磁罗经与陀螺罗经的使用题库 - 考试题库

【单选题】

[1/58]The compass heading of a vessel differs from the true heading by（）.

A.

compass error

B.

variation

C.

magnetic dip

D.

deviatio

参考答案：

A

参考解析：

无

【单选题】

[2/58]The magnetic compass magnets are acted on by the horizontal component of the Earth’s total magnetic ...

A.

north magnetic pole

B.

south magnetic pole

C.

magnetic prime vertical meridian

D.

magnetic equator

参考答案：

D

参考解析：

无

【单选题】

[3/58]By convention，the north seeking ends of a compass’ magnets are colored（）.

A.

Black

B.

ue

C.

Red

D.

White

参考答案：

C

参考解析：

无

【单选题】

[4/58]What is used to correct for both induced and permanent magnetism，and consequently must be readjusted...

A.

Flinders bar

B.

Soft iron spheres

C.

Fore-and-aft permanent magnets in their trays

D.

Heeling magnet

参考答案：

D

参考解析：

无

【单选题】

[5/58]The Flinders bar and the quadrantal spheres should be tested for permanent magnetism at what interva...

A.

They are not subject to permanent magnetism; no check is necessary

B.

Semiannually

C.

Annually

D.

Every five year

参考答案：

C

参考解析：

无

【单选题】

[6/58]Variation is a compass error that you（）.

A.

can correct by adjusting the compass card

B.

can correct by adjusting the compensating magnets

C.

can correct by changing the vessel's heading

D.

cannot correct

参考答案：

D

参考解析：

无

【单选题】

[7/58]The vertical angle between the horizontal and the magnetic line of force is the（）.

A.

elevation

B.

magnetic angle

C.

vertical angle

D.

di

参考答案：

D

参考解析：

无

【单选题】

[8/58]Variation is the angular measurement between（）.

A.

compass north and magnetic north

B.

compass north and true north

C.

magnetic meridian and the geographic meridian

D.

your vessel's heading and the magnetic meridia

参考答案：

C

参考解析：

无

【单选题】

[9/58]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

参考答案：

C

参考解析：

无

【单选题】

[10/58]The vertical component of the Earth’s magnetic field causes induced magnetism in vertical soft iron....

A.

The Flinders bar

B.

The heeling magnet

C.

Quadrantal soft iron spheres

D.

Bar magnets in the binnacle

参考答案：

A

参考解析：

无