航海英语磁罗经与陀螺罗经的使用章节练习(2018.02.01)

单项选择题
What is the name of the movable，radial guide line used to measure direction on a radar?（）
A.Compass rose
B.Cursor
C.Plan position indicator
D.Variable range marker
单项选择题
The difference between magnetic heading and compass heading is called（）.
A.variation
B.deviation
C.compass error
D.drift
单项选择题
Which statement about the Flinders bar of the magnetic compass is CORRECT（）.
A.It compensates for the error caused by the vertical component of the Earth's magnetic field
B.It compensates for error caused by the heeling of a vessel
C.It compensates for quadrantal deviation
D.It is only needed in equatorial waters
单项选择题
Variation in a compass is caused by（）.
A.Worn gears in the compass housing
B.Magnetism from the earth's magnetic field
C.Magnetism within the vessel
D.Lack of oil in the compass bearings
单项选择题
The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.
A.north magnetic pole
B.south magnetic pole
C.magnetic prime vertical meridian
D.magnetic equator
单项选择题
The compass error of a magnetic compass that has no deviation is（）.
A.zero
B.equal to variation
C.eliminated by adjusting the compass
D.constant at any geographical location
单项选择题
Which compensates for errors introduced when the vessel heels over（）.
A.The soft iron spheres on the arms of the binnacle
B.Magnets placed in trays inside the binnacle
C.A single vertical magnet beneath the compass
D.The Flinders bar
单项选择题
Any piece of metal on becoming magnetized will develop regions of concentrated magnetism called（）.
A.flux
B.poles
C.magnets
D.azimuth
单项选择题
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
A.nonmagnetic
B.weatherproof
C.corrosion resistant
D.capable of being permanently affixed to the vessel
单项选择题
The quadrantal spheres are used to（）.
A.remove deviation on the intercardinal headings
B.remove deviation on the cardinal compass headings
C.remove heeling error
D.compensate for induced magnetism in vertical soft iron