Aiyura Aircraft Maintenance Engineering School_ AC66-2.

16 Compass Compensation_2024

SEMESTER ONE CLASS ACTIVITY #1

NAME:__________________________ CLASS:_____ /27mks

1. Compass need correction on three coefficients: Which of the following is not true?
A. A- Where the compass is misreading on all headings.
B. B- Where the compass is misreading on north east heading only.
C. C- Where the compass is misreading on north south headings only.

2. Angular is referring to or forming an angle, the angular difference between the direction of
magnetic north and compass north is called………………
A. Magnetic bearing
B. Deviation
C. Variation

3. Which of the following statement is not true?

Deviation-
A. The process of moving away from the normal position or path.
B. A magnetic compass error in a particular aircraft caused by magnetic influences in the
structure and equipment of the aircraft itself.
C. A force that draws things towards something.

4. What is a Compass?
A. An instrument usually with a magnetic needle which always points to the magnetic north.
B. A gyroscopic instrument which indicates direction but does not have a north-seeking magnet.
C. An instrument that is used to measure the speed of an aircraft.

5. What is Magnetize?
A. A force exerted by a magnetic field
B. To convert an object or material into a magnet.
C. Area of magnetic influence.

6. What is a Magnet?
A. An object that produces a magnetic field, and attracts iron and steel.
B. Area of magnetic influence.
C. A force exerted by a magnetic field

7. Properties of a Bar Magnet.

Since bar magnet is a permanent magnet, it will have the same properties as that of
permanent magnet. Which properties below of a bar magnet is not true.
A. It has two poles- North Pole and South Pole
B. It does not attracts iron and steel particles
C. Like pole repel each other, unlike poles attract each other.

8. North seeking poles

A. The pole of a magnet from which the lines of the magnetic flux are considered to leave.
B. The pole of a magnet from which the lines of the magnetic flux are considered to enter after
leaving the magnet at its north pole.
C. The pole of a magnet from which the lines of the magnetic flux are considered to enter after
leaving the magnet at its south pole.

Subect Coordinator: Mr Pascal Bune Page 1

 Aiyura Aircraft Maintenance Engineering School_ AC66-2.16 Compass Compensation_2024

9. The strength of the magnetic field of the electromagnet can be increased by

A. Either increasing the flow of voltage or the number of loops in the wire.
B. Either increasing the flow of current or the number of loops in the wire.
C. Either increasing the flow of current or decreasing the number of loops in the wire.

10. Coercivity;
A. The capability of a ferromagnetic material to hold up (resist) a peripheral magnetic field
without getting demagnetized.
B. It is used to determine how a material reacts to the applied magnetic field.
C. It is the amount of magnetism that a ferromagnetic material can maintain even after the
magnetic field is decreased to zero.

11. Magnetically Soft Materials

1. Technical properties of interest for soft magnets (see Silicon Steels) include:
i. high permeability (μ=B/H);
ii. low hysteresis loss, and
iii. low eddy current and anomalous losses

Which of the properties above is true for soft magnets?

A. i only
B. i & iii only
C. i, ii, & iii only

12. Diamagnetic materials are:

A. Materials have a weak, negative susceptibility to magnetic fields.
B. Materials have a small, positive susceptibility to magnetic fields.
C. Materials have a large, positive susceptibility to an external magnetic field.

13. Ferromagnetic materials are:

A. Materials have a weak, negative susceptibility to magnetic fields.
B. Materials have a small, positive susceptibility to magnetic fields.
C. Materials have a large, positive susceptibility to an external magnetic field.

14. True north, also called geodetic north or geographic north

A. Is the direction of the line of longitude that bisects the quadrangle.
B. It is a line on the earth’s surface, passing in the direction of the horizontal component of the
earth's magnetic field
C. Is a line joining the magnetic north pole with the magnetic south pole inside the earth.

15. The locus of the points having zero dip is called the
A. Isoclinal lines
B. magnetic equator or aclinic line
C. Isogonal lines

16. Cardinal headings refers to:

A. North and South only
B. North, South, East and West only
C. North East, South East, North West and South West only

Subect Coordinator: Mr Pascal Bune Page 2

 Aiyura Aircraft Maintenance Engineering School_ AC66-2.16 Compass Compensation_2024

17. ………………is a force that draws things towards something.

A. Repulsion
B. Attraction
C. Deviation

18. A magnetic compass error in a particular aircraft caused by magnetic influences in the
structure and equipment of the aircraft itself.
A. Magnetic bearing
B. Variation
C. Deviation

19. A direction or position relative to a fixed point measured in degrees on a compass.

A. Compass bearing
B. Compass
C. Variation

20. A piece of magnetizable material, such as hard steel, that has been exposed to a strong
magnetizing force.
A. Ferromagnet
B. Permanent magnet
C. Diamagnetic

21. Materials have a weak, negative susceptibility to magnetic fields.

A. Diamagnetic
B. Paramagnetic
C. Ferromagnetic

22. Materials have a large, positive susceptibility to an external magnetic field.

A. Diamagnetic
B. Paramagnetic
C. Ferromagnetic

23. ………………is a point on the surface of Earth's Northern Hemisphere at which

the planet's magnetic field points vertically downward (in other words, if a magnetic
compass needle is allowed to rotate in three dimensions, it will point straight down). There
is only one location where this occurs, near (but distinct from) the geographic north pole.
A. South magnetic pole
B. North magnetic Pole
C. Magnetic poles

24. True north is sometimes refered to as

A. Geodetic North
B. Geographic North
C. Both answers above (A&B) are correct

25. Which statement below is not true, the magnetic meridian:

A. Is a line joining the magnetic north pole with the magnetic South Pole inside the earth.
B. Is perpendicular with the earth’s magnetic lines of force.
C. Is parallel with the earth’s magnetic lines of force.

Subect Coordinator: Mr Pascal Bune Page 3

 Aiyura Aircraft Maintenance Engineering School_ AC66-2.16 Compass Compensation_2024

26. Magnetic Hysteresis-

A. The characteristic of a magnetic material that causes it to retain some magnetism after the
magnetizing force is removed.
B. Attractive magnetic forces pull two objects towards each other
C. the invisible, but measurable, force surrounding the permanent magnet or current-carrying
conductor

27. Magnetic field-

A. The pole of a magnet from which the lines of the magnetic flux are considered to leave.
B. The pole of a magnet from which the lines of the magnetic flux are considered to enter after
leaving the magnet at its north pole.
C. The invisible, but measurable, force surrounding the permanent magnet or current-carrying
conductor. This field is produced when the orbital axes of the electrons of the atoms in the
materials are all in alignment.

Subect Coordinator: Mr Pascal Bune Page 4