NAV5: Review
NAV5 Radar Systems Quiz
Test your knowledge on radar systems with our comprehensive NAV5 quiz! Designed for maritime professionals and enthusiasts, this quiz covers essential concepts and terminology related to RADAR operations.
Join now to explore:
- Radar pulse lengths
- ARPA fun
ctionality - Target detection performance
- Radar system capabilities
Selecting a short pulse length will _____ range discrimination, making it possible to distinguish between a tug and its tow for instance.
DECREASE
INCREASE
REMOVE
MAINTAIN
The tuning control of the radar system will amplify the power output.
True
False
The target detection performance of the equipment should be impaired when own ship is rolling or pitching up to +/- 10.
True
False
This _____ shows trails of target echoes in the form of simulated afterglow.
MODE
INT REJECT
ECHO TRAILS
HM OFF
The minimum acquired radar target capacity for ships more than 10,000 GRT is _____
20
30
40
50
By increasing the peak power of RADAR, the minimum radar range can be improved.
True
False
ARPA converts raw radar echo to an analog signal which can then be stored and used for calculation.
True
False
An ARPA system in the hands of unqualified personnel is NOT only dangerous but can indirectly be the main reason for an accident.
True
False
RADAR system DO NOT have the capability of calculating the velocity of an object in motion
True
False
RADAR systems provide data regarding the type of the target being resolved.
True
False
A 10-cm RADAR has a good performance on low altitude targets like buoy.
True
False
The duplexer ensure that all circuits connected to the radar system operate in a definite time relationship with each other.
True
False
The Fast Time Control reduces weak echoes out to a limited distance from a ship.
True
False
The _____ converts the transmitted/ received frequency of the radio wave back to a lower immediate frequency to allow proper amplifications of the returned echoes.
TUNING
GAINING
BRILLIANCE
ANTI-RAIN AND SEA CLUTTER
A magnetron is generally installed in the scanner unit.
True
False
A long pulse means better resolution in range.
True
False
The _____ reduces mutual radar interference.
ANTI-RAIN AND SEA CLUTTER
INTERFERENCE REJECTION
GUARD ALARM
MODE
_____ adjusts the brightness of range rings.
BRILLIANCE
EBL OFFSET
RANGE RINGS
INDEX LINES
Wavelength indicates the number of crests, which pass a fixed point per unit time.
True
False
The RADAR system provide data regarding the type of the target being resolved.
True
False
A 10-cm RADAR is called S-Band with a frequency of 9000 MHz.
True
False
The side lobe is the lobe containing the higher power.
True
False
The equipment should switch automatically to the unstabilized head-up mode within two minutes after the azimuth stabilization has become ineffective.
True
False
An optical horizon is the point of the earth surface which is tangential to the propagated radar wave.
True
False
This _____ provides an accurate measurement of range to targets.
ELECTRONIC BEARING LINE
INDEX LINES
BEARING MARKER
VARIABLE RANGE MARKER
ARPA converts digital signal to a raw radar echo which can then be display.
True
False
The data collected by RADAR system is enough to tell whether the object was in motion, or it was stationary
True
False
A properly adjusted brilliance control is when you’ve seen on the display the trace is as bright as possible.
True
False
A RADAR system should be capable of displaying two-point targets on the same bearing separated by 20 meters in range, as two distant objects as per performance standards of RADAR.
True
False
X-band radar has a wavelength of 10 cm.
True
False
Most ARPA system are less sensitive in auto-acquisition mode than in manual acquisition mode.
True
False
_____ may be provided to shade the display from sunlight but not to the extent that it will impair the observer’s ability to maintain a proper look-out.
Screening
Tuning
Adjusting
Cluttering
Selecting a short pulse length will _____ range discrimination, making it possible to distinguish between a tug and its tow for instance.
INCREASE
DECREASE
REMOVE
MAINTAIN
RADAR system is prone to external interference by other medium.
True
False
The STC is a form of swept gain control which turns _____ the gain in the area of the screen where sea clutter echoes are found.
UP
DOWN
BRIGHT
OFF
The radio signals emitted by RADAR system do NOT work beyond the ionosphere.
True
False
A RACON emits a characteristics signal when triggered by the ship’s RADAR.
True
False
The RADAR should provide the means to enhance the visibility of targets in advance clutter conditions at close range
True
False
The X-band RADAR is less affected by rain and fog.
True
False
The ARPA should be able to display on request with a relevant symbol at least three equally time-spaced past positions of any targets being tracked
True
False
The duplexer protected the receiver from the high pulses of the transmitter.
True
False
_____ controls the overall amplification of all returned echoes.
RAIN
GAIN
RANGES
TUNING
An ARPA should present within _____ of steady state tracking the motion of a target with the following accuracy values (95% probability values).
Two minutes
Three minutes
Six minutes
Seven minutes
The heading information should be displayed with a _____ resolution to permit accurate alignment with the ship gyro system.
Powerful
Tuned
Radar
Numerical
The bearing accuracy is generally better than the range accuracy of a radar.
True
False
The S-Band RADAR is less affected by target swop.
True
False
The X-Band RADAR should detect a SOLAS ships more than 5,000 Gross Tons by 12 nautical miles minimum.
True
False
A radar sweep is one complete 360-degree rotation of the antenna.
True
False
The FTC will _____ the interference on the screen due to the rain and increase the chance of seeing targets within rain showers.
MAINTAIN
INCREASE
REDUCE
REMOVE
The past position of targets being tracked is used to check the validity of the ARPA’s tracking.
True
False
It should be possible to cancel the display of unwanted ARPA data within _____ seconds.
3
4
6
7
The STC is a form of swept gain control which turns _____ the gain in the area of the screen where sea clutter echoes are found.
UP
DOWN
ON
OFF
RADAR signals cannot be used beyond the stratosphere.
True
False
The VRM provides an accurate measurement of bearings to target.
True
False
Specify the different methods in manual radar plotting and explain each method.
Hanapin
Mo
Nga
Pachat
Sa
Gc
Tnx
- penetrante
The HM is used to temporarily _____ the heading marker.
REMOVE
ERASE
DELETE
ADD
_____ is the combination of true course and true speed.
True motion
Relative motion
True motion fixed
Relative motion fixed
Relative motion
True
False
Misinterpretation of display symbols may NOT cause severe problems.
True
False
_____ is the speed of a target relative to own ship’s position.
Relative Speed
Relative motion
True speed
True motion
When using short pulse, you will get weaker pulse, less radar range but better resolution in range.
True
False
The function of the waveguide is to generate RF pulses.
True
False
The receiver amplifies the incoming echoes.
True
False
The radar equipment should be designed to provide the _____ and most consistent detection performance, restricted only by the physical limits of propagation.
Minimum
Maximum
Optimum
Best
Magnetron converts the input into high frequency oscillation.
True
The radio signals work best when the objects is further away from the receiver and NOT closer
True
False
The antenna transfers the transmitter energy to signals in space with the required distribution and efficiency.
True
False
The data provided by RADAR system is usually complete.
True
False
A bistatic RADAR is a radar system that compares the received signal from a single radar pulse against itself with an aim of comparing the signal.
True
False
The cursor position should have a continuous read-out to provide the range and bearing, measured from the consistent reference point.
True
False
A minimum of four independent _____, with a means to truncate and switch off individual lines, should be provided.
Index lines
EBL offset
Parallel index
INT Reject
_____ is a mode of display where own ship and all targets are referenced to the sea, using gyro heading and single axis log water speed input.
Radar Stabilization
Sea Stabilization
Ground Stabilization
Speed log
There is NO delays in the display of processed ARPA information, particularly on acquisition and re-acquisition or when target maneuvers.
True
False
The S-Band RADAR should detect a typical Navigation buoy by 4.6 nautical miles minimum.
True
False
A short pulse means less resolution in range.
True
False
A 3 GHz RADAR can determine and display the range and bearing of radar transponder.
True
False
Attenuation causes a decrease in echo strength.
True
False
The EBL measures the distance from your ship to the target object.
True
False
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