National Maritime Center

Transcription

1 National Maritime Center Providing Credentials to Mariners (Sample Examination) Page 1 of 14

2 Choose the best answer to the following Multiple Choice Questions. 1. Sometimes foreign charts are reproduced by NGA. On such a chart a wire dragged (swept) area may be shown in purple or. o (A) red o (B) magenta (C) green o (D) yellow 2. The permanent magnetism of a vessel may change in strength due to. (A) major structural repair o (B) the nature of the cargo being carried o (C) changes in heading o (D) All of the above 3. Your vessel has a draft of 24 feet. On 7 April 1983 you wish to pass over a temporary obstruction near Lovell Island, MA, that has a charted depth of 22 feet. Allowing for a safety margin of 3.1 feet under your keel, what is the earliest time after 0100 EST (ZD +5) that this passage can be made? o (A) 0248 o (B) 0304 (C) 0342 o (D) When a magnetic compass is not in use for a prolonged period of time it should. o (A) be locked into a constant heading o (B) have the compensating magnets removed (C) be shielded from direct sunlight o (D) have any air bubbles replaced with nitrogen 5. Mechanical lifting of air by the upslope slant of the terrain is called. o (A) advective lifting o (B) convective lifting (C) topographic lifting o (D) vertical lifting Page 2 of 14

3 6. What will be the velocity and direction of the tidal current at Old Ferry Point, NY, at 1340 EST (ZD +5) on 5 February 1983? o (A) 0.8 knot at 060 T o (B) 0.8 knot at 240 T o (C) 1.0 knot at 076 T (D) 1.4 knots at 076 T 7. A white buoy with a blue band is. o (A) a hydrographic data collection buoy o (B) an isolated danger mark (C) a mooring buoy o (D) marking a restricted area 8. The datum from which the predicted heights of tides are reckoned in the tide tables is the same as that used for the charts of the locality. The depression of the datum below mean sea level for Hampton Roads, Virginia is. o (A) between -.7 and +.5 feet o (B) between 1.9 and 3.2 feet o (C) 4.1 feet (D) 1.2 feet 9. In illustration D045NG below, which shape is a daymark warning of danger? o (A) A (B) B o (C) C o (D) D 10. The ocean bottom that extends from the shoreline out to an area where there is a marked change in slope to a greater depth is the. o (A) borderland o (B) offshore terrace o (C) abyssal plain (D) continental shelf Page 3 of 14

4 11. The Light List indicates that a light has a nominal range of 14 miles and is 26 feet high. If the visibility is 4 miles and your height of eye is 20 feet, at what approximate distance will you sight the light? (A) 7.5 miles o (B) 9.6 miles o (C) 11.2 miles o (D) 14.0 miles 12. The dry-bulb temperature is 78 F and the wet-bulb temperature is 62 F. What is the relative humidity? o (A) 16% o (B) 24% (C) 39% o (D) 79% 13. Which of the following is a boundary between two air masses? o (A) continent o (B) isobar (C) front o (D) lapse rate 14. What will be the time of maximum flood current at Sagamore Bridge on the Cape Cod Canal during the morning of 6 December 1983 (ZD +5)? (A) 0708 o (B) 0712 o (C) 0716 o (D) The agonic line on an isomagnetic chart indicates the. (A) points where there is no variation o (B) magnetic equator o (C) points where there is no annual change in variation o (D) magnetic longitude reference line Page 4 of 14

5 16. The Light List indicates that a dayboard is a type NB. You should. o (A) see a black triangle o (B) look for another daymark forming a range (C) expect a daymark of no lateral significance o (D) check to enter the correct channel at the junction daymark 17. A hygrometer is a device used for determining. (A) relative humidity o (B) the absolute temperature o (C) atmospheric pressure o (D) wind velocity 18. Under the IALA-A and B Buoyage Systems, a buoy with alternating red and white vertical stripes indicates. o (A) that the preferred channel is to port (B) that there is navigable water all around o (C) that the preferred channel is to starboard o (D) an isolated danger exists 19. Atmospheric pressure at sea level is equal to. o (A) millibars o (B) inches of mercury o (C) 14.7 pounds per square inch (D) All of the above 20. What does not contribute to the commercial GPS receiver position error? (A) Ship's speed o (B) Satellite clock o (C) Satellites' orbits o (D) Atmospheric/Ionospheric propagation Page 5 of 14

6 21. The climate of the northern Gulf coast. o (A) has an east coast marine type of climate (B) is a warm marine type of climate o (C) is humid and subtropical throughout the year o (D) varies from warm to subtropical 22. In the U.S. Aids to Navigation System on the Western Rivers, the light characteristic of group flashing (2) is used for lights on. o (A) daymarks with no lateral significant (B) the left descending bank o (C) preferred channel buoys o (D) the right descending bank 23. What U.S. agency is responsible for NAVAREA warnings? (A) National Geospatial-Intelligence Agency o (B) National Oceanic and Atmospheric Administration o (C) National Ocean Service o (D) Coast Guard 24. The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the port side of a vessel. o (A) ascending the river o (B) proceeding from seaward (C) descending the river o (D) crossing the river 25. The hurricane season in the North Atlantic Ocean reaches its peak during the month of. o (A) June o (B) November (C) September o (D) July Page 6 of 14

7 26. Under the U.S. Aids to Navigation System, a yellow buoy is a. o (A) junction buoy (B) special purpose mark o (C) cardinal mark o (D) safe water buoy 27. The speed of sound in water is approximately. o (A) 1.5 times its speed in air o (B) 2.5 times its speed in air o (C) 3.5 times its speed in air (D) 4.5 times its speed in air 28. Wind velocity varies. o (A) inversely with the absolute humidity o (B) directly with the temperature of the air mass (C) directly with the pressure gradient o (D) inversely with the barometric pressure 29. The difference between the heights of low and high tide is the. o (A) distance o (B) depth o (C) period (D) range 30. The points on the earth's surface where the magnetic dip is 90 are. o (A) connected by the isoclinal line o (B) along the magnetic equator o (C) the isopors (D) the magnetic poles Page 7 of 14

8 31. While your vessel is proceeding down a channel you notice a range of lights in line with your vessel's mast. If your vessel is on course 001 per gyro compass and the charted value of the range of lights is 359 T, what is the gyro compass error? (A) 2 W o (B) 2 E o (C) 1 E o (D) 1 W 32. At 2221 your course is 222 pgc at a speed of 11.2 knots, when radar detects a buoy bearing 355 relative, at a range of 5.8 miles. The gyro error is 2 E. If you change course at 2226, what course should you steer to leave the buoy 1.0 mile abeam to port? o (A) 210 pgc (B) 228 pgc o (C) 231 pgc o (D) 206 pgc 33. Weather observations provided by each weather station include all of the following except. (A) predicted weather for the next twelve hours o (B) temperature o (C) barometric pressure and change in the last three hours o (D) visibility 34. Your vessel is steering 263 T at 22 knots. At 0413 a light bears 294 T and at 0421 the same light bears 312 T. What will be your distance off when abeam? o (A) 3.4 miles (B) 3.7 miles o (C) 4.3 miles o (D) 4.9 miles 35. Which factor(s) is/are used to develop the charted information of a lighthouse? (A) Height and intensity of the light o (B) Height of the observer and the intensity of the light o (C) Height of the light and the observer o (D) Height of the light only Page 8 of 14

9 36. The temperature at which the air is saturated with water vapor and below which condensation of water vapor will occur is referred to as the. (A) absolute humidity o (B) dew point o (C) precipitation point o (D) vapor point 37. The highest level of commercial navigational accuracy is provided by. o (A) SPS, without selective availability o (B) PPS, without selective availability o (C) NAVSAT, using the Doppler-shift (D) DGPS, within a coverage area 38. The area of strong westerly winds occurring between 40 S and 60 S latitude is called the. o (A) polar easterlies o (B) jet streams (C) roaring forties o (D) prevailing westerlies 39. Which statement describes the prevailing wind direction in mid-winter in the Gulf Coast area? o (A) 40% to 50% of mid-winter winds are from a southern quadrant. (B) 30% to 40% of mid-winter winds are from a northern quadrant. o (C) the winds are variable in speed, but strongest in March. o (D) None of the above 40. High clouds, composed of small white flakes or scaly globular masses, and often banded together to form a "mackerel sky", would be classified as. o (A) altostratus (B) cirrocumulus o (C) cirrus o (D) cumulonimbus Page 9 of 14

10 41. Which topmark shown in illustration D023NG below identifies an isolated danger? o (A) A (B) B o (C) C o (D) D 42. You are required to enter a lock on your voyage. Information on the lock regulations, signals, and radio communications can be found in. o (A) Bowditch (B) Coast Pilot o (C) the publication "Key to the Locks" o (D) Corps of Engineer Information Bulletin 43. A Doppler log in the bottom return mode indicates the. o (A) velocity of the current o (B) depth of the water (C) speed over the ground o (D) bottom characteristics 44. Which statement is TRUE concerning equatorial tides? o (A) They occur when the Moon is at maximum declination north or south. o (B) They occur when the Sun is at minimum declination north or south. (C) The difference in height between consecutive high or low tides is at a minimum. o (D) They are used as the basis for the vulgar establishment of the port. 45. Which describes privately maintained aids to navigation included in the Light List? o (A) must be conspicuously marked by a signboard with the words "PRIVATE AID" (B) must conform to the standards of the U.S. Aids to Navigation System o (C) are painted white and must use a white light if lighted o (D) are not permitted in or along first-class waterways and may be authorized for second- and third-class waterways Page 10 of 14

11 46. The time meridian used when computing the height of tide or the velocity of the current for Pensacola Bay, FL, is. o (A) 75 00'W (B) 90 00'W o (C) 82 30'W o (D) 97 30'W 47. When the Moon's declination is maximum north, which of the following will occur? o (A) Equatorial tides o (B) Higher high tides and lower low tides (C) Tropic tides o (D) Mixed-type tides 48. A vessel sighting a northern right whale dead ahead should. (A) alter course to give a wide clearance o (B) maintain course and speed o (C) report the whale's position to the Canadian Coast Guard o (D) All of the above 49. Under the U.S. Aids to Navigation System on the Western Rivers, passing daymarks on the right descending bank are. o (A) red triangular-shaped panels with red reflector borders o (B) red diamond-shaped panels with red reflector borders (C) green square-shaped panels with green reflector borders o (D) green triangular-shaped panels with green reflector borders 50. Which item in illustration D034NG below shows a Morse (A) light? o (A) A o (B) B o (C) C (D) D Page 11 of 14

12 National Maritime Center Providing Credentials to Mariners D023NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 12 of 14

13 National Maritime Center Providing Credentials to Mariners D034NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 13 of 14

14 National Maritime Center Providing Credentials to Mariners D045NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 14 of 14