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Seagull Training > Radar > Flashcards

Radar Flashcards

0
Q

Does the Collision Regulations give any preference to ships equipped with radar?

A

No.

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1
Q

Can the frequency of radar pulses transmitted per second affect the radar’s maximum range?

A

Yes.

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2
Q

Does the ships trim affect radar minimum range?

A

Yes, it may introduce obstructions and blind sectors. Only at short distance.

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3
Q

How can the Beam Width Distortion be minimized?

A

Reduce the setting of the Gain control.

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4
Q

How can the horizontal extent of a “Blind Sector” be accurately determined?

A

By turning the ship through 360 degrees and determining when a strong echo disappears and reappears on the radar screen..

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5
Q

How does radar antenna height influence on sea clutter?

A

High antenna height results in more sea clutter displayed on the screen.

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6
Q

How is the amplifier protected from the transmitted pulse?

A

By the Transmitter/Receiver switch.

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7
Q

IMO resolution 477 applies to all ships built after?

A

1984

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8
Q

Is it a requirement to have the HM-suppress button spring loaded?

A

Yes, it is a IMO requirement.

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9
Q

Marine radar bearing accuracy is generally?

A

Good, but not as good as the range rings.

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10
Q

Marine radar range accuracy is generally?

A

Good, but the range rings are better than the VRM.

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11
Q

The action taken to avoid collision in reduced visibility should be:

A

Positive, in ample time and avoiding a series of small alterations.

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12
Q

The actions required by the Collision Regulations can be ignored when:

A

Never.

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13
Q

The radar must be able to operate in relative wind speeds up to?

A

100 knots

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14
Q

The reflection of radar pulses is similar to that of?

A

Light waves.

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15
Q

We have normal transmission of radar waves when the radar horizon is?

A

10% longer than the visible horizon.

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16
Q

What is known as “Side Lobes” with reference to marine radar?

A

Unwanted lobes of energy transmitted outside the main radar transmission beam.

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17
Q

What is sometimes known as a Coded Racon?

A

A racon which displays a Morse code on the radar screen..

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18
Q

What is the correct setting for the “Gain” control?

A

A little noise (speckled effect) remaining visible on the screen.

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19
Q

What is the correct type of radar display to be selected when at sea?

A

Always use a compass stabilized display either True Motion or Relative Motion to suit experience and environment.

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20
Q

What is the effect of error in own ships speed, when completing a plot?

A

Error in the targets course and speed.

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21
Q

What is the effect of gyro error?

A

All bearings will be wrong.

22
Q

What is the effect of Sub-refraction?

A

Distance to the radar horizon is reduced.

23
Q

What is the fundamental principle of a marine radar?

A

Detection of other objects outside own ship.

24
Q

What is the main content of Rule 19 in the Collision Regulations?

A

The conduct of vessels in restricted visibility.

25
Q

What is the main disadvantage of true plotting?

A

Collision risk (CPA) can only be found by completing the plot.

26
Q

What is the main function of the antenna?

A

To transmit the radar signals and receive echoes from objects.

27
Q

What is the main function of the receiver?

A

Amplify the incoming signals.

28
Q

What is the main purpose of plotting?

A

Obtain information about whether danger of collision exists, CPA, TCPA, target course and speed.

29
Q

What is the main purpose of the parallel index lines?

A

To assist the navigator in maintaining the desired course over the ground..

30
Q

What is the maximum radar “warm-up” time?

A

4 min

31
Q

What is the meaning of “radar Bearing Discrimination”?

A

The radar ability to display as separate spots on the screen, close targets on the same range.

32
Q

What is the meaning of “radar’s Range Discrimination”?

A

The radar ability to display as separate spots on the screen, close targets on the same bearing.

33
Q

What is the minimum display diameter required on ships bigger than 1600 tons but less than 10 000 tons?

A

250 mm

34
Q

What is the minimum number of range scales required?

A

5

35
Q

What is the minimum radar display diameter for ships of 10 000 tons and upwards?

A

16 inch

36
Q

What is the purpose of a radar reflector?

A

Making small objects more radar visible.

37
Q

What is the purpose of determining the Aspect of a target vessel ?

A

Provide the same information as could be seen visually out of the wheelhouse window.

38
Q

What is the purpose of the Anti Sea Clutter controls?

A

Reduces the affects of the echo returns from the sea waves.

39
Q

What is the purpose of the Gain control?

A

To adjust the amount of amplification of the echoes.

40
Q

What is the purpose of the Heading Line (HL) -suppression control

A

To switch off the HL temporarily in order to see under the line on the screen.

41
Q

What is the purpose of the VRM control?

A

To measure distance of a target on the screen accurately from own ship..

42
Q

What is the quickest method of deciding whether collision danger exists or not?

A

By taking several bearings of the target..

43
Q

What is the relation between the scanner’s horizontal width (size) and horizontal beam width?

A

Large scanner horizontal width, narrow horizontal beam width.

44
Q

What is the required accuracy of the heading marker?

A

+/- 1.0°

45
Q

What radar range should be selected to suit all conditions?

A

The range most suitable to the proximity of targets and land, but with frequent checks of higher and lower ranges.

46
Q

When completing a full Relative plot (North up), what input information is required?

A

A series of target ranges and bearings and own ship’s course and speed through the water.

47
Q

When does a radar display the identity signal of a racon?

A

When the wavelength of the racon is similar to the radar in use.

48
Q

Which course should be fed in to the radar with a stabilised radar picture?

A

True course steered by own ship.

49
Q

Which of the following provides the complete answer, when related to the effect of using incorrect bearings in plotting?

A

CPA, TCPA, Course and Speed of the target are effected.

50
Q

Which of the radar controls can be left at the setting determined when the set was first switched on?

A

None.

51
Q

Which radar condition can be associated with a temperature inversion?

A

Ducting.

52
Q

Why should radar still be used during the day in clear visibility?

A

To improve confidence and competence in the use of that specific radar.

Seagull Training (10 decks)

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