記憶度
15問
35問
0問
0問
0問
アカウント登録して、解答結果を保存しよう
問題一覧
1
154. Your ship is on course 150° at a speed of 17 knots, if the apparent wind is from 040 ° of the starboard bow at a speed of 15 knots. What would be the direction of true wind and speed?
•True wind from 270° and speed about 11 knots.
2
111. What is the term used to describe the earth's magnetic anomaly?
•Magnetic declination.
3
151. At what altitude would you categorize the location of the middle clouds?
•Between 6,500 ft - 20,000 ft
4
138. What is the shape of the Starboard hand lateral marks used in IALA Region B?
•Conical, pillar or spar.
5
112. What kind of weather accompanying the word fracto in a weather forecast use as a prefix to startus or cumulus clouds?
•Rainy weather with strong winds
6
173. If your vessel is on course 180° at a speed of 22 knots. The apparent wind is 70° off your port bow and speed 20 knots. What would be your true wind direction and speed?
•True wind from 231° and speed about 24 knots.
7
106. Which of the following is the surest sign of the proximity of a tropical storm?
•If the interuption on the barometer is 5 mb or more below normal.
8
165. How does the air move in a land breeze?
•From the land to the ocean.
9
180. Which Global Positioning System signal or code is available for use by civilians?
•The SPS signal.
10
131. In what area on the earth surface does the compass decreases its accuracy?
•75 degree latitude
11
176. Where would you find a comprehensive list of navigating charts with the title and number for various parts of the world?
•Chart Catalogue
12
134. What is the ability of a substance to retain magnetic properties after the magnetizing force has been removed?
•Magnetic remanence.
13
157. How would you ensure that the vessel's position is correct at all times during coastal navigation?
•The bearings by the magnetic compass must be corrected for variation and deviation.
14
150. When the navigational channel passes under a fixed bridge, what would be the lights that mark the edges of the channel on the bridge?
•Red lights.
15
198. You are underway on course 160°T at 10 knots. The current is 210°T at 0.9 knots. What is the speed made good?
•10.7 knots
16
139. Out of the 57 navigational stars tabulated in the Nautical Almanac, how many are of the first magnitude?
•19
17
119. How would you define alternating light?
•A rhytmic light showing light of alternating colors.
18
189. You are enroute from Puerto Rico to New York. A hurricane makes up and is approaching. If the wind veers steadily, what does this indicates?
•Your vessel is in the dangerous semicircle
19
159. Atmospheric pressure indicated by a barometer or a barograph may be subjected to several errors. Which of the following is NOT an error affecting barometer reading?
•speed error
20
104. On your ARPA, there are two guard zone. How would you classify the function of the inner guard zone?
•It give warning of small targets that are initially detected that are closer than the outer zone.
21
147. The dry bulb thermometer is 30°C and the wet bulb temperature is 28°C, what is the relative humidity?
•85%
22
185. At 2245H, your GPS fixes your position at Lat 21° 01.75' N and Long 172° 48.40' W. You are steering a course of 086° psc at a speed of 6.0 knots. At 2400H, you fix your position at Lat 21° 04.2' N and Long 172° 38.85' W. What were your set and drift?
•360°T x 0.4 knots
23
107. What conclusion can you draw if the moon and sun align with the Earth?
•The tides will be stronger because the attraction of the moon and sun is combine.
24
193. Which of the following apply to the angular height of the center of a body above the observer rational horizon?
•True altitude
25
141. What is precipitation?
•The part of the water cycle when clouds get heavy and can no longer hold the liquid water.
26
135. How often are Notice to Mariners published?
•Weekly
27
124. As you enter a U.S. Channel from seaward, how do the numbers on the buoys changes?
•It increase with the can buoys being odd numbered
28
169. Atmospheric pressure indicated by a barometer may be subjected to several errors. Which of the following is NOT an error affecting barometer reading?
•Speed error
29
194. Which one best describes Jet Stream?
•It is a long narrow meandering current of high speed winds near the tropopause blowing from generally westerly direction and often exceeding a speed of 250 miles per hour,
30
140. It is a chart projection depicting the poles and small areas on either side of a connecting meridian that is sometimes used for star chart.
•Transverse Mercator projection
31
197. What is the earth's orbital speed?
•16.1 nautical miles per second
32
186. How does the Relative Humidy of a place goes throughout the 24 hours of a day?
•It reduces during the day and increases at night.
33
137. What is the nature of the beam transmitted by echo sounder?
•It is a directional beam
34
144. What is the used of a drybulb thermometer?
•To measures the temperature of the atmosphere.
35
171. Which is your best indicator of change in weather that may be expected at the passage of a line squall?
•A sudden rise in barometric pressure.
36
163. What daymark shape is used in the lateral system?
•Triangle
37
123. How would you show your understanding of an echo sounder having a Pythagoras error?
•This error is found when two transducers are used one for transmission and the other for reception.
38
175. What is the function of radar that is used to determine the relative distance of any target on the screen to accurately determine position?
•Variable Range Marker
39
162. In navigation, how would you define a characteristic?
•It is the audible, visual, or electronic signal displayed by an aid to navigation to assist in the identification.
40
152. How would you show your understanding of humidity?
•It is the water vapour of the air expressed in mass per unit volume.
41
127. How would you obtain the ship position by taking ito account winds, tides, currents and estimated speed?
•Dead-reckoning position
42
181. What is the difference between the True north and the Magnetic north?
•Variation
43
172. What corrections must always be applied, when reading a mercurial barometer?
•Corrections for latitude and height above sea level
44
196. What will be the reading that is equivalent to one complete turn of the graduated scale micrometer drum of a sextant?
•1 degree
45
142. Polaris always appears due north in the sky to a precision better than how many degree?
•one degree
46
114. What would be the sextant reading when the index and the horizon mirrors are parallel?
•0 deg.
47
133. If you are in the Southern Hemisphere as a general rule (Buy's Ballot Law), how would you determine the center of low pressure?
•Faces the surface of the wind the center of low is toward your left.
48
155. What is the unit of measurement in finding the mean distance between the earth and the sun?
•1 astronomical unit
49
130. What is the relationship of the 'Pulse Length' in the overall performance of the Echo Sounder in order to obtain accuracy and a clear record of the seabed?
•It is responsible for the vertical resolution of the echo sounder, short pulses are necessary for a better resolution to reduce the probability of false echoes due to strong reverberation.
50
149. You are navigating in the open sea when you received the following navigational warnings. How would you classify navigational warnings in order of importance??
•Gale warnings; Any changes or development of new buoyage system. Vessels aground in approaching port areas; Gunnery or fire exercise areas and underwater activities in certain areas;
51
136. What is the variation of a compass if the True heading is 215° and the Magnetic heading is 223°?
•8° W
52
103. When you navigate using magnetic compass, what is the force that causes compass deviation?
•Magnetic field
53
158. You are on board a right handed single screw vessel proceeding along the right bank of a narrow channel, what should you do if the vessel starts to sheer due to bank sunction/cushion effect?
•increase speed and put the rudder right full
54
174. Which of the following is INCORRECT about differential GPS?
•It reduces geometric dilution of position.
55
117. How could you determine that mixed (time and clear) icing is most likely to be encountered?
•In nimbostratus cloud at a temperature of -10°C.
56
109. How does a Global Positioning System receiver get a signal from the satellite?
•Satellite signals are sent at different frequencies and coded.
57
191. How would you estimate the bearing of the storm center's in the northern hemisphere?
•By Buys Ballot's Law if you face the wind the center of the storm is approximately in your right.
58
108. What is the speed of the wind in a beaufort force 8?
•Wind speed 34 to 40 knots mean 37 knots
59
126. You are on course 355° T and take a relative bearing of the peak of a mountain of 275°. What is the true bearing of the peak of the mountain?
•270° T
60
128. If you take a bearing of 043° and 169° to two prominent objects, what bearing of the third object will provide the best fix?
•Thje best bearing of the third object should be about 102°
61
166. Determine the relative humidity if the air temperature is 90°F and the wet bulb temperature is 81°F?
•67%
62
132. At 1600H, you fix your position and change course to 315°T. At 1625H, you again fix your position, and it is 0.9 mile southwest of your DR position. Find the drift:
•2.1 knots
63
101. What is the light rhythm (when fitted) of the North Cardinal marks used in IALA Region A and region B?
•Very Quick or Quick flashing
64
145. What will you expect of the relative humidity of a place throughout the 24 hours of the day?
•Reduce during the day and increase at night.
65
184. What method can you find the most applicable in connection with the keeping up-to-date Sailing Directions?
•To know incidently if the book will be the subject of revision within a short time.
66
156. What is your understanding of compass adjustment?
•It is the process of neutralizing undesired magnetic effects on a magnetic compass.
67
118. How could you determine the existence of the condition that poor visibility is developing?
•When warm air passes over a surface; which is cooler than dew point of the of the air; advection fog can form. This occurs over land and sea.
68
190. What is the light color (when fitted) of the Port hand lateral marks used in IALA Region A?
•Red
69
121. A vessel is following a range to keep herself within a narrow channel. The chart indicates the range to be 243 deg. What is the coarse the vessel is steering so that she can identify that the vessel is "on range".
•True course 243deg.
70
122. What judgement can you make in the weather forecast with a dropping barometer and a low cloud ceiling?
•An increase of humidity and temperature
71
182. You are underway, and intend to make a good course of 040°T. You experience a current with a set and drift of 190°T at 1.4 knots and a northwest wind produces a leeway of 3°. You adjust your course to compensate for the current and leeway, while maintaining an engine speed of 10.0 knots. What will be your speed made good over your intended course of 040°T?
•8.8 knots
72
129. How would you show understanding of relative humidity?
•It is the ratio of the existing absolute humidity to its saturation value at the same temperature.
73
105. What do you think will happens to the speed of sound, when the water salinity increases?
•It will increase.
74
199. How many knots must a ship maintained in order for the speed adjustment of the master gyrocpmpass more effective?
•3 knots
75
116. Which of the following a Differential Global Positioning System does not reduce?
•Multi-path errors.
76
183. Determine the approximate geographic visibility of an object, with a height above the water of 26.0 meters, for an observer with a height of eye of 18.25 meters?
•20 nautical miles
77
125. How can you describe Absolute Humidity?
•The amount of water vapor that a given quantity of air holds.
78
170. What is your understanding of an aid to navigation?
•Any device external to a vessel specifically intended to assist navigators in determining their position.
79
143. What would be the best reference among the available onboard publications that you are going to use in order to reckon the height of tides of a given place?
•The same tide tables as that used for the charts of the locality.
80
200. Determine the relative humidity if the air temperature is 70°F and the wet bulb temperature is 60°F?
•57%
81
160. How would you classify a 3D fix that consider altitude require in theoritical position lines when using GPS?
•It requires 4 theoritical position lines.
82
167. Determine the best cross bearing line of position between two known objects ashore when piloting a vessel in order to obtain an accurate fix.
•The best is about 90° apart
83
187. You are on course 357° T and take a relative bearing of a lighthouse of 180°. What is the true bearing of the lighthouse?
•177° T
84
192. Speaking of Global Positioning System, How does the DGPS provides a horizontal accuracy?
•With in a range of 10 meters
85
113. Which of the following statements best described how does a snow is formed?
•Snow is formed by the aggregation or joining together of ice crystal.
86
115. What would be the nature of the bottom if you see fine dots on some of the coastal areas of a chart?
•Sandy beach
87
178. How would you classify the circular line limiting the observer view at sea?
•It is the visible horizon.
88
102. What is the shape of the East cardinal marks used in IALA Region A and Region B?
•Pillar or spar.
89
148. How would you categorize the courses and the bearings which are laid down on the chart?
•All the courses and all the bearings which are laid down down on the chart are true.
90
179. What conclusion can you draw as the safest procedure to follow while navigating in the vicinity of tropical cyclone?
•Take avoiding action as early as possible.
91
195. What position do you obtain when you take two or more intersecting position lines at nearly the same time?
•Fix
92
188. In what way can a RADAR help you to avoid the storm center?
•Certain radar sets can display on the screen areas moderate or heavy rain continuously for at least fifty nautical miles in broad sector.
93
168. When using the depth finder in the open ocean, what phenomena is most likely provide a continuous trace that isn't from the actual bottom?
•It generate echoes from depth scattring layer..
94
164. What is meant by Speed Made Good?
•This is the net speed based on distance and time of passage directly from one point of another.
95
153. Which of the following condition could determine that the existence of poor visibility is developing?
•When warm moist air passes over a surface, which is cooler than the dew point of the air the visibility will deteriorate as advection fog is form.
96
120. Which of the following statements regarding local weather is NOT a considerable importance in the approaches to a harbour and when coasting in tropical waters?
•The consideration of fast and quick route while navigating in coastal water and in tropical water.
97
177. At 1200H, you fix your position and change course to 315°T.At 1225H, you again fix your position, and it is 0.9 mile southwest of your DR position. Find the drift:
•2.1 knots
98
110. In Great Britain, the Nautical Almanac has been published annually and each page contains data that are tabulated for how many days?
•3 days
99
161. What is the relationship of the GAIN switch in the overall performance of the Echo Sounder in order to obtain accuracy and a clear record of the seabed?
•It entails signal amplification of the noise and consequently the data record may be confused.
100
146. Which of the following statements should NOT be included in the reasons why you need a knowledge of Meteorology?
•The knowledge of Meteorology will ensure a fast and quick turn around trade route while navigating at sea.