更多"The magnetic compass operates on th"的相关试题:
[单项选择]The compass error of a magnetic compass that has no deviation is（）.
A. zero
B. equal to variation
C. eliminated by adjusting the compass
D. constant at any geographical location
[单项选择]Magnetic compass deviation（）.
A. varies depending upon the bearing used
B. is the angular difference between magnetic north and compass north
C. is published on the compass rose on most nautical charts
D. is the angular difference between geographic and magnetic meridians
[单项选择]The standard magnetic compass heading differs from the true heading by（）.
A. compass error
B. latitude
C. variation
D. deviation
[单项选择]The principal purpose of magnetic compass adjustment is to（）.
A. reduce the variation as much as possible
B. reduce the deviation as much as possible
C. reduce the magnetic dip as much as possible
D. allow the compass bowl to swing freely on its gimbals
[单项选择]What are the only magnetic compass correctors that correct for both permanent and induced effects of magnetism?（）
A. Quadrantal spheres
B. Heeling magnets
C. Athwartships magnets
D. Fore-and-aft magnets
[单项选择]The Flinders bar on a magnetic compass compensates for the（）.
A. induced magnetism in vertical soft iron
B. induced magnetism in horizontal soft iron
C. permanent magnetism in ship's steel
D. vessel's inclination from the vertical
[单项选择]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
[单项选择]Which would influence a magnetic compass（）.
A. Electrical wiring
B. Iron pipe
C. Radio
D. All of the above
[单项选择]What is an advantage of the magnetic compass aboard vessels?（）
A. Compass error is negligible at or near the earth's magnetic poles
B. It does not have to be checked as often
C. It is reliable due to it's essential simplicity
D. All points on the compass rose are readily visible
[单项选择]Error may be introduced into a magnetic compass by（）.
A. making a structural change to the vessel
B. a short circuit near the compass
C. belt buckles
D. All of the above
[单项选择]When adjusting a magnetic compass using the fore-and-aft permanent magnets，you should（）.
A. use the magnets one at a time，putting one in one side and then one on the opposite side，one step higher
B. use the magnets in pairs，starting at the top，with trays at the highest point of travel
C. use the magnets in pairs，from the bottom up，with the trays at the lowest point of travel
D. fill all the trays with magnets，then remove them one-by-one until the deviation is removed
[单项选择]When adjusting a magnetic compass for error，a deviation table should be made（）.
A. before correcting for any deviation
B. after correcting for variation
C. after adjusting the fore-and-aft and athwartships permanent magnets
D. before the quadrantal correctors are placed on the compass
[单项选择]The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic force. This magnetic force is GREATEST at the（）.
A. north magnetic pole
B. south magnetic pole
C. magnetic prime vertical meridian
D. magnetic equator
[单项选择]The error in a magnetic compass caused by the vessel’s magnetism is called（）.
A. variation
B. deviation
C. compass error
D. bearing error
[单项选择]If a magnetic compass is not affected by any magnetic field other than the Earth’s，which statement is TRUE?（）.
A. Compass error and variation are equal
B. Compass north will be true north
C. Variation will equal deviation
D. There will be no compass error
