AE Magnetism

Question 1

Hvort er residual deviation eða einfaldlega deviation noted on the compass card after a swinging procedure?

Answer 1

Residual deviation

Question 2

Inclination of earth’s magnetic field at the north magnetic pole is equal to X°

Answer 2

90°

Question 3

Accelerating on an easterly heading in the northern hemisphere, the compass card will turn clockwise/anti clockwise, giving an apparent turn towards what direction?

Answer 3

Clockwise, giving an apparent turn towards the north.

Held að trikkið hér er að compass cardið er að snúast í hina áttina miðað við hvert þú beygir.

Question 4

Magnetic dip is the angle between the ______ and the _____.

Answer 4

Magnetic needle and the local horizontal.

Question 5

Hvað heitir græjan sem “detects horizontal component of earth’s magnetic field”?

Answer 5

Flux valve

Question 6

Errorið í “value of magnetic field indication” í flux valve er…

Answer 6

minna en 0.5%

Question 7

The red pole of a freely suspended magnet will point towards ……. and at latitude 60°N will point ……. at an angle known as the angle of …….

Answer 7

the North magnetic pole, downwards, dip

Question 8

If the total force of the earth’s field at a point is T and the horizontal and vertical components H and Z, the value of H is found by the formula:

a. H = T sin dip
b. H = Z tan dip
c. H = T cos dip
d. H = T tan dip

Answer 8

c. H = T cos dip

Question 9

The directive force of the earth’s magnetic field is greatest where?

Answer 9

magnetic equator

Question 10

The slow change in the earth’s magnetic variation is known as the ……. change and is caused by …….

a. annual, westerly movement of the magnetic pole
b. diurnal, easterly movement of the magnetic pole
c. secular, westerly movement of the magnetic pole
d. annual, sunspot activity

Answer 10

c. secular, westerly movement of the magnetic pole

Question 11

Which of the following materials are classed as ferromagnetic:

a. iron, steel, carbon-fibre
b. nickel, iron, steel
c. copper, iron, carbon steel
d. iron, cobalt steel, chromium steel

Answer 11

d. iron, cobalt steel, chromium steel

Held að svarið við þessu sé bara steel og iron.. rétt svar verður held ég að innihalda þessi orð.

Question 12

The magnetic moment of a magnet:

a. is the product of pole strength and effective length
b. varies inversely as the square of the distance between the poles
c. varies directly as the square of the distance between the poles
d. decreases as the magnet length increases

Answer 12

a. is the product of pole strength and effective length

Question 13

In a standby direct reading compass there is:

a. a non-pendulously mounted magnet system
b. a single pendulously mounted bar magnet
c. a circular magnet or pair of bar magnets pendulously mounted
d. a low magnetic moment system, either of circular or bar configuration

Answer 13

c. a circular magnet or pair of bar magnets pendulously mounted

Lykilorðið: pair og magnets pendulously mounted.

Question 14

The main requirements of a direct reading magnetic compass are that it should be:
a. horizontal, sensitive, periodic
b. easily read, floating in a transparent liquid, quick to react to change in aircraft
heading
c. positioned directly in front of the pilot, easily corrected for magnetic
deviation, aperiodic
d. aperiodic, horizontal, sensitive

Answer 14

d. aperiodic, horizontal, sensitive

Lykilorðið: direct reading magnetic compass er Aperiodic. Aperiodic þýðir að það er búið að dempa út vibrations.

Question 15

For a position in the southern hemisphere, the effect of acceleration errors are greatest on headings:

a. 180° and 360°
b. 045° and 225°
c. 135° and 315°
d. 090° and 270°

Answer 15

d. 090° and 270°

Question 16

Hvar eru beygjuskekkjur mestar?

Answer 16

Miðbaug

Question 17

An aircraft in the southern hemisphere is turning from a heading of 090°C to 360°C using a DGI. At the end of the turn the compass will read ……. than 360° and liquid swirl will ……. this effect.

Answer 17

less, decrease.

Grunar að þetta sé “less” því mælirinn er lively (fer lengra) og fer því t.d. á 340° í stað °360 og það er tæknilega séð “less.”

Question 18

In a standby compass the magnet system is immersed in a transparent liquid. The purpose of this liquid is to:

a. increase sensitivity, increase aperiodicity
b. increase sensitivity, decrease aperiodicity
c. increase sensitivity at high latitudes, lubricate bearings
d. increase sensitivity, reduce liquid swirl

Answer 18

a. increase sensitivity, increase aperiodicity

increase sensitivity: annars væri erfiðara fyrir mælinn að “kicka sér af stað”.
increase aperiodocity: Þetta þýðir bara að þú er að “þýða” út víbringinn.

Question 19

To improve the horizontality of a compass, the magnet assembly is suspended from a point:

a. on the centre line of the magnet
b. below the centre of gravity
c. above the centre of gravity
d. varying with magnetic latitude

Answer 19

c. above the centre of gravity

Question 20

The magnitude, and sense, of turning error shown by a direct reading compass varies with:

1. the design of the compass
2. the direction of the turn
3. the rate of turn
4. which hemisphere the aircraft is in
5. the heading of the aircraft
6. the amount of dip at the aircraft’s latitude

Answer 20

allt

Question 21

During a sustained turn ……. the nearer magnetic pole, the effect of liquid swirl will ……. compass turning error.

a. away from; increase
b. towards; not affect
c. away from; not affect
d. towards; increase

Answer 21

d. towards; increase

Question 22

When carrying out a turn at the magnetic equator there will be:
a. no turning error
b. a tendency to under-read turns through south and over-read turns through
north
c. a tendency to under-read turns due to liquid swirl
d. no turning error when turning through east or west

Answer 22

c. a tendency to under-read turns due to liquid swirl

Question 23

European regulations (EU OPS-1) state that the maximum permissible deviations after compensation are __ degree for a remote indicating compass, and ___ degrees for a direct reading magnetic compass

Answer 23

one, ten

Question 24

Compass swings should be carried out:

a. on the apron
b. only on the compass swinging base or site
c. at the holding point
d. on the active runway

Answer 24

b. only on the compass swinging base or site

Question 25

Aircraft magnetism caused by vertical soft iron:

a. varies with magnetic heading but not with magnetic latitude
b. varies with magnetic latitude but not with heading
c. it is not affected magnetic latitude or heading
d. varies as the cosine of the compass heading

Answer 25

b. varies with magnetic latitude but not with heading

Question 26

Aircraft magnetism caused by hard iron:

a. is not usually influenced by the earth’s magnetic field
b. varies directly with magnetic latitude
c. varies indirectly with magnetic latitude
d. is maximum on east and west

Answer 26

a. is not usually influenced by the earth’s magnetic field

Question 27

The aim of a compass swing is to eliminate or reduce the coefficients found. True or false?

Answer 27

True (among others).

Question 28

Deviation due to coefficient A is mainly caused by:

a. hard iron force acting along the longitudinal axis
b. hard and soft iron forces acting along the lateral axis
c. vertical soft iron forces
d. a misaligned lubber line

Answer 28

d. a misaligned lubber line

Question 29

A gyro-magnetic compass or magnetic heading reference unit is an assembly which always consists of:
1 - a directional gyro
2 - a vertical axis gyro
3 - an earth’s magnetic field detector 
4 - an azimuth control
5 - a synchronizing control

Answer 29

1 - a directional gyro
3 - an earth’s magnetic field detector
5 - a synchronizing control

Question 30

A slaved directional gyro derives its directional signal from:

a. a direct reading magnetic compass
b. the flight director
c. the flux valve
d. the air data computer

Answer 30

c. the flux valve

Question 31

The gyro-magnetic compass torque motor:

a. causes the directional gyro unit to precess
b. causes the heading indicator to precess
c. feeds the error detector system
d. is fed by the flux valve

Answer 31

a. causes the directional gyro unit to precess

Question 32

The heading information originating from the gyro-magnetic compass flux valve is sent to the:

a. error detector
b. erector system
c. heading indicator
d. amplifier

Answer 32

a. error detector

Question 33

The input signal of the amplifier of the gyro-magnetic compass resetting device originates from the:

a. directional gyro erection device
b. error detector
c. flux valve
d. directional gyro unit

Answer 33

b. error detector

Question 34

A flux valve senses the changes in orientation of the horizontal component of the earth’s magnetic field:
1 - the flux valve is made of a pair of soft iron bars
2 - the primary coils are fed AC voltage
3 - the information can be used by a “flux gate” compass or a directional gyro
4 - the flux gate valve casing is dependent on the aircraft three inertial axis
5 - the accuracy of the value of the magnetic field indication is less than 0.5%

Answer 34

2, 3, 5

hlýtur að vera villa með 5.

Question 35

The sensitivity of a direct reading magnetic compass is:
Select one:

a. inversely proportional to the vertical component of the Earth’s magnetic field
b. inversely proportional to the horizontal component of the Earth’s magnetic field
c. proportional to the horizontal component of the Earth’s magnetic field
d. inversely proportional to the vertical and horizontal components of the Earth’s magnetic field

Answer 35

c. proportional to the horizontal component of the Earth’s magnetic field