單項選擇題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


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1.單項選擇題The magnetism in the various structures of a ship changing as a result of cruising，vibration，or aging is termed（）.

A.permanent magnetism
B.subpermanent magnetism
C.induced magnetism
D.variable magnetism

2.單項選擇題This induced magnetism（）the permanent magnetism already present in the ship.

A.will add to
B.will subtract from
C.may add to or subtract from
D.will not change

3.單項選擇題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

4.單項選擇題What is the basic principle of the magnetic compass（）.

A.Magnetic materials of the same polarity repel each other and those of opposite polarity attract
B.The Earth's magnetic lines of force are parallel to the surface of the Earth
C.Magnetic meridians connect points of equal magnetic variation
D.The compass needle（s）will，when properly compensated，lie parallel to the isogonic lines of the Earth

5.單項選擇題Variation is the angular measurement between（）.

A.compass north and magnetic north
B.compass north and true north
C.magnetic meridian and the geographic meridian
D.your vessel's heading and the magnetic meridian

6.單項選擇題When relieving the helm，the new helmsman should know the（）.

A.Course per magnetic steering compass
B.Gyro error
C.Variation
D.Maximum rudder angle previously used

8.單項選擇題When changing from a compass course to a true course you should apply（）.

A.variation
B.deviation
C.variation and deviation
D.a correction for the direction of current set

10.單項選擇題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