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C3 - Use of Radar and ARPA for the safety of navigation (200-258)

  • Joedz Padin

    • 問題数 57 • 8/1/2023

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  • 1

    201. Regarding performance standards for navigational radar, what are the requirements for a scanner?

    •Plus or minus 1 degree

  • 2

    202. When using the ARPA in heavy rain, which action should you take?

    •Navigate as though the effective range of the radar has been reduced

  • 3

    203. You are approaching a sea buoy which emits a racon signal.This signal is triggered by which type of radar?

    •3 cm

  • 4

    204. Which ARPA data should you use in order to determine if a close quarter situation with another vessel is developing or not?

    •Relative track of information

  • 5

    205. What is best to use when an ARPA is being used for inshore navigation?

    •Ground stabilization

  • 6

    206. What is the performance standard set by the International Maritime Organization for the radar bearing discrimination?

    •The radar system should be capable of displaying two point targets at the same range, separated by 2.5 degrees in bearing, as two distinct objects

  • 7

    207. What should be the typical radar range discrimination?

    •Not less than 50 metres.

  • 8

    208. What is the operational check you should carry out when a radar set is installed?

    •Check the accuracy of the heading marker

  • 9

    209. What is the technique used in radar pilotage for continuously monitoring a vessel position?

    •Parallel indexing

  • 10

    210. Which of these controls is provided to check the overall efficiency of the radar?

    •Performance monitor

  • 11

    211. What is the main concern when using the radar for coastal position fixing?

    •To obtain the most accurate fix.

  • 12

    212. After changing range scales on which the ARPA facilities are available, or resetting the display, in what period of time should full plotting information be displayed?

    •A period of time not exceeding four scans

  • 13

    213. .Indicate three important target data which can be received from radar tracking of other ships?

    •Course, speed and risk of collision.

  • 14

    214. An X-Band radar operates in which frequency band?

    •8 - 12 GHz

  • 15

    215. Waht would be the effect of attenuation in radar performance?

    •Reduced detection ranges.

  • 16

    216. You are using a radar in which your own ship is shown at the center and the heading flash always poitns to 000 degrees. Bearing are measured in relation to the flash, what type of bearings are produced?

    •Relative

  • 17

    217. When using ARPA fitted radars in heavy rain, the following actions should be taken EXCEPT:

    •Use the 3 cm radar instead of the 10 cm radar

  • 18

    218. If your vessel, while proceeding North at 15 knots, observed by radar a stationary target, what would be the approximate direction and rate at which the pip would move on you PPI scope?

    •South at 15 knots

  • 19

    219. What is TRUE when operating in fog and other vessels are detected by radar?

    •You should maneuver in ample time if a close quarter situation is developing

  • 20

    220. Two ships approach each other on reciprocal courses, one with a speed of 22 knots, the other with 15 knots. What is their relative speed?

    •37 knots

  • 21

    221. What is the purpose of function of the "Trial Mode" used in most ARPA equipment?

    •It is used to allow results of proposed maneuvers to be assessed

  • 22

    222. If the gyro fails, in which display would the ARPA default into?

    •Head-up

  • 23

    223. After 3 minutes of tracking, ARPA should provide CPA to what accuracy?

    •Within 0.3 miles

  • 24

    224. What is the minimum acquired radar target capacity in the performance requirements for all ships/crafts of 500 gross tonnage and upwards but less than10,000 gross tonnage?

    •30

  • 25

    225. What is the performance standard set by International Maritime Organization for the radar range accuracy?

    •The accuracy of ranges should be within 1% of the range scale in use or 30 m, whichever is the greater distance

  • 26

    226. What does the description "Racon"beside an illustration on a chart would mean?

    •Radar Conspicuous beacon

  • 27

    227. Which of the following is an IMO Performance Standards of ARPA requirement for ships over 10,000 gt?

    •Manually acquire at least 40 targets

  • 28

    228. What is the performance standard set by the International Maritime Organization for the radar range discrimination?

    •The radar system should be capable of displaying two targets on the same bearing, separated by 40 m in range, as two distinct objects

  • 29

    229. What radar control is used for the purpose of enabling the detection of close targets which otherwise might be obscured by sea clutter?

    •Sensitivity Time Control

  • 30

    230. Your radar is set on a true motion display. Which of the following will appear to move across the PPI scope?

    •Own ships marker

  • 31

    231. The detection range of surface targets is decreased when radar waves touch the Earth's surface at point closer than the standard horizon. What type of refraction is this?

    •Sub refraction

  • 32

    232. In radar principle, what measures may be taken to minimize dangers from blind spot?

    •Frequent change of PRF from low to high and vice versa and observing results on the screen

  • 33

    233. In calm and clutter free conditions, what is the minimum detection range for X-band radar if the target is a 5-meter tall SOLAS ship (less than 5,000 gross tonnage)?

    •8 nm

  • 34

    234. Which of the following Performance Standards requirement of IMO for ARPA for ships over 10,000 grt?

    •Manually acquire at least 40 targets

  • 35

    235. When operating the ARPA, what is used to warn the observer if any distinguishable target closes to a chosen range or transits a zone chosen by the observer?

    •Guard rings and zones

  • 36

    236. What is the purpose of radar tracking of other ship?

    •To receive information about ships in the vicinity

  • 37

    237. Using relative motion display mode, what enables you to be assessed after a plot of successive positions of a target at timed intervals?

    •Closest point of approach (CPA)

  • 38

    238. If the radar antenna operates at 60 RPM, how many seconds shall elapse for a typical ARPA to generate a target vector?

    •15 seconds

  • 39

    239. Which of the following is NOT an information can an ARPA give you after one minute of steady state of tracking?

    •Time of execution

  • 40

    240. In a Radar system constant, what is the typical pulse repetition frequency?

    •500 to 3000 pulses per second

  • 41

    241. How are side echoes appear on the radar screen?

    •A symmetrical arc of echoes.

  • 42

    242. How are sea clutter echoes appear on a radar screen?

    •A mass of small echoes around the screen center.

  • 43

    243. Which radar control is used to shorten all echoes on the display and reduces the clutter caused by the snow or rain?

    •Fast time constant

  • 44

    244. What do you call the radar transponder which emits a characteristic signal when triggered by a ship radar?

    •Racon

  • 45

    245. With regards to ARPA, what does the "lost target" warning tell?

    •Target can no loger be plotted

  • 46

    246. Regarding performance standards for navigational radar, what are the requirements for a scanner?

    •It should rotate at a constant RPM of not less than 12 in relative wind speed up to 100 knots

  • 47

    247. In calm and clutter free conditions, what is the minimum detection range for X-band radar if the target is a 4-meter tall small vessel with radar reflector meeting IMO Performance Standards?

    •5 nm

  • 48

    248. In accordance with Performance Standards adopted in December 2004 an ARPA must have how many alarm signals?

    •Three

  • 49

    249. What is the most reliable bridge aid to navigation instrument during coastal passage?

    •Radar

  • 50

    250. On a relative motion radar display, when will be a radar contact remain stationary?

    •Only when it is on the same course and speed as your vessel

  • 51

    251. Which of the following an ARPA must make available past track history?

    •Tracked targets by ARPA

  • 52

    252. What is the radar front panel control that reduces weak echoes out to a limited distance from the ship?

    •Sensitivity time control (sea-clutter control)

  • 53

    253. Under Rule 5 of the COLREgs, when should the radar be used for keeping a proper look-out?

    •Whenever it may help

  • 54

    254. What is the main component of the radar transmitter?

    •Magnetron

  • 55

    255. When two tracked targets are very close to each other, what do you call the process where the radar data of one target shifts over to the other target?

    •Target swap

  • 56

    256. What is the best land target to be used for radar ranging?

    •A cliff face

  • 57

    257. It is a marine radar performance control that provides a variable fast time constant for a better definition.

    •Rain Clutter Control