National Maritime Center Providing Credentials to Mariners Q382 Navigation General-Rivers (Sample Examination) Page 1 of 14
Choose the best answer to the following Multiple Choice Questions. 1. The Light List indicates that a dayboard is a type KGW. You should take which action? o (A) Leave it to port when southbound on the Atlantic Coast ICW o (B) Pass it close aboard on either side o (C) Look for a green and white diamond (D) Look for another daymark to form the range 2. The dry-bulb temperature is 78 F (26 C) and the wet-bulb temperature is 68 F (20 C). What is the relative humidity? o (A) 10% o (B) 24% o (C) 56% (D) 60% 3. The Light List shows that a navigational light has a nominal range of 18 miles and a height above water of 22 feet (6.7 meters). Your height of eye is 16 feet (4.9 meters) and the visibility is 2.0 miles. At which approximate range will you first sight the light? o (A) 2.0 miles o (B) 2.7 miles o (C) 4.2 miles (D) 5.8 miles 4. Which term defines a submerged dike extending from the bank of the river used to train the channel? o (A) A cutoff o (B) A landwall o (C) A towhead (D) A wingdam Page 2 of 14
5. A daymark used to indicate the safe water in a channel will have which of the shapes shown in illustration D045NG below? o (A) A o (B) B (C) C o (D) D 6. Which information does the outer ring of a compass rose on a nautical chart provide? (A) True directions o (B) Magnetic directions o (C) Variation o (D) Annual rate of variation change 7. When is a revised print of a chart made? (A) When a low-stock situation occurs and minor corrections are made o (B) Every two years to update the magnetic variation information o (C) When there are numerous corrections to be made or the corrections are extensive o (D) After every major hydrographic survey of the area covered by the chart 8. Which type of daymark is used to mark the starboard side of the channel when entering from sea? (A) Red triangle o (B) Red and white octagon o (C) Black and white diamond o (D) Green square 9. A towboat is pushing barges ahead at a dangerously fast speed when. (A) water comes over the foredeck of the lead barges o (B) the towboat vibrates when backing down o (C) a strain is placed on the face wires o (D) the roostertail exceeds the height of the main deck Page 3 of 14
10. Which of the Nautical Texts is/are published by the U.S. Coast Guard? o (A) Radio Navigational Aids o (B) U.S. Coast Pilots (C) Light Lists o (D) All of the above 11. What does the symbol shown in illustration D033NG below indicate on a chart? o (A) A red and white can buoy (B) A safe water beacon o (C) A can buoy with a rotating white light o (D) A sunken vessel marked by a buoy If choice B is selected set score to 1. 12. Temperature and moisture characteristics are modified in a warm or cold air mass due to which factor? o (A) Upper level atmospheric changes o (B) The heterogeneous nature of the air mass (C) Movement of the air mass o (D) Pressure changes in the air mass 13. A bluff bar is a bar. o (A) extending out from a bluff alongside the river (B) that has a sharp drop off into deep water o (C) that is perpendicular to the current o (D) that tends to give a false indication of its position If choice B is selected set score to 1. 14. When adjusting a magnetic compass for error, which is TRUE concerning the deviation table? (A) Construct the table after adjusting the fore-and-aft permanent magnets o (B) Construct the deviation table before correcting for any deviation o (C) Construct the deviation table before the quadrantal correctors are placed on the compass o (D) Construct the deviation table after correcting for variation Page 4 of 14
15. Fog generally clears when the. o (A) wind speed increases o (B) wind direction changes o (C) temperature increases (D) All of the above 16. Prior to reading an aneroid barometer, why should you tap the face lightly with your finger? o (A) To contract and expand the glass face o (B) To demagnetize the metal elements o (C) To expose any loose connections (D) To bring the pointer to its true position 17. Which term describes a tow that is properly aligned to pass through a narrow opening between two bridge piers or any other critical navigational maneuver? o (A) On course o (B) Headed fair (C) In shape o (D) Holding on 18. Which term is used to describe the wind speed and direction observed from a moving vessel? o (A) The coordinate wind (B) The apparent wind o (C) The true wind o (D) The anemometer wind If choice B is selected set score to 1. 19. Which term describes a light, feathery deposit of ice caused by the sublimation of water vapor directly into the crystalline form, on objects whose temperatures are below freezing? o (A) Dew o (B) Snow (C) Frost o (D) Glaze Page 5 of 14
20. While passing through Memphis, the weather report on the TV news indicates that a cold front is crossing western Kentucky and Tennessee. Tomorrow's weather will be dominated by a high pressure area. What weather should you expect tomorrow? o (A) Low overcast; mild temperatures with light, steady rain or drizzle o (B) Scattered clouds with light, southeasterly winds; high humidity and possibly fog (C) Moderate winds from the northwest, clear visibility and cooler temperatures o (D) Light, southerly winds; high humidity and possibly fog 21. What is a system of reservoirs and connecting tubes in a gyro compass called? o (A) The gyrotron o (B) The rotor (C) The mercury ballistics o (D) The spider element 22. Which is TRUE on the Western Rivers when a vessel downbound with a following current is meeting an upbound vessel? o (A) She does not have the right of way, since the other vessel is not crossing the river. (B) She has the right of way only if she is a power-driven vessel. o (C) She must wait for a whistle signal from the upbound vessel. o (D) She has the right of way only if she has a tow. If choice B is selected set score to 1. 23. What results when warm moist air blows over a colder surface and is cooled below its dew point? (A) Advection fog o (B) Ice fog o (C) Frost smoke o (D) Radiation fog 24. Information markers, when lighted, will display which color light? (A) White lights o (B) Red lights o (C) Green lights o (D) Yellow lights Page 6 of 14
25. You sight a buoy fitted with a double-sphere topmark. If sighted at night, what color and light sequence would you expect to see? o (A) A quick-flashing red light o (B) A quick-flashing green light (C) A flashing white light showing a group of two flashes o (D) A flashing red light showing a group of three flashes 26. Which term is used to describe a generally circular low pressure area? (A) A cyclone o (B) A cold front o (C) An occluded front o (D) An anticyclone 27. Which statement about gyrocompass error is TRUE? o (A) Any error shown by a gyro repeater will be the same as the error of the master compass. o (B) The sign (E or W) of the error will change with different headings of the ship. o (C) Any error will remain constant unless the compass is stopped and restarted. (D) The amount of the error and the sign will generally be the same on all headings. 28. A facility used for the discharge of a cargo of a particular hazard, such as chlorine, butane or ethane, must have what to warn water traffic of an immediate danger during fire or cargo release? (A) A siren or rotating flashing light o (B) Buoys with flashing lights controlled from shore, located one-half mile upstream and downstream of the facility o (C) An emergency boat and crew o (D) Flashing red lights located one-half mile upstream and downstream of the facility 29. By convention, the Earth's south magnetic pole is which color? o (A) White o (B) Black o (C) Blue (D) Red Page 7 of 14
30. If within 500 yards (460m) of a Northern Right Whale you are lawfully obligated to take which actions? o (A) Slow to bare steerageway until the whale swims away o (B) Turn away from the whale and leave at full speed o (C) Stop the vessel and sound repeated blasts on the ship's whistle to scare the whale away (D) Turn away from the whale and leave at slow speed 31. The light characteristic of flashing is used in the Aids to Navigation System on the Western Rivers. Which example is required to utilize this characteristic? o (A) Preferred channel buoys o (B) Lights marking the left descending bank o (C) Daymarks with no lateral significance (D) Lights marking the right descending bank 32. Under the U.S. Aids to Navigation System on the Western Rivers, what color are the buoys marking the starboard side of the channel when going upstream? o (A) Black o (B) Yellow (C) Red o (D) Green 33. Under the U.S. Aids to Navigation System on the Western Rivers, which is TRUE of a preferred channel buoy? o (A) It shall be vertically-striped red and white o (B) It shall be solid green o (C) It shall be solid red (D) It shall be horizontally-banded red and green 34. In the IALA Buoyage System, what do buoys with alternating red and green horizontal bands indicate? (A) The preferred channel o (B) An isolated danger o (C) Fishing areas o (D) Spoil grounds Page 8 of 14
35. Which condition(s) is(are) necessary for the formation of dew? (A) Clear skies o (B) Moderate wind o (C) A surface warmer than the dew point of the air o (D) Available nuclei in the air 36. How do preferred channel buoys indicate the preferred channel to transit? o (A) The location of the buoy in the channel junction o (B) The buoy's light rhythms (C) The color of their top band o (D) Odd or even numbers 37. When operated over a muddy bottom, a fathometer may indicate which of the following? (A) Two depth readings o (B) No depth reading o (C) A zero depth reading o (D) A shallow depth reading 38. How is the draw span of a floating drawbridge marked? o (A) With a flashing blue lights o (B) With three red lights on each side of the draw o (C) With a yellow and white diamond (D) With a yellow light showing Morse Code (B) 39. When does a Doppler speed log indicate speed over ground? (A) When senseing the bottom in depths of less than 600 feet o (B) The unit can only speed over ground when there is no current o (C) At all times o (D) When the unit is in the volume reverberation mode Page 9 of 14
40. You are holding position above Gallipolis Lock and Dam when you hear two long blasts of the horn from the lock. This indicates that you should take which action? o (A) Hold position for two upbound tows o (B) Enter the landward chamber (C) Enter the riverward chamber o (D) Hold position until the lower gates are closed 41. Under the U.S. Aids to Navigation System, a special mark possesses which of the following characteristics? (A) May show a yellow light with a flashing rhythm o (B) May show a light with the Morse code "A" rhythm o (C) Must be lighted with a fixed or flashing white light o (D) Must be lighted with a yellow isophase light 42. What can be expected with the presence of stratus clouds and a dying wind? o (A) Clearing skies o (B) Heavy rain o (C) Heavy snow (D) Thick fog 43. You are in a channel in U.S. waters near an industrial plant with a load/discharge facility for barges. You see an emergency rotating flashing light on the facility light up. What does this indicate? (A) There is danger at the facility due to a fire or cargo release. o (B) A barge at the facility has commenced transferring a hazardous cargo. o (C) A barge carrying a hazardous cargo is mooring or unmooring at the facility. o (D) The facility is warning a barge to shut down transfer operations due to weather conditions (electrical storm, tornado, hurricane, etc.). 44. You are entering an east coast port and see a buoy with a yellow triangle painted on it. What does the symbol indicate? (A) You are in the vicinity of the ICW o (B) The buoy designates a sharp turn in the channel o (C) The buoy is a special mark o (D) The buoy is off station Page 10 of 14
45. What is published by the U.S. Coast Guard? o (A) Tide Tables o (B) Nautical Charts (C) Light List o (D) U.S. Coast Pilot 46. A vessel crossing a river on the Western Rivers has the right of way over. o (A) vessels ascending the river o (B) vessels descending the river o (C) all vessels ascending and descending the river (D) None of the above 47. The datum from which the predicted heights of tides are reckoned in the tide tables is. o (A) the highest possible level o (B) given in table three of the tide tables (C) the same as that used for the charts of the locality o (D) mean low water 48. You are approaching a vertical lift bridge. How do you know when the span is fully open? o (A) A yellow light is illuminated on the bridge pier o (B) Three white lights in a vertical line are lit (C) A range of two green lights under the lift span are lit o (D) A red light starts to flash at about 60 times a minute 49. Under the IALA Buoyage Systems, which is TRUE of safe water marks? o (A) They must show a composite group-flashing, Fl(2 + 1), green light o (B) They may show a quick-flashing, Q(9)15s, white light o (C) They may show a composite group-flashing, Fl(2 + 1), red light (D) They may show a white Morse (A) light Page 11 of 14
50. What weather change accompanies the passage of a cold front in the Northern Hemisphere? o (A) Steady precipitation, gradually increasing in intensity (B) A line of cumulonimbus clouds o (C) Wind shift from northeast clockwise to southwest o (D) Steady dropping of barometric pressure If choice B is selected set score to 1. Page 12 of 14
National Maritime Center Providing Credentials to Mariners D033NG 5/23/2016 Adapted for testing purposes only Further reproduction prohibited without permission Page 13 of 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