COMPASS ZAK
The horizontal component of the earth magnetic field(Hf) will be running
From geographical south to geographical north
From magnetic south pole to magnetic north pole
Along the east-west direction
From magnetic north pole to magnetic south pole
In northern hemisphere, the vertical component of the earth magnetic field(Z) will be running
From magnetic south to magnetic north
Vertically upward
Vertically downward
From magnetic north pole to magnetic south pole
Coefficient______ is the maximum value of the semi-circular deviation which is caused by horizontal fore and aft component of the magnetic field at the compass position.
B
C
D
E
_______is magnetic material which is easy to magnetise, but also loses it magnetism easily.
Hard iron
Permanent iron
Soft iron
Permanent magnetism
Magnetic materials acquire a_____pole when the lines of force enter the material and a________pole when the lines of force leave the material
Red / red
Blue / blue
Red / blue
Blue / red
If the ship was built in southern hemisphere she should acquire______deck and______keel due to earth magnetic field.
Red / red
Blue / blue
Red / blue
Blue / red
Coefficient PB is corrected by
Sphere
Flinder bar
Athwartship permanent magnets
Fore and aft permanent magnets
Coefficient D is corrected by
Sphere
Flinder bar
Athwartship permanent magnets
Fore and aft permanent magnets
Maximum deviation for Coefficient B wil occur
090-270
000-180
045-235
135-315
Deviation caused by fore and aft permanent ship magnetism will be
Constant when moving from one latitude to another latitude
Increased when moving from lower latitude to higher latitude
Decreased when moving from lower latitude to higher latitude
Increased when moving from higher latitude to lower latitude
The induced magnetism by vertical component of earth's magnetic field will caused
Real A. D. E, IB and IC
Real A, D and E
IB. IC and D
IB and IC
The induced magnetism by horizontal component of earth's magnetie field will caused
Real A. D. E, IB and IC
Real A. D and E
IB. IC and D
IB and IC
Deviation caused by vertical soft iron of the ship will be
Constant when moving from one latitude to another latitude
Increased when moving from lower latitude to higher latitude
Decreased when moving from lower latitude to higher latitude
Increased when moving from higher latitude to lower latitude
Deviation caused by horizontal soft iron of the ship will be
Constant when moving from one latitude to another latitude
Increased when moving from lower latitude to higher latitude
Decreased when moving from lower latitude to higher latitude
Increased when moving from higher latitude to lower latitude
1
The above deviation curve will represent the effect of coefficient
+ PB
- PB
- PC
+PC
2
The above deviation curve will represent the effect of coefficient
+ PB
- PB
- PC
+PC
3
The above deviation curve will represent the effect of coefficient
+D
-D
+E
-E
4
The above deviation curve will represent the effect of coefficient
+D
-D
+E
-E
The vertical component of earth magnetic field(Z) is maximum at
Magnetic equator
Magnetic poles
Northern hemisphere
Souther hemisphere
When you're adjusting for your coefficient C, you vessel should be headed on
045
090
135
180
A ship built on the easterly heading will acquire a permanent______pole on the port side. A ship built on the northerly heading will acquire a permanent________pole on the bow.
Red / red
Red / blue
Blue / blue
Blue / red
The vertical soft iorn is induced by Z force. As latitude_________ , the amount of induction will____________and therefore the deviation will___________
Increase / decrease / decrease
Decrease / increase / decrease
Decrease / decrease / increase
Increase / increase / increase
Coefficient caused by a horizontal fore and aft magnetic field at the compass due to the induced magnetism in the vertical soft iron, forward or aft of the compass is__________
D
E
IB (induced B)
IC (induced C)
If you have corrected the effect of coefficient PB at one latitude and if you're moved to different latitude.
You do not need to adjust your fore and aft magnets
You need to adjust your fore and aft magnets
You need to adjust your athwartship magnets
You do not need to adjust your athwartship magnets
A sphere placed in the foreward and aft of the compass is to correct
Coefficient + D
Coefficient - D
Coefficient + E
Coefficient - E
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