period of time it should（）.A be shielded from direct sunlightB be locked into a constant headingC have any air bubbles replaced with nitrogenD have the compensating magnets removed
题目
be shielded from direct sunlight
be locked into a constant heading
have any air bubbles replaced with nitrogen
have the compensating magnets removed
相似问题和答案
第1题：
When an azimuth of the Sun has been taken and the deviation of the standard magnetic compass computed，the watch officer should record the results ______.
A.in the vessel's Official Logbook
B.on the compass deviation card
C.in the compass deviation log
D.on a Napier diagram
第2题：
Deviation is the angle between the ______.
A.true meridian and the axis of the compass card
B.true meridian and the magnetic meridian
C.magnetic meridian and the axis of the compass card
D.axis of the compass card and the degaussing meridian
自差是磁子午线与罗经盘的轴之间的角。
第3题：
Which one of the followings is incorrect about magnetic compass?______.
A.The magentic compass is compulsory on my vessel
B.The magentic compass is prone to error
C.The magentic compass is always placed inside steel constructions
D.The magentic compass needs to be calibrated to compensate for local magnetic distortion
关于磁罗经下面哪项是不正确的？磁罗经总是放在刚性结构里面。
第4题：
Magnetic dip is a measurement of the angle between the ______.
A.geographic pole and the magnetic pole
B.lubber’s line and true north
C.horizontal and the magnetic line of force
D.compass heading and the magnetic heading
磁倾角是地平和磁力线夹角的测量。
第5题：
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
磁罗经自差是磁北与罗北之间的差角。
第6题：
Which magnetic compass corrector（s）CANNOT be set on a heading of magnetic east or magnetic west ________．
A.Heeling magnet
B.Flinders bar
C.Fore-and-aft magnets
D.All of the above can be set on magnetic east or magnetic west headings
第7题：
If a magnetic compass is not affected by any magnetic field other than the Earth’s which statement is TRUE?______.
A.Compass error and variation are equal
B.Compass north will be true north
C.Variation will equal deviation
D.There will be no compass error
若磁罗经不受除了地磁意外的任何磁场的影响，哪个叙述是对的？罗经差和磁差一样的。
第8题：
On a nautical chart，the inner ring of a compass rose indicates ______.
A.true directions
B.compass error
C.deviation
D.magnetic directions
第9题：
Magnetic heading differs from compass heading by______．
A.compass error
B.true heading
C.variation
D.Deviation
磁首向不同于罗经首向在于自差。
第10题：
magnetism from the earth's magnetic field
misalignment of the compass
magnetism within the vessel
a dirty compass housing