Assessment Test


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1. What does the agonic line on an isomagnetic chart indicates?

 
 

2. What does the vessel change if the compass deviation changes?

 
 

3. What happens to the compass card in a magnetic compass when a vessel changes course to starboard?

 
 

4. What is an error in a gyrocompass caused by rapid changes in course, speed and latitude causing deviation before the gyro can adjust itself?

 
 

5. What lines are indicated on a chart by an Isogonic lines?

 
 

6. What should be done when a magnetic compass is not in use for a prolonged period of time?

 
 

7. What then if the compass heading and the magnetic heading are the same?

 
 

8. Which statement about the Flinders bar on a magnetic compass is correct?

 
 

9. Which would influence a magnetic compass?

 
 

10. C3 - To ensure that a RACON signal is visible in the 3cm. radar, one should ensure that the:

 

11. C3 - As per Solas V regulations safety of navigation a ships of 10,000 gross tons and above shall be fitted, with radar capable of operating in the:

 

12. C3 - The common frequencies used in merchant radar are approximately:

 

13. C3 - What does an automatic identification system (AIS) transponder use to transmit and receive information broadcasts?

 

14. C3 - If the Radar scanners of one vessel are in the same horizontal plane as the cargo deck of the other during transfer operations, which type of radar emissions would pose a greater danger of the induced ignition of flammable vapors?

 

15. C3 - Which is the most accurate position by radar fixes?

 

16. C3 - Echoes in radar from two or more targets close to each other at the same range may emerge to form a single echo. The ability of a radar to separate this is called:

 

17. C3 - The ability of a radar to separate targets close together on the same bearing is called:

 

18. C3 - This type of radar enhance to maximum visibility in marginal weather condition.

 

19. C3 - The characteristics on which bearing resolution depends is:

 

20. C3 - Which indicates that your radar needs maintenance?

 

21. C3 - Which radar control is used to shorten all echoes on the display and reduces the clutter caused by the snow or rain?

 

22. C3 - When navigating in coastal waters which of the following is not considered as a factor?

 

23. C3 - Raster-scan chart data is:

 

24. C3 - This may occur when a strong echo is received from another ship at close range.

 

25. C3 - This is the decrease in the strength of a radar wave resulting from absorption, scattering and reflection by the medium as it passes the atmosphere.

 

26. C3 - The unit which sends returning target echoes to the receiver is the:

 

27. C3 - What do you call the marker in the radar PPI which the operator can put in any direction to watch the incoming target?

 

28. C3 - The difference in intensity of the illumination of the radar scope between radar images and the background of the screen.

 

29. C3 - In confined waters which of the following equipment becomes more reliable in obtaining vessel's position?

 

30. C3 - An identification of ships, coastal areas and other targets, good range and range resolution are important because they:

 

31. C3 - Most commonly, ship's radar operates in the:

 

32. C3 - Which of the following is the best to obtain vessel's position during poor visibility?

 

33. C3 - Which bridge equipment is used in determining the distance to and direction of objects by sending out a beam of microwave radio energy and detecting the return reflections?

 

34. C3 - While underway, a vessel over 100,000 gross tons with an automatic identification systems (AIS) is expected to broadcast all of the following information every 1 to 10 seconds EXCEPT:

 

35. C3 - On a relative motion radar, the closest point of approach (CPA) of a contact is determined:

 

36. C3 - When may the automatic identification system (AIS) be switched off?

 

37. C3 - This radar unit performs a dual function both in transmission and reception.

 

38. C3 - Navigation at coastal waters, radar is generally used to supplement

 

39. C3 -The intensity of the election beam in the C.R.T. is controlled by:

 

40. C3 - The minimum range at which a target can be detected is basically determined by which of the following?

 

41. C3 - The transmission time duration of a single pulse of radio-frequency energy is a function of the:

 

42. C3 - In marine navigation, radar signal is:

 

43. C3 - PPI display of a radar means:

 

44. C3 -The description "Racon" beside an illustration on a chart would mean a:

 

45. C3 - Which of the following is NOT recommendable to obtain vessel's position as radar target?

 

46. C3 - Which of the following is correct concerning RAMARK?

 

47. C3 - This is defined as the radar control that reduces weak echoes to a limited distance from the ship:

 

48. C3 - The scattering and absorption of the energy in the radar beam as it passes through the atmosphere is called:

 

49. C3 - Which is the name of movable, radial guide line used to measure direction in the radar?

 

50. C3 - Countries are producing unique digital charts based on their interpretation of IHO standards:

 

51. C3 - Which device emits a characteristic signal when triggered by a ship's radar?

 

52. C3 - This safety device when activated in a distress situation responds to radar interrogation by transmitting a swept frequency signal which generates 12 blips code on a radar screen.

 

53. C3 - Which term refers to the combination of a Radar transmitter and receiver?

 

54. C3 - Spoking would be indicated on the radar receiver by:

 

55. C3 - In ARPA, which of the following is TRUE?

 

56. C3 - Which statement is TRUE concerning a vessel equipped with operational radar?

 

57. C3 - The relative motion line, when extended past the represented position of the observer's ship, shows:

 

58. C3 - This is a shadow area when ship structures at equal height with the scanner, causing areas behind scanner to be un-scanned.

 

59. C3 - Incoming target echoes are detected by the:

 

60. C3 - A choppy sea produces this unwanted echo.

 

61. C3 - The following are unwanted echoes, except:

 

62. C3 - What is the purpose of the anti-clutter

 

63. C3 - X-band radar is the name for __________ radar and S-band is the name for __________ radar.

 

64. C3 - What does RADAR stand for?

 

65. C3 - The components that generate the radio-frequency energy in the form of short powerful pulse is the:

 

66. C3 - What is the IMO requirement for ARPA detection?

 

67. C3 - An increase in temperature with an increase in altitude would tend to cause:

 

68. C3 - In a Polar region with very cold wind blowing over warmer sea, you would expect__________ .

 

69. C3 - A large ship close by may cause _________ .

 

70. C3 - Which of the following radar displays is not stabilized?

 

71. C3 - Does the COLREGS give any preference to ships equipped with ARPA?

 

72. C3 - With regards to ARPA, what does the "lost target" warning tell?

 

73. C3 - It is the term used at the instant an electro-magnetic wave is passing by an obstruction between two places?

 

74. C3 - What is equivalent to one complete oscillation?

 

75. C3 - An indirect radar echo is caused by a reflection of the main lobe of the radar beam of the observer's vessel. Which of the following is NOT a characteristic of indirect echoes?

 

76. C3 - When using the ARPA in heavy rain, which action should you take?

 

77. C3 - This is a radar transponder which emits a characteristics signal when triggered by ship's radar

 

78. C3 - How can rescue personnel detect that a SART is transmitting in the immediate vicinity?

 

79. C3 - When using an ARPA, what should you consider in order to evaluate the information displayed?

 

80. C3 - The radar control that reduces weak echoes out to a limited distance from the ship is the __________._

 

81. C3 - Which ARPA data should you use in order to determine if a close quarters situation will develop with a target vessel?

 

82. C3 - Your ARPA has automatic speed inputs from the log. Due to currents, the log is indicating a faster speed than the speed over the grounds. What should you expect under these circumstances?

 

83. C3 - What is the purpose of the anti-clutter "sea" control on the radar?

 

84. As a vessel changes course to starboard, the compass card in a magnetic compass __________.

 
 

85. You are proceeding up a channel at night. It is marked by a range which bears 185T. You steady up on a compass course of 180 with the range in line dead ahead. What does this indicates?

 
 

86. Your ship is steaming at night with the gyropilot engaged when you notice that the vessels course is slowly changing to the right. What action should you take FIRST?

 
 

87. Besides variation, what does the compass rose on a nautical chart also indicates?

 
 

88. If a magnetic compass is not affected by any magnetic field other than the Earths, which statement is TRUE?

 
 

89. What would happen if the compass heading and the magnetic heading are the same?

 
 

90. If the gyrocompass error is east, what describes the error and the correction to be made to gyrocompass headings to obtain true headings?

 
 

91. Isogonic lines are lines on a chart and what does it indicates?

 
 

92. What do you call those Lines on a chart which connect points of equal magnetic variation?

 
 

93. What aspect where Magnetic variation changes?

 
 

94. On an isomagnetic chart, what is the line of zero variation?

 
 

95. What indicates in the agonic line on an isomagnetic chart?

 
 

96. What is the compass error of a magnetic compass that has no deviation?

 
 

97. What is called as the gyrocompass error resulting from your vessels movement in OTHER than an eastwest direction?

 
 

98. What is the most accurate method of determining gyrocompass error while underway?

 
 

99. The spin axis of a gyroscope tends to remain fixed in space in the direction in which it is started. How does this gyroscope become north seeking so that it can be used as a compass?

 
 

100. What caused Variation in a compass?

 
 


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