更多"Which of the following radar contac"的相关试题:
[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 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]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 coast
B. The bottom in the area is sand and gravel
C. The fix is indeterminate
D. You are governed by the Inland Rules
[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]Which of the following is not a factor which can interfere with the pulse of sound and cause a variation the depth reading?（）
A. salinity
B. temperature
C. the hydrostatic pressure
D. Vessel’s speed
[单项选择]Areas which cannot be scanned by the radar of the vessel because they are shielded by parts of its superstructure, masts,etc means（）.
A. blind sectors
B. sheltered area
C. unseen area
D. unscan ble area
[单项选择]AREAS WHICH CANNOT BE SCANNED BY THE RADAR OF THE VESSEL BECAUSE THEY ARE SHIELDED BY PARTS OF ITS SUPERSTRUCTURE，MASTS，ETC means（）.
A. Blind sectors
B. Sheltered area
C. Unseen area
D. Unscanable area
[单项选择]As to the bearing, of the following, which statement is not true?（）
A. ff overheat is found, the engine must be stopped for inspection
B. Much heat of the crankcase door indicates that the bearing is overheated
C. If bearing clearance is too large, knocking will be heard in the crankcase
D. If bearing clearance is too large or too small, the white metal may be melted
[单项选择]As to the piston cooling, of the following, which statement is not true?（）
A. Because the piston is exposed to very high temperature, it must be cooled
B. The lower the piston cooling temperature is, the better it is
C. Both water and lube oil can be used as coolant
D. One of the piston cooling methods is vibration cooling, with better effect
[单项选择]A radar display which is oriented，so that north is always at the top of the screen，is called a(n)（）.
A. relative display
B. composite display
C. stabilized display
D. unstabilized display
[单项选择]A radar display in which North is always at the top of the screen is a(n)（）.
A. unstabilized display
B. stabilized display
C. composition display
D. relative display
[单项选择]You are using a radar in which your own ship is shown at the center，and the heading flash always points to 0°. If bearings are measured in relation to the flash，what type of bearings are produced?（）.
A. Relative
B. TRUE
C. Compass
D. Magnetic
[单项选择]Which condition suggests that your present position lies in the navigable semicircle of a tropical storm（）.
A. A backing wind
B. A veering wind
C. Sustained gale force winds
D. A strong wind that maintains a constant speed and direction
[单项选择]Your radar is set on a true motion display.Which of the following will NOT appear to move across the PPI scope（）.
A. Echoes from a buoy
B. Own ship's marker
C. Echo from a ship on the same course at the same speed
D. Echo from a ship on a reciprocal course at the same speed
[多项选择]Which of the following characteristics describe the BPDU Guard feature（）
A. ABPDU Guard port should only be configured on ports with PortFast enabled.
B. BPDU Guard and PortFast should not be enabled on the same port.
C. BPDU Guard is used to ensure that superior BPDUs are not received on a switch port.
D. ABPDU Guard port receiving a BPDU will go into err-disablestate.
E. ABPDU Guard port receiving a BPDU will be disabled.
F. BPDU Guard can be enabled on any switch port.
[单项选择]Which of the following commands would successfully implement an access list on a routers virtual terminal line?（）
A. RouterTK(config-line)# access-class 10 in
B. RouterTK(config-if)# ip access-class 23 out
C. RouterTK(config-line)# access-list 150 in
D. RouterTK(config-if)# ip access-list 128 out
E. RouterTK(config-line)# access-group 15 out
F. RouterTK(config-if)# ip access-group 110 in
[单项选择]Which of the following statements about transmitting distress messages by radiotelephone is INCORRECT?（）
A. If no answer is received on the designated distress frequencies，repeat the distress call on any frequency available
B. Channel 16 (156.8) may be used for distress messages
C. It is advisable to follow a distress message on 2182 kHz by two dashes of 10 to 15 seconds duration
D. Distress messages should first be transmitted on 2182 kHz
