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


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1.單項選擇題Which statement is true concerning a vessel equipped with operational radar?（）.

A.The Master of the vessel must be on the bridge when the radar is in use
B.The radar equipment is only required to be used in restricted visibility
C.The use of a radar excuses a vessel from the need of a look-out
D.This equipment must be used to obtain early warning of risk of collision

3.單項選擇題（）is not a job of the radar antenna.

A.To receive the high-frequency pulses from the transmitter
B.To focus the pulses into a beam，and send them into space
C.To pick up reflected pulses coming from objects that have been struck by the beam
D.To reflect microwaves

4.單項選擇題Your ARPA has been tracking a target and has generated the targets course and speed.The radar did not receive a target echo on its last two scans due to the weather.What should you expect under these circumstances（）.

A.The ARPA will generate data as if the target was still being tracked by radar
B.The ARPA will give an audible and/or visual lost target alarm
C.The ARPA will generate data based on sea return echoes from the vicinity where the target was lost
D.The ARPA has lost all memory of the target and must recompute the target data

5.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

7.單項選擇題You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.

A.stop your engines
B.sound two prolonged blasts of the whistle
C.sound the danger signal
D.slow to bare steerageway

8.單項選擇題Your ARPA has automatic speed inputs from the log．Due to currents，the log is indicating a faster speed than the speed over the ground.What should you expect under these circumstances（）.

A.The generated CPA will be less than the actual CPA
B.The generated TCPA will be later than the actual TCPA
C.The range of initial target acquisition will be less than normal
D.The targets true course vector will be in error

9.單項選擇題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

10.單項選擇題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