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When choosing objectsfor position fixing byradar ranges youshould, if possible,avoid....(1) sloping land features(2) large prominentfeatures(3) steep faced features(4) small isolated

1

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Related FlashcardsFlashcards DO7-Radar Navigation - Operational level

Do7-Radar Navigation - Operational Levelby [email protected] , Aug 2012 Subjects: operational sets6000

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eatures

The vertical beam mustbe wide enough to allowfor the......(1) rolling and pitching

of the ship.(2) elimination of shadow sectors.(3) the size of largetargets.(4) reduction of seaclutter.

1

Compared to the visualhorizon, the radar

horizon is....(1) about 6% further away(2) about 3% further away(3) about 3% nearer (4) about 6% nearer

1

Radar range accuracyshould be within......(1) 1.5 % of the rangescale in use.(2) 0.5 % of the rangescale in use.(3) 3.5 % of the rangescale in use.(4) 2.5 % of the rangescale in use.

1

Range discriminationdepends mainly onwhich of the following?(1) Pulse length(2) Pulse repetitionfrequency(3) Transmittedfrequency(4) Scanner rotationspeed

1

Multiple echoes can berecognised becausethey appear....(1) at constant range


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intervals(2) around the arc of acircle(3) along a curved line(4) on a false bearing

1

The most commoncause of radar interference is....(1) other radar transmissions on asimilar frequency(2) electromagneticstorms or disturbances(3) defective electricalequipment on the shipexperiencinginterference(4) the power of radar transmissions from your own ship

1

Sea clutter is caused byreflections from ....(1) the sides of waves.(2) small craft andbuoys.(3) the blank surface of the sea.(4) areas of precipitation.

1

Radar targets give thestrongest echoes if theyare.....(1) hard and dense.(2) soft and porous.(3) made of wood.(4) poor electricalconductors.

1

A radar target is likely togive the poorestreflection if it's shapeis......(1) conical.(2) can-shape.(3) a perpendicular plane.(4) cylindrical.

1


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A target with a "rough"surface is likely to......(1) give a good echo atany aspect.(2) reflect all the energyin one direction.(3) give only a very

weak echo.(4) appear very smoothto a 3 cm radar.

1

Side echoes are causedby reflections from....(1) the side lobes of theradar beam.(2) the obstruction in thepath of the scanner.

(3) the surface of thesea.(4) the side of your ownvessel.

1

Side echoes appear onthe radar display as.....(1) a symmetrical arc of echoes.(2) echoes in shadow

sectors.(3) lines radiating fromthe centre.(4) a line of echoes onone bearing.

1

What is the closestpoint of approach of target A ?(1) Between 2 - 2.2

miles(2) Less than 0.9 miles(3) Between 3 - 3.9miles(4) Between 1 - 2 miles

2

What is the time of closest point of approach of target A ?(1) Between 31-45minutes(2) Between 21-30minutes3 Between 46-60

2


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minutes(4) Between 11-20minutes

What is the closestpoint of approach of target A ?(1) Between 1-2 miles(2) Less than 0.9 miles(3) Between 4-5 miles(4) Between 2.1-3.9miles

2

What is the time of closest point of approach of target A ?

(1) Between 0-10minutes(2) Between 11-20minutes(3) Between 21-30minutes(4) Between 31-40minutes

2

What is the closest

point of approach of target A ?(1) Between 1-2 miles(2) Between 2-4 miles(3) Less than 0.9 miles(4) More than 4 miles

2

What is the closestpoint of approach of target B ?

(1) Between 1-2 miles(2) Less than 1 mile(3) Between 4-5 miles(4) More than 5 miles

2

Which target will havethe closest point of approach?(1) Target B(2) Target C

(3) All equal(4) Target A

2


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What is the closestpoint of approach of target B ?(1) Between 1 - 1.9miles(2) Less than 0.9 mile(3) Between 2 - 2.9miles(4) Between 3 - 3.9miles

2

Which target will havethe closest point of approach ?(1) Target A(2) Target B(3) Target C(4) All equal

2

Which target will havethe closest point of approach ?(1) Target A(2) Target B(3) Target C(4) All equal

2

Which target will havethe closest point of approach ?(1) Target A(2) Target B(3) Target C(4) Target D

2

What is the closestpoint of approach of target B ?(1) Between 4-5 miles(2) Less than 0.9 mile(3) Between 1 - 1.9miles(4) Between 2 - 3 miles

2

What is the closestpoint of approach of target B ?(1) Between 1 - 2 miles

2


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(2) Less than 1 mile(3) Between 3 - 4 miles(4) More than 4 miles

Which target will havethe closest point of

approach ?(1) Target A(2) Target B(3) Target C(4) Target D

2

What is the closestpoint of approach of target A ?(1) More than 5 miles

(2) Less than 0.9 mile(3) Between 4 - 5 miles(4) Between 1 - 2 miles

2

What is the time of closest point of approach of target B ?(1) Between 0 - 10minutes(2) Between 21 - 30

minutes(3) Between 31 - 45minutes(4) Between 46 - 60minutes

2

What is the aspect of the target C ?(1) Stern or nearlyastern(2) Port bow. (Red 15-75)(3) Starboard bow.(Green 15-75)(4) End on or nearly endon

2

What is the closestpoint of approach of target A ?(1) Between 2-2.9 miles(2) Less than 0.9 miles(3) Between 3-3.9 miles(4) Between 1-2 miles

2


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What is the aspect of the target B ?(1) Stern or nearlyastern(2) Port bow. (15-75)

(3) Starboard bow. (15-75)(4) End on or nearly endon

2

What is the time of closest point of approach of target B ?(1) Between 11-20minutes

(2) Between 21-30minutes(3) Between 31-45minutes(4) Now or passed

2

Second trace echoesare more likely to occur when ....(1) a low P.R.F. is used..

(2) a high P.R.F. is used.(3) a short pulse lengthis used.(4) a long pulse lengthis used.

2

Which of the followinghas the most effect onthe definition of a smalltarget on the radar

display?(1) Scanner rotationspeed(2) Horizontalbeamwidth(3) Pulse repetition rate(4) Accuracy of rangemarkers

2

Accurate target

bearings are obtainedby......(1) making the radar


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.(2) synchronizing theradar beam and thetrace.(3) making the radar beam wide horizontally.(4) rotating the traceintermittently.

2

One cause of bearingerror is....(1) inaccuracy of thefixed range ring(2) misalignment of thecentre of the trace onthe display(3) scanner mountedtoo far forward(4) use of an unsuitable

Pulse RepetitionFrequency ( PRF )

2

To provide accuratetarget bearings theradar beam must be......(1) wide in thehorizontal plane.(2) narrow in thehorizontal plane.

(3) narrow in the verticalplane.(4) wide in the verticalplane.

2

The horizontal distancebetween the adjacentcrests of a radio wave iscalled....(1) the amplitude

(2) the wavelength(3) a cycle(4) the frequency

2

S-band radar has awavelength of ....(1) 3.1 to 3.2 cm(2) 9.2 to 10 cm(3) 5.0 to 5.4 cm(4) 12.5 to 12.9 cm

2


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As distance from thescanner increases, thepower of the radar beam....(1) remains constant(2) decreases rapidly(3) decreases slowly(4) increases slowly

2

Incoming target echoesare detected by the....(1) video amplifier (2) mixer crystal(3) I.F. amplifier (4) local oscillator

2

A typical radar pulselength is......(1) 5.05 to 10.25microseconds.(2) 0.05 to 1.25microseconds.(3) 10.25 to 15.05microseconds.(4) 1.23 to 5.03microseconds.

2

In addition to initiatingthe action of thetransmitter, the trigger unit also sends a pulseto the:(1) scanner to startscanner rotation.(2) display to start thetimebase.(3) waveguide to open

the T.R. cell.(4) receiver to start thelocal oscillator.

2

Using relative motiondisplay mode, a plot of successive positions of a target at timedintervals enables you toassess....(1) it's true course(2) it's closest point of approach (CPA)3 it's as ect

2


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(4) it's true speed

In restricted visibility,risk of collision can bestbe assessed by....(1) posting additionallookouts(2) watching the target'sradar bearing and range(3) establishing radiocommunication with thetarget(4) listening for thetarget's sound signals

2

The purpose of the T/R

cell is to....(1) paint the headingmarker on the display(2) protect the receiver during transmission(3) radiate the radar pulses to the targets(4) shape the beam inthe horizontal plane

2

The electrons in theCathode Ray Tube (CRT) are attracted....(1) from the grid to thecathode(2) from the cathode tothe anodes(3) from the grid to theanodes(4) from the anodes tothe cathode

2

The intensity of theelectron beam in theC.R.T. is controlled by....(1) passing a currentthrough the deflectioncoil(2) varying the potentialon the grid(3) a signal from thetime unit(4) the action of the firstanode

2


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On a radar display, thissymbol identifies the....(1) tuning control(2) gain control(3) focus control(4) brilliance control

2

Before taking targetbearings, you shouldcheck that....(1) the Variable RangeMarker ( VRM ) isswitched on(2) the trace is correctlycentred(3) the gain control is

set to zero(4) the heading marker is switched off

2

This display symbolshown is for....(1) true motion(2) head-uppresentation(3) relative motion

(4) north-uppresentation

2

The display symbolshown here is for....(1) radar standby(2) the power monitor (3) heading marker alignment(4) scanner rotating

2

Altering the range scalemay automaticallychange the....(1) anti-clutter settings(2) pulse length(3) amplification of echoes(4) transmittedfrequency

2


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the anti-rain clutter control is the....(1) shift control(2) F.T.C. control(3) S.T.C. control(4) swept gain control

2

Attenuation is ....(1) the radiation of radar energy from a power source.(2) the absorption of radar energy by theatmosphere.(3) the reflection of radar energy fromprecipitation.(4) the scattering of

radar energy around atarget.

2

Super-refraction isnormally caused by....(1) cool air over a warmsea surface(2) warm air over a coolsea surface(3) strong winds

(4) disturbances in theupper atmosphere

2

Clutter echoes are notusually caused by ....(1) rain.(2) fog.(3) hail.(4) snow.

2

Positions obtain byradar....(1) should only be usedin restricted visibility(2) should be checkedby other availablemeans(3) cannot be relied onfor navigation(4) should be usedindependently of other aids

2


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An operation checkrequired on installationis to....(1) determine the lengthof waveguide(2) determine the limitsof shadow sectors(3) measure thefrequency of the localoscillator (4) measure the peakpower output

2

Ducting of the radar beam is caused by....(1) extreme sub-

refraction conditions(2) extreme super-refraction conditions(3) mild sub-refractionconditions(4) mild super-refractionconditions

2

Edges of land should beavoided if possible

when position fixing byradar because of....(1) the effect of pulselength(2) their poor definition(3) the difficulty of theidentification(4) the effect of verticalbeamwidth

2

The most common typeof radar reflector usedby small craft is ....(1) the Luneberg lens.(2) the octahedralcluster.(3) the racon.(4) the pentagonalcluster.

2

An aid to identifyingland features at longrange is....


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pulse lengths(2) a chart withtopographic details(3) the echo-rangingprinciple(4) a reflection plotter

2

The distance of theradar horizon is largelydetermined by......(1) the state of the seasurface.(2) the downwardrefraction of radar waves.(3) the width of thescanner.(4) the amount of cloud

cover.

2

Minimum radar rangedepends mainly on......(1) scanner height.(2) pulse length.(3) receiver sensitivity.(4) vertical beamwidth.

2

Radar range accuracydepends mainly onthe......(1) alignment of centreof trace.(2) accuracy of thetimebase.(3) accuracy of fixedrange rings.(4) receiver sensitivity.

2

Radar bearingdiscrimination is theability to displayseparately....(1) two targets atslightly different rangeand bearings(2) two targets at samerange on slightlydifferent bearings(3) two targets on samebearing at same range4 two tar ets on same

2


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bearing at slightlydifferent ranges

If your radar suffersfrom shadow sectorsyou should....(1) warn approachingvessels in fog(2) determine andrecord their limits(3) consult your operator's manual(4) report the fact toyour marine authority

2

Indirect echoes appear

on the display....(1) on the true bearing,but at a false range(2) on the true range,but on a false bearing(3) on the true rangeand bearing(4) on a false range andbearing

2

The cause of shadow or blind sectors is....(1) electromagneticinterference(2) obstructions on your own ship(3) rough weather conditions(4) side lobes of theradar beam

2

What is the aspect of the target A ?(1) Starboard bow(Green 15-75)(2) Starboard quarter (Green 105-160)(3) Port bow (Red 15-75)(4) Port quarter (Red105-160)

3

What is the closest


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target A ?(1) Between 2.1-2.9miles(2) Between 3-3.9 miles(3) Between 1 - 2 miles(4) Less than 0.9 mile

3

What is the closestpoint of approach of target A ?(1) Between 1-2 miles(2) Between 4 - 5 miles(3) Less than 1 mile(4) Between 2-4 miles

3

What is the closestpoint of approach of target A ?(1) Between 3-4 miles(2) Less than 1 mile(3) Between 2-2.9 miles(4) Between 1-2 miles

3

What is the closestpoint of approach of target A ?(1) Between 4-5 miles(2) Less than 1 mile(3) Between 2- 4 miles(4) Between 1-2 miles

3

Which target will havethe closest point of approach?(1) Target A(2) Target C(3) Target B(4) All Equal

3

What is the closestpoint of approach of target B ?(1) Between 1-2 miles(2) Between 4-5 miles(3) Less than 1 mile(4) Between 2-4 miles

3


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Which target will havethe closest point of approach?(1) Target C(2) All equal(3) Target B(4) Target A

3

What is the closestpoint of approach of target C ?(1) Between 2-3 miles(2) Between 1-2 miles(3) Less than 1 mile(4) Between 4-5 miles

3

What is the closestpoint of approach of target B ?(1) Between 3 - 4 miles(2) Between 4 - 5 miles(3) Less than 0.9 mile(4) Between 1 - 2 miles

3

Which target will havethe closest point of

approach ?(1) Target A(2) Target B(3) Target C(4) All Equal

3

What is the closestpoint of approach of target C ?(1) Between 3 - 4 miles

(2) Between 4 - 5 miles(3) Less than 0.9 mile(4) Between 1 - 2 miles

3

What is the time toclosest point of approach of target C ?(1) Between 46-60minutes(2) Between 31-45minutes(3) Between 21-30minutes4 Now or assed

3


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Which target will havethe closest point of approach ?(1) Target A(2) Target B(3) Target C(4) All the same

3

Which target will havethe closest point of approach ?(1) Target A(2) Target D(3) Target B(4) Target F

3

Which target will havethe closest point of approach ?(1) Target D(2) Target C(3) Target B(4) Target E

3

What is the time of closest point of approach of target A ?(1) Between 11-20minutes(2) Now or passed(3) Between 31-45minutes(4) Between 46-60minutes

3

What is the time of closest point of approach of target B ?(1) Between 0-10minutes(2) Between 11-20minutes(3) Between 21-30minutes(4) Now or passed

3


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a s e me oclosest point of approach of target A ?(1) Now or passed(2) Between 10 - 20minutes(3) Between 31-45minutes(4) Between 46-60minutes

3

What is the aspect of the target B ?(1) Starboard bow.(Green 15-75)(2) Starboard beam(Green 75-105)(3) Port bow. (Red 15-75)(4) Port beam. (Red 75-105)

3

What is the closestpoint of approach of target A ?(1) Less than 0.9 miles(2) Between 2 - 2.9miles(3) Between 3 - 4 miles(4) Between 1 - 2 miles

3

If the visibility isrestricted, what actionshould be taken in thissituation ?(1) A broad alteration toport(2) A broad alteration of course to starboard

(3) A substantialreduction of peed(4) Stand on withcaution

3

What is the time of closest point of approach of target C ?(1) Now or passed(2) Between 31 - 45

minutes(3) Between 21 - 30minutes

3


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t

-minutes

Which target will havethe closest point of approach ?(1) Target A(2) Target B(3) Target C(4) Target D

3

What is the time of closest point of approach of target A ?(1) Between 11 - 20minutes(2) Between 46 - 60minutes(3) Between 31 - 45minutes(4) Now or passed

3

What is the time of closest point of approach of target A ?(1) Between 11-20minutes(2) Between 46-60minutes(3) Between 21-30minutes(4) Now or passed

3

What is the closestpoint of approach of target A ?(1) Between 1-2 miles(2) Between 4-5 miles(3) Less than 0.9 miles(4) Between 3-3.9 miles

3

What is the closestpoint of approach of target A ?(1) Less than 0.9 miles(2) Between 4-5 miles(3) Between 2 - 3 miles(4) Between 3-3.9 miles

3
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Target ranges areobtained from......(1) the pulse repetitionfrequency.(2) the heading marker.(3) the range marker.(4) the bearing marker.

3

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