In modern fathometers the sonic or ultrasonic sound waves are produced electrically by means of a(n) __________.?
A) transmitter B) transducer C) transceiver D) amplifier E)NULL
Arşivler Sorular
Before a magnetic compass is adjusted certain correctors must be checked to ensure that they are free of permanent magnetism. These correctors are the __________.?
A) fore-and-aft and athwartships magnets B) dip needle and heeling magnet C) heeling magnet and Flinders bar D) Flinders bar and quadrantal spheres E)NULL
Which type of daymark is used to mark the starboard side of the channel when entering from sea?
A) Red and white octagon B) Black and white diamond C) Red triangle D) Green square E)NULL
The “head of the bend” is the __________.?
A) top or upstream beginning of a bend B) bottom or downstream beginning of a bend C) midpoint or center radius of a bend D) center line or apex of a bend E)NULL
The lubber’s line on a magnetic compass indicates __________.?
A) compass north B) the direction of the vessel’s head C) magnetic north D) a relative bearing taken with an azimuth circle E)NULL
A daymark used to indicate the safe water in a channel will have the shape indicated by which letter in illustration D045NG?
A) A B) B C) C D) D E)NULL
How many fixed objects are needed to plot a running fix?
A) None B) One C) Two D) Three E)NULL
Tropical cyclones do not form within 5° of the Equator because __________.?
A) there are no fronts in that area B) it is too hot C) it is too humid D) of negligible Coriolis force E)NULL
On 14 April 1981, a back sight is taken of the upper limb of the Sun as seen in the telescope. The height of eye is 45 feet. The index error is 2.5′ on the arc. The sextant altitude (hs) is 117°14.6′. What is the observed altitude (Ho)?
A) 63°01.9′ B) 63°03.4′ C) 63°07.4′ D) 63°09.9′ E)NULL
The standard magnetic compass heading differs from the true heading by __________.?
A) compass error B) latitude C) variation D) deviation E)NULL