航海英语(甲类船长)航海仪器单选题练习2
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You have calibrated your RDF．When compiling the calibration table，the correction to be applied to any future RDF bearings is listed against the ______．
- A.true bearing of the transmitter
- B.relative bearing of the transmitter
- C.heading of the vessel
- D.time of reception
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You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made ________．
- A.Flinders bar first，then the heeling magnet and spheres
- B.Heeling magnet first，then the Flinders bar and spheres
- C.Flinders bar first，then the spheres and heeling magnet
- D.Spheres first，then the Flinders bar and heeling magnet
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With respect to automatic identification systems（AIS），which information is expected to be broadcast every 1 to 10 seconds ________．
- A.Rate of turn
- B.Latitude and longitude
- C.Navigational status
- D.All of the above
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With respect to automatic identification systems（AIS），which information is required to be broadcast every 1 to 10 seconds ________．
- A.Call sign and IMO number
- B.Course over ground and MMSI
- C.MMSI number and call sign
- D.Route Plan and navigational status
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While you are at anchor，what will serve as a positive warning that you are drifting towards the wrecks located to the NW and SW of your 2215 position ________．
- A.A decreasing reading on loran pair 9960-X
- B.The bearing of Wolf Trap Light changing to the right
- C.Increasing soundings
- D.The bearing of Wolf Trap Light changing to the left
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Which statement concerning GPS is TRUE ________．
- A.It cannot be used in all parts of the world
- B.There are 12 functioning GPS satellites at present
- C.It may be suspended without warning
- D.Two position lines are used to give a 2D fix
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Which one of the followings does not limit the effective range of radar ________．
- A.Pulse width
- B.Pulse repetition frequency
- C.Peak power
- D.Target brightness
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Which of the following statements is TRUE regarding automatic identification systems（AIS）________．
- A.AIS cannot be used to make passing arrangements because the system is not capable of this type of ship-to-ship communications
- B.AIS cannot be used to make passing arrangements because the ship-to-ship text messaging feature is for emergency use only
- C.AIS can be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is not relieved from the requirement to sound whistle signals or make arrangements via bridge-to-bridge radiotelephone
- D.AIS can be used to make passing arrangements via ship-to-ship text massaging thus relieving a vessel operator from making such arrangements via bridge-to-bridge radiotelephone or signaling intent to pass via whistle signals
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Which of the following statements is TRUE regarding crane operations ________．
- A.Radio communications allow the crane operator to disregard the use of hand signals
- B.The crane operators and signalman must be familiar with the correct hand signals
- C.The forward cranes can be operated from the bridge
- D.The aft cranes can be operated from the aft steering station
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When should the emergency position-indicating radio beacon be activated after abandoning an OSV ________．
- A.Immediately
- B.After one hour
- C.Only when another vessel is in sight
- D.Only after sunset
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When your vessel is proceeding to the area of traffic density，______ is used to determine the exact ranges of other ships or objects in the vicinity．
- A.Radar
- B.GPS
- C.DF
- D.Satellite Navigator
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Which of the following statements is TRUE regarding automatic identification systems（AIS）________．
- A.AIS is a global tracking system that relies upon INMARSAT C service to communicate vessel position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
- B.AIS is a short-range 3 cm X-band radar system that automatically sends a vessel's position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
- C.AIS is a short-range VHF-FM system that automatically broadcasts a vessel's position and other safety related information frequently to similarly equipped vessels，aircraft and shore stations within the area
- D.AIS is a one-way centrally managed system that requires the local VTS to send commands to instruct each vessel to broadcast position and other safety related information to similarly equipped vessels，aircraft and shore stations within the area
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What does not contribute to the commercial GPS receiver position error ________．
- A.Satellite clock
- B.Ship's speed
- C.Atmospheric/ionospheric propagation
- D.Receiver
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When navigating using DGPS（Differential Global Positioning System）you may expect your position to be accurate to within a radius of ______．
- A.10 meters
- B.20 meters
- C.50 meters
- D.100 meters
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To obtain accuracy in fixing by DF，______ and three stations should be used．
- A.Parallel bearings
- B.Long-range bearings
- C.Short-range bearings
- D.Cross bearings
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Vessels in port may use ______ for receiving typhoon warnings during the typhoon season．
- A.Their transmitters
- B.Their receivers
- C.Their radars
- D.Their lorans
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The use of pulse groups and extremely precise timing at each Loran-C station makes possible the use of ______．
- A.High frequency pulses
- B.Combinations of high and low frequency pulses
- C.The same frequency for all stations in a chain
- D.Varied long and short pulses
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The receiver uses ______ satellites to compute latitude，longitude，altitude，and velocity．
- A.one
- B.two
- C.three
- D.four
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The time interval between the transmission of signals from a pair of Loran-C stations is very closely controlled and operates with ______．
- A.An atomic time standard
- B.Daylight Savings Time
- C.Eastern Standard Time
- D.Greenwich Mean Time
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The range of a SSB transmission is MOST affected by ______．
- A.Atmospheric noise and radiated power
- B.The frequency band selected and time of day or night
- C.Interference and position of the moon
- D.Radiated power and nearness to shore
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The operator of the ship's radiotelephone，if the radiotelephone is carried voluntarily，must hold at least a ______．
- A.Mate's license
- B.Restricted radiotelephone operator permit
- C.Second-class radio operator's license
- D.Seaman's document
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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
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The loran lines drawn on navigation charts represent ______．
- A.Ground waves
- B.Skywaves
- C.Either ground waves or skywaves interchangeably
- D.An average between ground wave and skywave positions
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The operation of which aids to navigation may be suspended during war or national emergency ________．
- A.Navigational satellites
- B.Loran
- C.Omega
- D.Any of the above
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The GPS system was designed for ______ satellites．
- A.3
- B.12
- C.18
- D.24
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The information received by AIS will be displayed on ______．
- A.DCU
- B.UTC
- C.ENC
- D.MENU
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The ______ transmits own ship data cyclically via two defined VHF channels and receives the same data of the other ships and objects that are equipped with AIS systems．
- A.AIS
- B.ECDIS
- C.GPS
- D.VDR
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The basic collision avoidance display presented by CASII is designed for easy interpretation and ______ of possible collision threat situations．
- A.Full confirmation
- B.Precise appreciation
- C.Immediate assessment
- D.Timely recognition
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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
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Most GPS receivers use the doppler shift of the carrier phase to compute ______．
- A.Latitude
- B.Longitude
- C.Speed
- D.Time
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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
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More exact assessment of visibility when ______ is used to determine the range of vessel or other objects in the vicinity．
- A.Radar
- B.Omega
- C.Satellite navigator
- D.DF
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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
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Loran-C is which type of system ________．
- A.Reflected electron
- B.Electrical radiation
- C.Quarterpoint electrical navigation
- D.Hyperbolic radio navigation
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Loran-C is which type of navigation system ________．
- A.Hyperbolic，long-range navigation system
- B.Short-range electronic
- C.Long-range，high frequency navigation system
- D.Long-range，with a frequency of 1950 kHz
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It may be found that，in certain circumstances，Radar Beacon can cause unwanted interference particularly ______．
- A.At close range
- B.At end on situation
- C.At head on situation
- D.At crossing situation
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It is dangerous for vessels without the use of radar ______ the estuary．
- A.To get
- B.To approach
- C.To proceed
- D.To close
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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
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Heeling error is defined as the change of deviation for a heel of ______．
- A.2° while the vessel is on an intercardinal heading
- B.1° while the vessel is on a compass heading of 000°
- C.2° and is constant on all headings
- D.1° while the vessel is on a compass heading of 180°
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How can rescue personnel detect that a SART is transmitting in the immediate vicinity ________．
- A.The SART's blips on the PPI will begin arcing and eventually become concentric circles
- B.The DSC unit will react to the SART's signal and respond with the two-tone autoalarm
- C.The SART can provide an approximate location to within a two nautical mile radius per IMO standards
- D.The SART signal appears as a target which comes and goes; the effect of heavy swells on a SART
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If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the ______．
- A.Skip zone
- B.Blackout zone
- C.Diffraction zone
- D.Shadow zone
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Due to GPS roll over of the clock cycle，GPS receivers may give the wrong time and position or may lock up permanently on ______．
- A.21-Aug-99
- B.21-Sep-99
- C.October 31，1999
- D.31-Dec-99
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Deviation which is maximum on intercardinal compass headings may be removed by the ______．
- A.Flinders bar
- B.Transverse magnets
- C.Fore-and-aft magnets
- D.Soft iron spheres on the sides of the compass
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Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism．These correctors are the ______．
- A.Fore-and-aft and athwartships magnets
- B.Dip needle and heeling magnet
- C.Heeling magnet and Flinders bar
- D.Flinders bar and quadrantal spheres
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Based on your 2209 fix，which would be a warning that you are being set down on Block Island Sound South Entrance Obstruction Lighted BIS Buoy ________．
- A.Decreasing loran readings on 9960-W
- B.Visual bearings of Montauk Point Lt．changing to the left
- C.Increasing bearings of Southeast Point Light
- D.Decreasing soundings
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Based on a DR，at approximately 1817 you would expect to______．
- A.enter a traffic separation zone
- B.cross a submerged pipeline
- C.depart a regulated area
- D.depart a restricted area
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Automatic identification systems（AIS）are required to ______．
- A.provide safety-related information automatically to shore stations，other vessels and aircraft
- B.receive safety-related information automatically from similarly equipped vessels
- C.exchange safety-related information with shore-based facilities
- D.All of the above
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At the master gyrocompass，the compass card is attached to the ______．
- A.Spider element
- B.Sensitive element
- C.Link arm
- D.Pickup transformer
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After abandoning a vessel，water that is consumed within the first 24 hours will ______．
- A.Pass through the body with little absorbed by the system
- B.Help to prevent fatigue
- C.Quench thirst for only 2 hours
- D.Help to prevent seasickness
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A system of reservoirs and connecting tubes in a gyro compass is called a ______．
- A.Spider element
- B.Mercury ballistic
- C.Gyrotron
- D.Rotor
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AMVER is a system which provides ______．
- A.satellite communications
- B.navigational information
- C.weather information
- D.position reporting service
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A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．
- A.The horizontal component of the permanent magnetism
- B.Deviation caused by the vessel's inclination from the vertical
- C.Induced magnetism in the horizontal soft iron
- D.Induced magnetism in the vertical soft iron
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A compass card without north-seeking capability that is used for relative bearings is a（n）______．
- A.Bearing circle
- B.Pelorus
- C.Bearing bar
- D.Alidade
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______ is on the panel of DF．
- A.ZERO CLEARING
- B.ANTI-CLUTTER-RAIN
- C.DIMMER
- D.CURSOR
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______is not a component of GPS．
- A.He space component
- B.Control component
- C.User component
- D.Alarming component
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______ is on the panel of DF．
- A.RINGS INT
- B.SWEEP INT
- C.REPEATER
- D.GONIOMETER
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______ is not a factor which will affect the accuracy of GPS receiver．
- A.detective Availability
- B.local environmental conditions
- C.autonomous mode versus differential correction mode versus RTCM mode
- D.the averaging of recorded locations
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______ is not an alarm required by IMO standards to be available on the ECDIS．
- A.Deviating from a planned route
- B.Approach to waypoints and other critical points
- C.Light house detecting
- D.Larger scale chart available
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______ is a digitized“picture”of a chart．
- A.Vector chart format
- B.Raster chart data
- C.pixel
- D.Electronic Nautical Chart