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单选题
The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.
A
be more suitable for river and harbor navigation
B
provide better range performance on low lying targets during good weather and calm seas
C
have a wider horizontal beam width
D
have more sea return during rough sea conditions
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考题
Radar beacons are transmitters designed to produce a ___ on the screens of ship’s radar sets.A.incorrect imageB.distinctive imageC.pictorial imageD.pictographic image
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The 10-cm radar as compared to a 3-cm radar of similar specifications will ______.A.be more suitable for river and harbor navigationB.provide better range performance on low lying targets during good weather and calm seasC.have a wider horizontal beam widthD.have more sea return during rough sea conditions
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The closest point of approach ( CPA ) of a contact on a relative motion radar may be determined ______.A.immediately when the contact is noted on radarB.only if the radar scope is watched constantlyC.after the contact has been marked at least twiceD.by an occasional glance at the radar
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The common way to obtain your ship’s position is ______.A.keeping a close watch and lookoutB.taking a radar range and bearingC.observing a radar target and listening to signalsD.keeping a well clear caution
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My radar is not working．I require shorebased radar assistance．Is shorebased radar assistance ________ ？A.usedB.availableC.in useD.can be used
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The description Racon beside an illustration on a chart would mean a ______.A.radar conspicuous beaconB.circular radiobeaconC.radar transponder beaconD.radar calibration beacon
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Which aid is NOT marked on a chart with a magenta circle?A.Aero lightB.Radar stationC.Radar transponder beaconD.Radiobeacon
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In order to insure that the racon signal is visible on your 3 cm radar, the ______.A.10 cm radar should be placed on stangby or turned offB.gain control should be turned to maximumC.radar should be stabilized, head upD.rain clutter control should be off but, if necessary, may be on low
考题
单选题Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.A
incorrect imageB
distinctive imageC
pictorial imageD
pictographic image
考题
单选题Which conditions will normally cause a SART to operate in the active mode?（）A
It will respond only to interrogation by 9-Ghz radar signalsB
A SART will normally respond to interrogation from a searching vessel's radar if the radar antenna is at least 15 meters highC
A SART will normally respond to interrogation from a searching aircraft's radar if the radar's output power is at least 10，000 watts and the aircraft is at a height of 3000 feet and within 30 nautical milesD
All of the above
考题
单选题It may be found that，in certain circumstances，radar beacon emissions can cause（）with the normal radar display，particularly at close range.A
unwanted interferenceB
unexpected figuresC
abnormal dataD
unwanted information
考题
单选题In determining a safe speed（）shall not be among those taken into account.A
the characteristics，efficiency and limitation of the radar equipmentB
any constraints imposed by the radar range scale in useC
the effect on radar detection of the sea state，weather and other sources of interferenceD
the safe working load of the cranes both on board and ashore
考题
单选题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 useB
The radar equipment is only required to be used in restricted visibilityC
The use of a radar excuses a vessel from the need of a look-outD
This equipment must be used to obtain early warning of risk of collision
考题
单选题What would most likely prevent a SART’s signal from being detected?（）A
Signal absorption by the ionosphereB
Heavy sea swellsC
The rescue personnel were monitoring the 10-cm radarD
The rescue personnel were monitoring the 3-cm radar
考题
单选题My radar is not working.I require shore based radar assistance.Is shore based radar assistance（）?A
usedB
availableC
in useD
can be used
考题
单选题Which general statement concerning radar is FALSE?（）.A
Raising the antenna height increases the radar rangeB
The ability of radar to detect objects is unaffected by weather conditionsC
Radar bearings are less accurate than radar rangesD
Radar should be checked regularly during clear weather to ensure that it is operating properly
考题
单选题Which statement concerning the operation of radar in fog is TRUE?（）A
Radar ranges are less accurate in fogB
Navigation buoys will always show up on radarC
A sandy beach will show up clearer on radar than a rocky cliffD
Small wooden boats may not show up on radar
考题
单选题The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.A
give better range performance in rain，hail，etcB
display small targets in a mass of dense sea clutter at a greater rangeC
have less sea return in choppy rough seasD
display a more map like presentation for inshore navigation
考题
单选题Small floes of rough，hummocky sea ice capable of damaging a vessel（）.A
can usually be detected by radar in a smooth sea at a range of 4 to 6 kilometersB
are indistinguishable from sea return on the PPIC
are invisible to radar when covered with a thick layer of snowD
are usually seen at night before they are close enough to provide a radar echo
考题
单选题The shoreline along Rocky Point should give a good radar return because（）.A
the shore is bluff and rockyB
of offshore exposed rocksC
submerged reefs cause prominent breakersD
the lookout tower is marked with radar reflectors
考题
单选题You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）A
Your speed must be reduced to bare steerage waysB
A look-out is not required if the radar is onC
The radar should always be kept on a short-range scaleD
Fog signals are only required when a vessel is detected by radar
考题
单选题In order to ensure that a RACON signal is displayed on the radar，you should（）.A
increase the brilliance of the PPI scopeB
turn off the interference controls on the radarC
use the maximum available range settingD
increase the radar signal output
考题
单选题If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.A
Only a radar expert can determine if the radar is operatingB
All radars have indicator lights and alarms to signal improper operationC
A radar range compared to the actual range of a known object can be used to check the operation of the radarD
The radar resolution detector must be energized to check the radar
考题
单选题The closest point of approach (CPA) of a contact on a relative motion radar may be determined（）.A
immediately when the contact is noted on radarB
only if the radar scope is watched constantlyC
after the contact has been marked at least twiceD
by an occasional glance at the radar
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单选题Which statement is TRUE concerning a vessel equipped with operational radar?（）.A
She must use this equipment to obtain early warning of risk of collisionB
The use of a radar excuses a vessel from the need of a look-outC
The radar equipment is only required to be used in restricted visibilityD
The safe speed of such a vessel will likely be greater than that of vessels without radar
考题
单选题When using the radar for navigating（）.A
the best fix is obtained by using a tangent bearing and a rangeB
and using two radar ranges for a fix，the objects of the ranges should be close to reciprocal bearingsC
and using ranges，the most rapidly changing range should be measured lastD
and crossing a radar range of one object with the visual bearing of a second object，the two objects should be 80°to 110°apart
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