航海英语航海仪器章节练习(2018.01.16)

单项选择题
The lubber’s line of a magnetic compass（）.
A.always shows true north direction
B.indicates the vessel's heading
C.is always parallel to the vessel's transom
D.is located on the compass card
单项选择题
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
单项选择题
When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of（）.
A.10 meters
B.20 meters
C.50 meters
D.100 meters
单项选择题
The reaction of a gyrocompass to an applied force is known as（）.
A.precession
B.earth rate
C.gyroscopic inertia
D.gravity effect
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
At the master gyrocompass，the compass card is attached to the（）.
A.spider element
B.sensitive element
C.link arm
D.pickup transformer
单项选择题
Radar makes the most accurate determination of the（）.
A.direction of a target
B.distance to a target
C.size of a target
D.shape of a target
单项选择题
While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position（）.
A.A decreasing reading on loran pair 9960-X
B.The bearing of Wolf Trap Light changing to the right
C.Increasing soundings
D.The bearing of Wolf Trap Light changing to the left
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
A tall object with a light on or near the shore，to act as a guide or warning to mariners is called（）.
A.beam
B.radar
C.light beacon
D.reflector