默认题库 - 雷达及ARPA的使用

单选题

The officer of the watch should use radar when appropriate and at all times in（）waters.

A. congesting
B. congested
C. congestion
D. congest

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单选题

The radar control used to reduce sea return at close ranges is the（）.

A. gain control
B. sensitivity time control
C. fast time constant
D. pulse length control

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单选题

The shoreline along Rocky Point should give a good radar return because（）.

A. the shore is bluff and rocky
B. of offshore exposed rocks
C. submerged reefs cause prominent breakers
D. the lookout tower is marked with radar reflector

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单选题

To determine if risk of collision exists，a vessel which is fitted with radar must use（）.

A. radar scanning
B. radar plotting
C. compass bearings
D. All of the above

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单选题

What is TRUE of the history display of a target’s past positions on an ARPA?（）

A. It provides a graphic display to emphasize which vessel is on a collision course
B. In the true presentation，it provides a quick visual check to determine if a vessel has changed course
C. The display is one of the primary inputs and must be in use when using the trial maneuver capability
D. It provides a graphic display of a target vessel's relative course，speed，and CPA

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单选题

What is TRUE when operating in fog and other vessels are detected by radar?（）.

A. You should make an ample change to port for a vessel crossing on the starboard bow
B. You should maneuver in ample time if a close-quarters situation is developing
C. You should determine the course and speed of all radar contacts at six minute intervals
D. Long-range scanning will provide early warning of ALL other vessels within the radar's range

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单选题

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

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单选题

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 vessel

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单选题

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 retur

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单选题

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 ring

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