When hitting a solid object such as a ship or an airplane,the radar waves are reflected back ______ they came．

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• 1Your radar is set on a true motion display．Which of the following will NOT appear to moveacross the PPI scope、

  A.Echoes from a buoy

  B.Own ship's marker

  C.Echo from a ship on the same course at the same speed

  D.Echo from a ship on a reciprocal course at the same speed

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• 2When navigating in thick fog with the radar on, you should ______．

  A.station the look-out in the wheelhouse to keep a continuous watch on the radar

  B.secure the sounding of fog signals until a vessel closes within five miles

  C.station a look-out as low down and far forward as possible

  D.keep the radar on the shortest available range for early detection of approaching vessels

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• 3On a ship，a door that is required to be marked KEEP CLOSED is designed to ______．

  A.prevent the passage of flammable gases

  B.prevent the passage of poisonous vapors

  C.delay the spread of heat and flames

  D.maintain watertight integrity

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• 4A Doppler log in the bottom return mode indicates the ______．

  A.velocity of the current

  B.bottom characteristics

  C.depth of the water

  D.speed over the ground

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• 5On a vessel with a single propeller,transverse force has the most effect on the vessel when the engine is put ______．

  A.full ahead

  B.full astern

  C.half ahead

  D.slow astern

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• 6There is a possibility that small vessel, ice and other floating objects may not be ______ by radar at an adequate range．

  A.reflect

  B.shown

  C.detected

  D.defected

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• 7Indications of the master gyrocompass are sent to remote repeaters by the ______．

  A.follow-up system

  B.transmitter

  C.phantom element

  D.azimuth motor

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• 8Most LOG use the doppler shift of the carrier phase to compute ______．

  A.Latitude

  B.Longitude

  C.Speed

  D.Time

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• 9The correction to be applied to a Loran-C reading when matching a sky wave to a ground wave may be found ______．

  A.on loran charts covering areas where sky waves are used

  B.in the Radio Aids to Navigation PUB 117

  C.in the Loran-C Correction Tables

  D.Sky waves cannot be matched to ground waves in Loran-C to produce a usable reading

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• 10The most common type of davit found on merchant vessels today is the ______．

  A.radial

  B.sheath-screw

  C.gravity

  D.quadrantal

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