Тест по Radar Observation and Plotting (CES v5.0)
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Правильные ответы:
1
Can the frequency of radar pulses transmitted per second affect the radar’s maximum range?
Ваш ответ правильный:
Yes.
2
Does the Collision Regulations give any preference to ships equipped with radar?
Правильный ответ:
No.
Ваш ответ:
Yes.
3
Does the ships trim affect radar minimum range?
Ваш ответ правильный:
Yes, it may introduce obstructions and blind sectors.; Only at short distance.
4
How can the Beam Width Distortion be minimized?
Ваш ответ правильный:
Reduce the setting of the Gain control.
5
How can the horizontal extent of a “Blind Sector” be accurately determined?
Ваш ответ правильный:
By turning the ship through 360° and determining when a strong echo disappears and reappears on the radar screen.
6
How does radar antenna height influence on sea clutter?
Ваш ответ правильный:
High antenna height results in more sea clutter displayed on the screen.
7
How is the amplifier protected from the transmitted pulse?
Ваш ответ правильный:
By the Transmitter/Receiver switch.
8
IMO resolution 477 applies to all ships built after:
Ваш ответ правильный:
1984.
9
Is it a requirement to have the HM-suppress button spring loaded?
Ваш ответ правильный:
Yes, it is a IMO requirement.
10
Marine radar bearing accuracy is generally:
Ваш ответ правильный:
Good, but not as good as the range rings.
11
Marine radar range accuracy is generally:
Ваш ответ правильный:
Good, but the range rings are better than the VRM.
12
The action taken to avoid collision in reduced visibility should be:
Ваш ответ правильный:
Positive, in ample time and avoiding a series of small alterations.
13
The actions required by the Collision Regulations can be ignored when:
Ваш ответ правильный:
Never.
14
The radar must be able to operate in relative wind speeds up to:
Ваш ответ правильный:
100 knots.
15
The reflection of radar pulses is similar to that of?
Ваш ответ правильный:
Light waves.
16
We have normal transmission of radar waves when the radar horizon is:
Ваш ответ правильный:
10 % longer than the visible horizon.
17
What is known as “Side Lobes” with reference to marine radar?
Ваш ответ правильный:
Unwanted lobes of energy transmitted outside the main radar transmission beam.
18
What is sometimes known as a Coded Racon?
Ваш ответ правильный:
A racon, which displays a Morse code on the radar screen.
19
What is the correct setting for the “Gain” control?
Ваш ответ правильный:
A little noise (speckled effect) remains visible on the screen.
20
What is the correct type of radar display to be selected when at sea?
Ваш ответ правильный:
Always use a compass stabilized display either True Motion or Relative Motion to suit experience and environment.
21
What is the effect of Sub-refraction?
Ваш ответ правильный:
Distance to the radar horizon is reduced.
22
What is the effect of error in own ships speed, when completing a plot?
Ваш ответ правильный:
Error in the targets course and speed.
23
What is the effect of gyro error?
Ваш ответ правильный:
All bearings will be ignored.
24
What is the fundamental principle of a marine radar?
Ваш ответ правильный:
Detection of other objects outside own ship.
25
What is the main content of Rule 19 in the Collision Regulations?
Ваш ответ правильный:
The conduct of vessels in restricted visibility.
26
What is the main disadvantage of true plotting?
Ваш ответ правильный:
Collision risk (CPA) can only be found by completing the plot.
27
What is the main function of the antenna?
Ваш ответ правильный:
To transmit the radar signals and receive echoes from objects.
28
What is the main function of the receiver?
Ваш ответ правильный:
Amplify the incoming signals.
29
What is the main purpose of plotting?
Ваш ответ правильный:
Obtain information about whether danger of collision exists, CPA, TCPA, target course and speed.
30
What is the main purpose of the parallel index lines?
Ваш ответ правильный:
To assist the navigator in maintaining the desired course over the ground.
31
What is the maximum radar “warm-up” time?
Ваш ответ правильный:
4 min.
32
What is the meaning of “Radar Bearing Discrimination”?
Ваш ответ правильный:
The radar ability to display as separate spots on the screen, close targets on the same range.
33
What is the meaning of “Radar’s Range Discrimination”?
Ваш ответ правильный:
The radar ability to display as separate spots on the screen, close targets on the same bearing.
34
What is the minimum display diameter required on ships bigger than 1 600 tons but less than 10 000 tons?
Ваш ответ правильный:
250 mm.
35
What is the minimum number of range scales required?
Ваш ответ правильный:
5.
36
What is the minimum radar display diameter for ships of 10 000 tons and upwards?
Правильный ответ:
16 inch.
Ваш ответ:
12 inch.
37
What is the purpose of a radar reflector?
Ваш ответ правильный:
Making small objects more radar visible.
38
What is the purpose of determining the Aspect of a target vessel?
Ваш ответ правильный:
Provide the same information as could be seen visually out of the wheelhouse.
39
What is the purpose of the Anti-Sea Clutter controls?
Ваш ответ правильный:
Reduces the affects of the echo returns from the sea waves.
40
What is the purpose of the Gain control?
Ваш ответ правильный:
To adjust the amount of amplification of the echoes.
41
What is the purpose of the Heading Line (HL) suppression control?
Ваш ответ правильный:
To switch off the HL temporarily in order to see under the line on the screen.
42
What us the purpose of the VRM control?
Ваш ответ правильный:
To measure distance of a target on the screen accurately from own ship.
43
What is the quickest method of deciding whether collision danger exists or not?
Ваш ответ правильный:
By taking several bearings of the target.
44
What is the relation between the scanner’s horizontal width (size) and horizontal beam width?
Ваш ответ правильный:
Large scanner horizontal width, narrow horizontal beam width.
45
What is the required accuracy of the heading marker?
Ваш ответ правильный:
+/- 1,0°.
46
What radar range should be selected to suit all conditions?
Ваш ответ правильный:
The range most suitable to the proximity of targets and land, but with frequent checks of higher and lower ranges.
47
When completing a full Relative plot (North up), what input information is required?
Ваш ответ правильный:
A series of target ranges and bearings and own ships course and speed through the water.
48
When does a radar display the identity signal of a racon?
Ваш ответ правильный:
When the wavelength of the racon is similar to the radar in use.
49
Which course should be fed in to the radar with a stabilised radar picture?
Правильный ответ:
True course steered by own ship.
Ваш ответ:
True course made good over the ground.
50
Which of the following provides the complete answer, when related to the effect of using incorrect bearings in plotting?
Ваш ответ правильный:
CPA, TCPA, Course and Speed of the target are effected.
51
Which of the radar controls can be left at the setting determined when the set was first switched on?
Ваш ответ правильный:
None.
52
Which radar condition can be associated with a temperature inversion?
Ваш ответ правильный:
Ducting.
53
Why should radar still be used during the day in clear visibility?
Ваш ответ правильный:
To improve confidence and competence in the use of that specific radar.
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