航海英语磁罗经与陀螺罗经的使用章节练习(2019.04.30)

单项选择题
The variation for most given areas undergoes（）change，the amount of which is also noted on charts.
A.an annual
B.a constant
C.a variable
D.an unstable
单项选择题
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
单项选择题
The gyrocompass error resulting from your vessel’s movement in OTHER than an east-west direction is called（）.
A.damping error
B.ballistic deflection
C.quadrantal error
D.speed error
单项选择题
Knowing the compass heading that is 90°to the side of a ship will enable the operator of a survival craft to initially steer（）.
A.into the wind
B.away in fire and smoke
C.directly to the standby boat
D.directly to the nearest land
单项选择题
The greatest directive force is exerted on the magnetic compass when the（）.
A.needles are nearly in line with the meridian
B.vessel is near the magnetic poles
C.variation is near zero
D.vessel is near the magnetic equator
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
The Flinders bar on a magnetic compass compensates for the（）.
A.Induced magnetism in vertical soft iron
B.Induced magnetism in horizontal soft iron
C.Permanent magnetism in ship's steel
D.Vessel's inclination from the vertical
单项选择题
The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron. This changes with latitude. What corrects for this coefficient of the deviation? （）
A.The Flinders bar
B.The heeling magnet
C.Quadrantal soft iron spheres
D.Bar magnets in the binnacle
单项选择题
Which magnetic compass corrector（s）can be set while the vessel is on a heading of magnetic north or magnetic south（）.
A.Quadrantal spheres
B.Heeling magnets
C.Flinders bar
D.Fore-and-aft magnets
单项选择题
The standard magnetic compass heading differs from the true heading by（）.
A.compass error
B.latitude
C.variation
D.deviation