單項(xiàng)選擇題When using the ARPA in heavy rain，which action should you take? （）

A.Increase the radar gain to pick up weak echoes through the rain
B.Increase the STC setting to reduce close-in spurious signals
C.Navigate as though the effective range of the radar has been reduced
D.Increase the range of the inner and outer guard rings


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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

5.單項(xiàng)選擇題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