单项选择题

Which statement is TRUE concerning a vessel equipped with operational radar?（）.

A.She must use this equipment to obtain early warning of risk of collision
B.The use of a radar excuses a vessel from the need of a look-out
C.The radar equipment is only required to be used in restricted visibility
D.The safe speed of such a vessel will likely be greater than that of vessels without radar

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单项选择题Which statement concerning the operation of radar in fog is TRUE?（）

A.Radar ranges are less accurate in fog
B.Navigation buoys will always show up on radar
C.A sandy beach will show up clearer on radar than a rocky cliff
D.Small wooden boats may not show up on radar

单项选择题Which statement about an estimated position is TRUE?（）

A.It is more reliable than a fix based on radar bearings
B.It may be based on a single LOP or questionable data
C.When a 3-LOP fix plots in a triangle，the center of the triangle is the estimated position
D.It is usually based on soundings

单项选择题Which procedure(s) shall be used to determine risk of collision? （）

A.Watching the compass bearing of an approaching vessel
B.Systematic observation of objects detected by radar
C.Long-range radar scanning
D.All of the above

单项选择题Which general statement concerning radar is FALSE?（）.

A.Raising the antenna height increases the radar range
B.The ability of radar to detect objects is unaffected by weather conditions
C.Radar bearings are less accurate than radar ranges
D.Radar should be checked regularly during clear weather to ensure that it is operating properly

单项选择题Which condition indicates that your radar needs maintenance?（）

A.Serrated range rings
B.Indirect echoes
C.Multiple echoes
D.Blind sector