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______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
参考答案
更多 “ ______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 ” 相关考题
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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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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
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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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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
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______ 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
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Which of the following is a multimedia device?（）A、Biometric deviceB、MouseC、CamcorderD、Infrared scanner
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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.
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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
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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（）.A
stop your enginesB
sound two prolonged blasts of the whistleC
sound the danger signalD
slow to bare steerageway
考题
单选题You hear the fog signal of another vessel forward of your beam.Risk of collision may exist.You MUST（）.A
Reduce speed to bare steeragewayB
Stop your enginesC
Begin a radar plotD
All of the above
考题
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 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
考题
单选题When you turn on the fast time constant (differentiator) control of a radar it will（）.A
enhance weak target echoes and brighten them on the PPIB
reduce clutter over the entire PPI by shortening the echoesC
only suppress weak targets to a limited distance from the ship (sea clutter)D
reduce the beam width to provide a map-like presentation for navigation
考题
单选题A navigator fixing a vessel’s position by radar （）.A
can use radar information from one object to fix the positionB
should never use radar bearingsC
should only use radar bearings when the range exceeds the distance to the horizonD
must use information from targets forward of the beam
考题
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（）.A
stop your enginesB
sound two prolonged blasts of the whistleC
sound the danger signalD
slow to bare steerageway
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
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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
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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
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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
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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.A
near the ship’s whistleB
on the funnelC
in the vicinity of radio aerialsD
near the radar scanner
考题
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?（）.A
Their bearing is almost constant，even when the true bearing of the contact changes appreciablyB
They always appear on a bearing of 90°from the true bearing of the contactC
The indirect echoes usually appear in shadow sectorsD
When plotted，their movements are usually abnormal
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（）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
考题
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? （）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
考题
单选题Which statement concerning maneuvering in restricted visibility is FALSE?（）.A
A vessel which cannot avoid a close-quarters situation with a vessel forward of her beam shall reduce her speed to bare steeragewayB
A vessel which hears a fog signal forward of her beam shall stop her enginesC
A vessel which hears a fog signal forward of the beam shall navigate with cautionD
If a vessel determines by radar that a close-quarters situation is developing，she shall take avoiding action in ample time
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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
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单选题In vessel construction, beam are transverse girders which provide support to（）.A
bulkheadsB
deckhouse structuresC
decksD
vertical frames
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