更多"The loran lines drawn on navigation"的相关试题:
[单项选择]Lines drawn through points on the earth having the same atmospheric pressure are known as（）.
A. isothermal
B. millibars
C. isobars
D. seismics
[单项选择]Lines drawn through points on the Earth having the same atmospheric pressure are known as （）.
A. Isothermal
B. Millibars
C. Isobars
D. Seismics
[单项选择]The charts show two dashed lines crossing the river justsouth of St. Catherine Bar Light. What does this indicate? （）
A. Overhead power lines
B. Louisiana-Mississippi ferry crossings
C. Two railroad trestles
D. Two submerged oil pipelines
[单项选择]The Loran needs（）.
A. repairing
B. to repair
C. repairs
D. have repaired
[单项选择]All Loran-C transmitting stations are equipped with cesium frequency standards which permit （）.
A. every station in one chain to transmit at the same time
B. each station to transmit without reference to another station
C. on-line transmission of single-line transmitters at the same time
D. each station to only depend on the master for synchronization and signal ratio
[单项选择]The line connecting the Loran-C master station with a secondary station is called the（）.
A. Focus line
B. Base line
C. Side line
D. Center line
[单项选择]A line of position derived from a loran reading is a section of a(n) （）.
A. straight line
B. arc
C. parabola
D. hyperbola
[单项选择]At 2200 you take the following loran readings: 9960-W-15064.5; 9960-Y-43954.8. Which statement is TRUE? （）
A. The current is flooding
B. You are being set to the left of the track
C. The set is towards the southwest
D. The drift is 0.6 knot.
[单项选择]Most modern Loran-C receivers，when not tracking properly，have a（n）（）.
A. Bell alarm to warn the user
B. Lighted alarm signal to warn the user
C. Alternate signal keying system
D. View finder for each station
[单项选择]Loran-C is which type of system（）.
A. Reflected electron
B. Electrical radiation
C. Quarterpoint electrical navigation
D. Hyperbolic radio navigation
[单项选择]In using Loran-C，skywave reception gives greater range but is（）.
A. only accurate during daylight hours
B. much less accurate
C. only accurate at twilight
D. more accurate than using ground waves
[单项选择]The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found（）.
A. on loran charts covering areas where sky waves are used
B. in the Radio Aids to Navigation，PUB 117
C. in the Loran-C Correction Tables
D. Sky waves cannot be matched to ground waves in LORAN-C to produce a usable reading
[单项选择]Loran-C uses the multiple pulse system because（）.
A. Less signal energy is necessary for receiver operation
B. More signal energy is available at the receiver
C. It significantly increases the peak power
D. It increases the signal capacity
[单项选择]A “full service” Loran-C receiver will provide（）.
A. matching pulse rates of at least 20 stations
B. an automatic on-and-off switch
C. a horizontal matching of all delayed hyperbolic signals
D. automatic signal acquisition and cycle matching
[单项选择]Isogonic lines are lines on a chart indicating （）.
A. points of equal variation
B. points of zero variation
C. the magnetic latitude
D. magnetic dip
[单项选择]Maintenance of charts and nautical publications up to date is a statutory requirement under the（）Convention.
A. STCW
B. MARPOL
C. SOLAS
D. ISM
[单项选择]Navigational charts are subject to frequent changes，the important ones of which are promulgated by （）.
A. Admiralty Notices to Mariners
B. Mariner's Handbook
C. Catalogue
D. Sailing Directions
