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