單項選擇題It may be found that,in certain circumstances,radar beacon emissions can cause()with the normal radar display,particularly at close range.

A.unwanted interference
B.unexpected figures
C.abnormal data
D.unwanted information


您可能感興趣的試卷

你可能感興趣的試題

1.單項選擇題PPI is().

A.a plan-position indicator system
B.pulse-plan integration
C.pulse-pulse input
D.power-plan input

2.單項選擇題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

3.單項選擇題Radar reflectors are required for().

A.all fishing vessels over 39 feet in length
B.sail-propelled fishing vessels
C.all fishing vessels of less than 200 GT
D.wooden hull fishing vessels with a poor radar echo

4.單項選擇題Which condition indicates that your radar needs maintenance?()

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

6.單項選擇題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

7.單項選擇題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

8.單項選擇題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

9.單項選擇題Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope().

A.Echoes from a buoy
B.Own ship's marker
C.Echo from a ship on the same course at the same speed
D.Echo from a ship on a reciprocal course at the same speed

10.單項選擇題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