Joshua Eric Abe
問題数 564 • 2/11/2025
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1
What can you determine in the readings of dry and wet thermometer on a psychometer?
relative humidity and dew point
2
What is meant by acronym EBL?
electronic bearing line
3
What day shape is used in the lateral system?
triangle
4
Describe what is cold wall?
it is the sudden line of demarcation separating the gulf stream from the labrador current
5
How can you describe absolute humidity?
the amount of water vapor that a given quantity of air holds
6
What is the surest sign of proximity of a tropical storm?
if the interruption on the barometer is 5 mb or more below normal
7
What frequency does automatic identification system (AIS) transponder transmit and receive messages?
VHF maritime band
8
A phace correction is applied to observation of
planets
9
What current flows southward along the west coast of the United States and causes extensive fog in that
California current
10
Which chart is a planar perspective projection, viewed from the point on the globe opposite the point of tangency?
stereographic chart
11
At night a channel is market by a range light which bears 185 T. You steady up on a compass course of 180 T with the range in line dead ahead. What does this indicates?
your compass has some easterly error
12
Which of the following is one of the two celestial poles that is above the observer's horizon?
elevated pole
13
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
14
A ship is steaming occurs of 090 degrees (T) at a speed of 14 knots. At 1814H, you observed a lighthouse bearing 053 degrees (T), ang 1940H, the same lighthouse bears 031 degrees (T) . What will be the time when the lighthouse is a beam of your vessel?
1926H
15
A vessel is following a leading light to keep her within the middle of a narrow channel. The chart indicates the range to be 001 degree. If she is "on range"what course she is steering?
true course 001 deg.
16
How would you show your understanding of humidity?
it is the water vapour of the air expressed in mass per unit volume
17
What is the ability of a substance to retain magnetic properties after the magnetizing forces been removed?
magnetic remanence
18
If your vessel is dragging her anchor in a strong wind, you should______
increase the scope of anchor cable
19
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 the bank sunction/cushion effect?
increase speed and put the rudder right full
20
What should you do first after the anchors has been let go when you are on a night watch in clear visibility?
take bearings to obtain ships position
21
A vertically-striped buoy may be
lighted with a white light
22
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
23
If you experience where there is no steering from remote control, what will be the MOST probable cause?
breakdown of hydraulic pumps
24
You are required to enter a lock on your voyage. Information on the lock regulations, signals, in radio communications can be found in
coast pilot
25
What would an excessive noise from the steering gear be developed?
excessive noise and vibration from the steering gear is due to air bubbles in the oil pumps and pipings are subjected to air hammer leading to vibration
26
Which of the following statements best describe the term tide?
regular vertical movement of the sea level in ocean
27
What is meant by the speed of advance?
this is the intended speed with respect to the earth, taking into consideration the effect of known predicted current.
28
What is the light color (when fitted) of the EAST cardinal marks used in IALA Region A and Region B?
white
29
What is the surface wind generally considered among the most constant of winds, blowing for days or even week with little change in direction?
trade winds
30
What is the top mark (if any) of the Port hand lateral marks used in IALA Region B?
single green cylinder (can)
31
Which of the following statements best describe how does a snow is formed?
snow is formed by the aggregation or joining together of ice crystal
32
What are the names of places taken on charts or from sailing directions called?
topographical names
33
What will be the movement of a deep draft vessel navigating in a narrow channel or canal like Panama Canal?
she will drag more water than when underway in deep water
34
There are two separate carrier frequencies that carry the signal transmitted by the GPS satellite. What is the second carrier frequency?
1227.60 MHz
35
Which routeing measure is described as areas within defined limits that constitute a boundary caused by natural obstacles, including those forming separation zone?
traffic lane
36
A tropical storm is building strength some distance from your MODU. Waves are coming from the east, with periods increasing from 5 seconds to 15 seconds. The swell is from the east. Where was the storm when this new is wells were generated?
to the east of you
37
You are on course 344 deg True and take a relative bearing of a lighthouse of 090 degrees. What is the true bearing of the lighthouse?
074 degrees
38
What is the light color ( when fitted) of the port hand lateral marks used in IALA region B?
Green
39
Determine the best cross bearing line of position between two known objects a shore when piloting a vessel in order to obtain an accurate fix?
the best is about 90° apart
40
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
41
How would you classify navigational warnings in order of importance?
casualties to large navigational buoys, primary lights or light ships; dangerous wrecks or obstruction to navigation; changes in depth of water; floating dangers-like containers, drifting buoys, icebergs
42
Which of these situations may cause false echoes in an echo sounder
turbulence from the interaction of tidal streams with solid particles in suspension
43
On what does the operation of aneroid barometer depend?
thin, metal, air tight cell
44
What is the variation of a compass if the true heading is 312° and the magnetic heading is 298°?
14°E
45
What meteorological instrument is used to measure air pressure?
barometer
46
What is the line drawn on a chart through places having the same value of magnetic declination?
isogonal
47
What instrument fitted with the prism is set on a compass repeater for observing the bearing of the sun?
azimuth circle
48
What type of vessel should not impede the safe passage of any vessel following a traffic lane as per provision under rule 10?
fishing vessel
49
How does the gyro compass repeated reproduce the indication of the master gyro compass?
through the accurate electronic servo mechanism
50
What is the unit of magnetic induction?
gauss
51
How does the air move in sea breeze?
wind moves from ocean to land
52
You are planning a voyage from San Francisco to Japan. Which publication contains information on the ocean routes?
sailing directions
53
How can you identify age to navigation marking the intercostal waterway?
by yellow stripes, squares or triangles marked on them
54
Consider a place approaching a channel when the height of HW is 3.8 meters.The vessels draught is 2.5 meters. What is the under keel clearance Over a rock of drying height 0.9 meters?
under keel clearance = 0.4 m at high water
55
What would you call the number of lines of forcing crossing a given surface area in magnetic field?
magnetic flux
56
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
57
What is the difference between the true north and magnetic north?
variation
58
How could you determine the existence of the conditions that allow thunderstorms to be developed?
a plentiful supply of moisture and steep lapse rate through a large vertical extent and a trigger action
59
What should you expect the Agulhas Current to present when on an Atlantic Ocean voyage from New York to Durban, South Africa?
strong head current
60
On a chart, cardinal marks of the compass indicates the position of a danger and the direction of the safe side. How would you determine am EAST cardinal mark?
it is painted black with yellow bands
61
How high clouds, composed of small white flakes or scaly globular masses, and often bonded together to form a "macarel sky" would be classified?
cirrocumulus
62
How would you classify the circular line limiting the observer view at sea?
it is the visible horizon
63
At 1045H, your GPS fixes your position at latitude 21° 0 1.75' N and long 172 degrees 48.40° W. You are steering a course of 086 degrees 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
64
How could you determine the mixed (time and clear) icing is most likely to be encountered?
in nimbustratus cloud at a temperature of -10° C
65
What is your idea of a cold wall?
it is the sudden line of demarcation separating the gulf stream and the labrador current
66
Which of the following statement is true about fixing a position on a given situation. At 0000 you fix your position and plot a new DR track line. At 0200 you again fix your position and it is 0.5 mile east of your reckoned position.
the drift is 0.25 knot per hour
67
How are air masses and ocean currents connected to each other?
warm of air masses warm ocean currents
68
In general, the most effective period for observing stars and planets occurs during the darker limit of___
civil twilight
69
In the horizon system of coordinates what is equivalent to the meridian angle of the celestial equator system?
azimuth angle
70
How would you ensure the reliability when transferring a position from global positioning system to a nautical chart?
make sure that the chart and the GPS use same datum
71
How would you ensure the operational readiness of steering system in case of emergency?
simple operating instructions of the steering system should be displayed in the wheelhouse
72
Other than the sun and moon, which of the following celestial body is the brightest object in the sky?
venus
73
A gyro compass error in which dumping is accompanied by offsetting the point of
tangent latitude error
74
What is meant by acronym VDR?
voyage data recorder
75
Your vessels heading is 330° pgc and 345° psc with a 2° E gyro error. If there is a variation of 13°W, what is the deviation on on this heading
0°
76
What is meant by speed over the ground?
it is the ship actual speed with respect to the earth
77
Polaris always appears due north in the sky to a precision better than how many degree?
one degree
78
Arrange the order of the following sextants: I. Form parallel telescope and sextant frame arrangement. II. Make horizon glass perpendicular to sextant frame. III. Form a parallel arrangement of the index mirror and horizon glass to the sextant frame when index arm is in zero. IV. Place the index mirror perpendicular to the second frame.
IV, II, III, I
79
What is the light color (when fitted) of the port hand lateral marks used in IALA Region A?
Red
80
Magnets in the binacles of magnetic compasses are used to reduce the effect of
deviation
81
How would you ensure that the vessel position is correct at all times during coastal navigation?
the bearings by the magnetic compass must be corrected for variation and deviation
82
If you observe an excessive noise from the steering gear, how would you rectify it?
air must be removed from the system using vent valve provided in the cylinder and pump specially after the oil system is replenished with new oil
83
If the ship is proceeding towards the magnetic equator, what will happen to the uncorrected deviation due to permanent magnetism?
decreases
84
What information does the outer ring of a compass rose on a nautical chart provide?
true direction
85
In navigation, what is meant by commissioned?
the action of placing a previously discontinued aid to navigation back in operation
86
What is your idea of a Cold Sector?
it is the area of a depression occupied by cold air at the surface and comprises the whole depression after the occluding process has been completed
87
How would you perform correction to old charts?
check that the edition is currently in the cumulative notice to mariners against the chart number and the number of uncorrected notices. start my correcting the latest correction first and proceed backwards until all the notices are corrected.
88
Which of the following operational principle is applied on an electronic depth finder?
sound waves travel at a constant speed through water
89
In what way can RADAR be an aid to weather forecasting especially when weather messages are incomplete or not available?
showers at long range appears on the screen only if moderate or heavy rain falls
90
Based on what you know, what is your opinion of dew point?
it is the temperature to which unsaturated air must be cooled at constant pressure and constant water vapour content
91
On a chart, cardinal marks of the compass indicates the position of a danger and the direction of the safe side. How would you determine a NORTH cardinal mark?
it is painted black over yellow
92
Automatic device for steering a vessel by means of control signals received from a gyro compass is called_______
gyro pilot
93
What is the tendency of magnetic lines of induction to concentrate on material or hypermiability?
magnetic shielding
94
How would you plan your course if it is crossing a TSS?
plan a course that is perpendicularly or as near as perpendicular
95
What is the line drawn on a chart through phases having the same value of magnetic dip?
isoclinal
96
What is the term used to describe the the time necessary for a lightning duration aid to perform a full cycle of life changes sown in the light list?
lightning cycle duration
97
How do gyro compass repeated replicate the direction reading of the master gyro compass?
accurate electronic servo mechanism
98
What is the variation of a compass if the true heading is 215° and the magnetic heading is 223°?
8°W
99
How would you determine the aneroid barometers approximate height correction?
the height in feet above sea level increased by 10% and divided by 30 gives correction in hectopascals to be added
100
On a chart, cardinal marks of the compass indicates the position of a danger and the direction of the safe side. How would you determine a WEST cardinal marks?
it is painted yellow with black bands