单项选择题

When using an ARPA，what should you consider in order to evaluate the information displayed?（）

A.The target vessel's generated course and speed are based solely on radar inputs
B.Navigational constraints may require a target vessel to change course
C.The trial maneuver feature will automatically determine a course that will clear all targets
D.You cannot determine if a small target has been lost due to sea return

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单项选择题When using a radar in a unstabilized mode，fixes are determined most easily from（）.

A.center bearings
B.tangent bearings
C.ranges
D.objects that are close aboard

单项选择题When navigating in thick fog with the radar on，you should（）.

A.station the look-out in the wheelhouse to keep a continuous watch on the radar
B.secure the sounding of fog signals until a vessel closes within five miles
C.station a look-out as low down and far forward as possible
D.keep the radar on the shortest available range for early detection of approaching vessels

单项选择题When hitting a solid object such as a ship or an airplane，the radar waves are reflected back （）they came.

A.in the way
B.the way
C.by the way
D.through the path

单项选择题What will cause the ARPA to emit a visual alarm，audible alarm，or both?（）

A.An acquired target entering into a guard zone
B.A tracked target lost for one radar scan
C.A tracked target entering your preset CPA-TCPA limits
D.A target being initially detected within a guard zone

单项选择题What provides little or no indication that a vessel is dragging anchor? （）

A.Increasing radar range to a fixed object ahead
B.Drift lead with the line leading perpendicular to the centerline
C.Vibrations felt by placing a hand on the cable
D.Changing bearings to distant fixed objects abeam