A single vertical magnet placed underneath the compass in th

Which one of the followings is incorrect about magnetic compass?______.

A.The magentic compass is compulsory on my vessel

B.The magentic compass is prone to error

C.The magentic compass is always placed inside steel constructions

D.The magentic compass needs to be calibrated to compensate for local magnetic distortion

A deck beam does NOT ______．

A.act as a beam to support vertical deck loads

B.lessen the longitudinal stiffness of the vessel

C.act as a tie to keep the sides of the ship in place

D.act as a web to prevent plate wrinkling due to twisting action on the vessel

It’s for a single room and bath _____ Mr. Mark on the 10th of this month.

You are about to go to sea and adjust the magnetic compass．To expedite the adjustment at sea，in what order should the following dockside adjustments be made ________．

A.Flinders bar first，then the heeling magnet and spheres

B.Heeling magnet first，then the Flinders bar and spheres

C.Flinders bar first，then the spheres and heeling magnet

D.Spheres first，then the Flinders bar and heeling magnet

A single vertical magnet placed underneath the compass in the binnacle is used to compensate for ______．

A.The horizontal component of the permanent magnetism

B.Deviation caused by the vessel's inclination from the vertical

C.Induced magnetism in the horizontal soft iron

D.Induced magnetism in the vertical soft iron

A vessel is heading magnetic north and its magnetic compass indicates a heading of 003°. What action should be taken to remove this error during compass adjustment?

A.Move the quadrantal spheres closer to the compass

B.Raise the heeling magnet if the red end is up

C.Remove some of the Flinders bar

D.Raise or lower the athwartship magnets

Which compensates for errors introduced when the vessel heels over ________．

A.The soft iron spheres on the arms of the binnacle

B.Magnets placed in trays inside the binnacle

C.A single vertical magnet beneath the compass

D.The Flinders bar

A、on earth

B、in sight

C、in place

D、at a distance

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

During the day, a dredge will indicate the side on which it is safe to pass by displaying_____.

A.two balls in a vertical line

B.two diamonds in a vertical line

C.a single black ball

D.no shape is shown during the day