______of a radar is governed by the horizontal beam width of the scanner which depends to a great extent on its physical size．A.Range discriminationB.Bearing discriminationC.Echo discriminationD.Target discrimination
______of a radar is governed by the horizontal beam width of the scanner which depends to a great extent on its physical size．
A.Range discrimination
B.Bearing discrimination
C.Echo discrimination
D.Target discrimination
相关考题：
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
Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to ______.A.the effects of beam widthB.limitations on range resolutionC.the pulse length of the radarD.the multiple-target resolution factor
Which aid is NOT marked on a chart with a magenta circle?A.Aero lightB.Radar stationC.Radar transponder beaconD.Radiobeacon
At 0900，you take the following radar ranges: Watch Hill Point 5.4 miles; Block Island Grace Point 8.3 miles. Which statement is TRUE?A.You are within 3 nautical miles of the coastB.The bottom in the area is sand and gravelC.The fix is indeterminateD.You are governed by the Inland Rules
______ is not a job of the radar antenna．A.To receive the high-frequency pulses from the transmitterB.To focus the pulses into a beam，and send them into spaceC.To pick up reflected pulses coming from objects that have been struck by the beamD.To reflect microwaves
Which of the following is a multimedia device?（）A、Biometric deviceB、MouseC、CamcorderD、Infrared scanner
When installing a new scanner， Windows XP does not automatically recognize the scanner. Which of the following actions should be taken？（）A、Use the Scanners and Cameras Wizard to add the device.B、Enable the scanner in the BIOS.C、Add new printer Wizard.D、Ensure the scanner is not locked.
Can an item balance ever be allowed to be negative？ （）A、 neverB、 alwaysC、 depends on which itemD、 depends on if it is allowed in the Inventory Default settings
单选题You are in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.Astop your enginesBsound two prolonged blasts of the whistleCsound the danger signalDslow to bare steerageway
单选题You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.AReduce speed to bare steeragewayBStop your enginesCBegin a radar plotDAll of the above
单选题The 10-cm radar as compared to a 3-cm radar of similar specifications will（）.Abe more suitable for river and harbor navigationBprovide better range performance on low lying targets during good weather and calm seasChave a wider horizontal beam widthDhave more sea return during rough sea conditions
单选题When you turn on the fast time constant (differentiator) control of a radar it will（）.Aenhance weak target echoes and brighten them on the PPIBreduce clutter over the entire PPI by shortening the echoesConly suppress weak targets to a limited distance from the ship (sea clutter)Dreduce the beam width to provide a map-like presentation for navigation
单选题A navigator fixing a vessel’s position by radar （）.Acan use radar information from one object to fix the positionBshould never use radar bearingsCshould only use radar bearings when the range exceeds the distance to the horizonDmust use information from targets forward of the beam
单选题You are underway in restricted visibility and hear a fog signal forward of the beam. Nothing appears on your radar screen. You must（）.Astop your enginesBsound two prolonged blasts of the whistleCsound the danger signalDslow to bare steerageway
单选题Which statement is true concerning a vessel equipped with operational radar?（）.AThe Master of the vessel must be on the bridge when the radar is in useBThe radar equipment is only required to be used in restricted visibilityCThe use of a radar excuses a vessel from the need of a look-outDThis equipment must be used to obtain early warning of risk of collision
单选题Coral atolls，or a chain of islands at right angles to the radar beam，may show as a long line rather than as individual targets due to （）.Athe effects of beam widthBlimitations on range resolutionCthe pulse length of the radarDthe multiple-target resolution factor
单选题Which general statement concerning radar is FALSE?（）.ARaising the antenna height increases the radar rangeBThe ability of radar to detect objects is unaffected by weather conditionsCRadar bearings are less accurate than radar rangesDRadar should be checked regularly during clear weather to ensure that it is operating properly
单选题Which statement concerning the operation of radar in fog is TRUE?（）ARadar ranges are less accurate in fogBNavigation buoys will always show up on radarCA sandy beach will show up clearer on radar than a rocky cliffDSmall wooden boats may not show up on radar
单选题Can an item balance ever be allowed to be negative？ （）A neverB alwaysC depends on which itemD depends on if it is allowed in the Inventory Default settings
单选题Before wore is commenced（）the officer responsible should ensure that power is shut off and warning notices posted on the bridge and in the machinery spaces.Anear the ship’s whistleBon the funnelCin the vicinity of radio aerialsDnear the radar scanner
单选题An indirect radar echo is caused by a reflection of the main lobe of the radar beam off the observer’s vessel. Which of the following is NOT a characteristic of indirect echoes?（）.ATheir bearing is almost constant，even when the true bearing of the contact changes appreciablyBThey always appear on a bearing of 90°from the true bearing of the contactCThe indirect echoes usually appear in shadow sectorsDWhen plotted，their movements are usually abnormal
单选题If there is any doubt as to the proper operation of a radar，which statement is TRUE?（）.AOnly a radar expert can determine if the radar is operatingBAll radars have indicator lights and alarms to signal improper operationCA radar range compared to the actual range of a known object can be used to check the operation of the radarDThe radar resolution detector must be energized to check the radar
单选题（）is not a job of the radar antenna.ATo receive the high-frequency pulses from the transmitterBTo focus the pulses into a beam，and send them into spaceCTo pick up reflected pulses coming from objects that have been struck by the beamDTo reflect microwaves
单选题At 0900，you take the following radar ranges: Watch Hill Point 5.4 miles; Block Island Grace Point 8.3 miles. Which statement is TRUE? （）AYou are within 3 nautical miles of the coastBThe bottom in the area is sand and gravelCThe fix is indeterminateDYou are governed by the Inland Rules
单选题Which statement concerning maneuvering in restricted visibility is FALSE?（）.AA vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steeragewayBA vessel which hears a fog signal forward of her beam shall stop her enginesCA vessel which hears a fog signal forward of the beam shall navigate with cautionDIf a vessel determines by radar that a close-quarters situation is developing，she shall take avoiding action in ample time
单选题Which statement is TRUE concerning a vessel equipped with operational radar?（）.AShe must use this equipment to obtain early warning of risk of collisionBThe use of a radar excuses a vessel from the need of a look-outCThe radar equipment is only required to be used in restricted visibilityDThe safe speed of such a vessel will likely be greater than that of vessels without radar
单选题In vessel construction, beam are transverse girders which provide support to（）.AbulkheadsBdeckhouse structuresCdecksDvertical frames