AE Magnetism Flashcards
Hvort er residual deviation eða einfaldlega deviation noted on the compass card after a swinging procedure?
Residual deviation
Inclination of earth’s magnetic field at the north magnetic pole is equal to X°
90°
Accelerating on an easterly heading in the northern hemisphere, the compass card will turn clockwise/anti clockwise, giving an apparent turn towards what direction?
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.
Magnetic dip is the angle between the ______ and the _____.
Magnetic needle and the local horizontal.
Hvað heitir græjan sem “detects horizontal component of earth’s magnetic field”?
Flux valve
Errorið í “value of magnetic field indication” í flux valve er…
minna en 0.5%
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 …….
the North magnetic pole, downwards, dip
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
c. H = T cos dip
The directive force of the earth’s magnetic field is greatest where?
magnetic equator
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
c. secular, westerly movement of the magnetic pole
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
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.
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
a. is the product of pole strength and effective length
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
c. a circular magnet or pair of bar magnets pendulously mounted
Lykilorðið: pair og magnets pendulously mounted.
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
d. aperiodic, horizontal, sensitive
Lykilorðið: direct reading magnetic compass er Aperiodic. Aperiodic þýðir að það er búið að dempa út vibrations.
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°
d. 090° and 270°
Hvar eru beygjuskekkjur mestar?
Miðbaug
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.
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.”
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
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.
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
c. above the centre of gravity
The magnitude, and sense, of turning error shown by a direct reading compass varies with:
- the design of the compass
- the direction of the turn
- the rate of turn
- which hemisphere the aircraft is in
- the heading of the aircraft
- the amount of dip at the aircraft’s latitude
allt
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
d. towards; increase
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
c. a tendency to under-read turns due to liquid swirl
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
one, ten
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
b. only on the compass swinging base or site
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
b. varies with magnetic latitude but not with heading
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
a. is not usually influenced by the earth’s magnetic field
The aim of a compass swing is to eliminate or reduce the coefficients found. True or false?
True (among others).
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
d. a misaligned lubber line
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
1 - a directional gyro
3 - an earth’s magnetic field detector
5 - a synchronizing control
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
c. the flux valve
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
a. causes the directional gyro unit to precess
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
a. error detector
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
b. error detector
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%
2, 3, 5
hlýtur að vera villa með 5.
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
c. proportional to the horizontal component of the Earth’s magnetic field
