更多"（）is not a job of the radar antenna"的相关试题:
[单项选择]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
[单项选择]The 3-cm radar as compared to a 10-cm radar with similar specifications will（）.
A. give better range performance in rain，hail，etc
B. display small targets in a mass of dense sea clutter at a greater range
C. have less sea return in choppy rough seas
D. display a more maplike presentation for inshore navigation
[单项选择]Radar beacons are transmitters designed to produce a（）on the screens of ship’s radar sets.
A. incorrect image
B. distinctive image
C. pictorial image
D. pictographic image
[单项选择]I（）shorebased radar assistance.
A. ask
B. look for
C. require
D. in need of
[单项选择]The radar component that produces the synchronizing signal and triggers the indicator sweep is which of the following?（）.
A. transmitter
B. antenna system
C. indicator
D. modulator
[单项选择]Which statement concerning the operation of radar in fog is TRUE?（）
A. Radar ranges are less accurate in fog
B. Navigation buoys will always show up on radar
C. A sandy beach will show up clearer on radar than a rocky cliff
D. Small wooden boats may not show up on radar
[单项选择]Details of coast radio stations and radar stations can be found in（）.
A. Admiralty Chart
B. Admiralty Light list
C. Admiralty List of Radio Signals
D. Admiralty Notices to Mariners
[单项选择]Vessel required to have an Automatic Radar Plotting Aid must have a device to indicate the（）.
A. speed of the vessel over the ground or through the water
B. distance to the next port
C. time of the next navigational satellite pass
D. None of the above
[单项选择]Which of the following radar contacts will present the most immediate danger?（）.
A. A vessel on the starboard bow whose bearing is changing and range is decreasing
B. A vessel on the starboard bow whose bearing is steady and range is increasing
C. A vessel on the port bow whose bearing is steady and range is decreasing
D. A vessel on the port bow whose bearing is changing to the left and range decreasing
[单项选择]Radar reflectors are required for（）.
A. all fishing vessels over 39 feet in length
B. sail-propelled fishing vessels
C. all fishing vessels of less than 200 GT
D. wooden hull fishing vessels with a poor radar echo
[单项选择]Radar makes the most accurate determination of the（）.
A. direction of a target
B. distance to a target
C. size of a target
D. shape of a target
[单项选择]Which general statement concerning radar is FALSE?（）.
A. Raising the antenna height increases the radar range
B. The ability of radar to detect objects is unaffected by weather conditions
C. Radar bearings are less accurate than radar ranges
D. Radar should be checked regularly during clear weather to ensure that it is operating properly
[单项选择]Which condition indicates that your radar needs maintenance?（）
A. Serrated range rings
B. Indirect echoes
C. Multiple echoes
D. Blind sector
[单项选择]Would you please（）on the radar?
A. Switch
B. To switch
C. Switched
D. Will switch
