第二章The correct method of switching off a marine radar is to turn power switch to ____ position first, then to ______ position.
D.close / standby
A.off / standby
C.standby / close
答案:B.standby / off
The abbreviation PPI in the Sperry Collision Avoidance System means ______.
B.plain position indicator
A.plan position indicator
D.policy proof of interest
答案:A.plan position indicator
Radar makes it possible and much safer for us to sail __.
C.in the open sea
A.in dense fog
B.in boisterous weather
答案:A.in dense fog
The 10-cm radar as compared to a 3-cm radar of similar specifications will ______.
D.have more sea return during rough sea conditions
B.provide better range performance on low lying targets during good weather and calm seas
C.have a wider horizontal beam width
答案:C.have a wider horizontal beam width
The ARPA may swap targets when automatically tracking if two targets ______
A.are tracked on reciprocal bearings
C.are tracked on the same bearing
D.pass close together
答案:D.pass close together
The common way to obtain your ship’s position is ______.
A.keeping a close watch and lookout
D.keeping a well clear
B.taking a radar range and bearing
答案:B.taking a radar range and bearing
The radio waves used for radar are very short，only______long．
A.a few centimeters
C.a few meters
B.a few fathoms
答案:A.a few centimeters
When hitting a solid object such as a ship or an airplane, the radar waves are reflected back______ they came.
C.by the way
B.the way
A.in the way
答案:D.through the path
When using a radar in a unstabilized mode, fixes are determined most easily from ______.
A.center bearings
B.tangent bearings
C.ranges
答案:C.ranges
Which general statement concerning radar is FALSE?
A.raising the antenna height increases the radar range
D.radar should be checked regularly during clear weather to ensure that it is operating properly
C.radar bearing are less accurate than radar range
答案:B.the ability of radar to detect objects is unaffected by weather conditions
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