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COMPASS GNAV PERGUNTAS
1.
Variation is defined as the angle between:
a) TN and CN.
b) MN and CN.
c) CN and the longitudinal axis of the aircraft.
d) TN and MN
2.
For a position in the southern hemisphere, the effect of acceleration errors are greatest on headings:
a) 180° (C) and 360° (C) .
b) 045° (C) and 225° (C) .
c) 090° (C) and 270° (C) .
d) 135° (C) and 315° (C) .
3.
A compass swing is used to:
a) get true north and lubber line aligned.
b) align magnetic north with true north.
c) align compass north with magnetic north.
d) align compass north with true north.
4.
In a standby direct reading compass there is:
a) a non-pendulously mounted magnet system.
b) a circular magnet or pair of bar magnets pendulously mounted.
c) a low magnetic moment system, either of circular or bar configuration.
d) a single pendulously mounted bar magnet.
5.
During deceleration following a landing in Northerly direction, the magnetic compass will indicate:
a) a heading fluctuating about 360° .
b) an apparent turn to the West.
c) an apparent turn to the East.
d) no apparent turn.
6.
During deceleration following a landing in a southerly direction, a magnetic compass made for the northern hemisphere indicates:
a) an apparent turn to the east.
b) no apparent turn only on northern latitudes.
c) no apparent turn.
d) an apparent turn to the west.
7.
What should be the indication on the magnetic compass when rolling into a standard rate turn to the right from a south heading in the Northern Hemisphere?
a) The compass will remain on south for a short time, then gradually catch up to the magnetic heading of the airplane.
b) The compass will indicate the approximate correct magnetic heading if the roll into the turn is smooth.
c) The compass will indicate a turn to the right, but at a faster rate than is actually occurring.
d) The compass will indicate a turn to the left.
8.
The magnetic heading can be derived from the true heading by means of a:
a) map showing the isoclinic lines.
b) map showing the isogonal lines.
c) deviation correction curve.
d) compass swinging curve.
9.
The detector unit of a remote indicating compass is normally:
a) fixed in the vertical plane only.
b) free in the vertical.
c) fixed in the azimuth.
d) free in the horizontal plane.
10.
Aircraft magnetism:
a) varies with aircraft heading and latitude
b) does not vary with aircraft heading or latitude
c) does not vary with aircraft latitude but does vary with aircraft heading
d) varies with latitude but does not vary with aircraft heading
11.
In a steep turn, the northerly turning error on a magnetic compass on the northern hemisphere is:
a) none on a 270° heading in a left turn.
b) equal to 180° on a 090° heading in a right turn.
c) equal to 180° on a 270° heading in a right turn.
d) none on a 090° heading in a right turn.
12.
A picture of a remote indicating compass is attached. What are the components X, Y and Z?
a) ac excitation, pick-off coil and rotor
b) pick-off coil, rotor and stator
c) pick-off coil, stator and rotor
d) stator, ac excitation and pick-off coil
13.
The quadrantal deviation of a magnetic compass is corrected by using:
a) hard iron pieces.
b) pairs of permanent magnets.
c) magnetized needles.
d) soft iron pieces.
14.
Concerning magnetic compasses, deviation is:
a) Compass North.
b) A card in the cockpit showing compass heading errors.
c) The angular difference between magnetic North and compass North.
d) The angular difference between magnetic North and true North.
15.
The directive force of the earth's magnetic field:
a) increases as the magnetic variation increases.
b) increases as magnetic latitude increases.
c) is greatest at the magnetic equator.
d) varies with the heading of the aircraft.
16.
The purpose of the Annunciator unit of the Remote Indicating compass is to:
a) show whether the compass is operating either in the GYRO or COMPASS mode
b) advise if the gyro is subject to excessive wander
c) display the serviceability of the compass
d) indicate that the gyro is synchronised with the detector unit
17.
When turning from 060° to 320° in the Northern Hemisphere the direct reading compass will .... (i) causing an .... (ii) indication of the turn. Liquid Swirl will .... (iii) the error:
a) (i) under read (ii) over (iii) decrease
b) (i) under read (ii) over (iii) increase
c) (i) over read (ii) under (iii) increase
d) (i) over read (ii) under (iii) decrease
18.
In the Northern Hemisphere, a magnetic compass will normally indicate a turn towards North if:
a) a right turn is entered from an east heading.
b) an aircraft is accelerated while on an east or west heading.
c) a left turn is entered from a west heading.
d) an aircraft is decelerated while on an east or west heading.
19.
In the northern hemisphere, during deceleration following a landing in an Easterly direction, the magnetic compass will indicate:
a) a constant heading.
b) a heading fluctuating about 090° .
c) an apparent turn to the North.
d) an apparent turn to the South.
20.
An aircraft in the southern hemisphere is turning from a heading of 045° (C) to 315° (C) using a DGI. At the end of the turn the compass will read... than 315° and liquid swirl will... this effect.
a) more; decrease.
b) less, decrease.
c) more, increase.
d) less, increase.
21.
Which of the following statements are correct:
a) Dip is inversely proportional to H
b) Dip decreases with increased in latitude
c) Dip is proportional to H
d) Dip is inversely proportional to Z
22.
Which of the following will effect a direct reading compass?
ferrous metals
non-ferrous metals
electrical equipment
a) 1 and 3.
b) 1 only.
c) 1 and 2.
d) all 3.
23.
An aircraft turns left from 045° to 315° in the Southern Hemisphere. The magnets turn (i) .... and liquid swirls (ii) ... causing an error.
a) (i) clockwise (ii) anti-clockwise
b) (i) anti-clockwise (ii) anti-clockwise
c) (i) clockwise (ii) clockwise
d) (i) anti-clockwise (ii) clockwise
24.
In the Southern hemisphere, during deceleration following a landing in a Westerly direction, the magnetic compass will indicate:
a) a heading fluctuating about 270°
b) an apparent turn to the South
c) an apparent turn to the North
d) no apparent turn
25.
The main cause of error in a DRMC is:
a) magnetic deviation.
b) crosswinds - particularly on east/west headings.
c) turning.
d) parallax in the rose.
26.
If the CH = 220° , var. = E12, dev. = W2, what is the corresponding TH?
a) TH = 230° .
b) TH = 210° .
c) TH = 234° .
d) TH = 206° .
27.
In a remote indicating compass, direction sensing is achieved by means of:
a) a magnet mounted in the unit which is always located in the port wing.
b) the RMI which acts as a master indicator, transmitting signals to the aircraft instruments regarding heading.
c) a detector unit which is attached to the aircraft structure and senses the value of DIP to establish the aircraft position in the earth's field.
d) detection of the earth's magnetic flux and uses the direction and intensity of the flux density, measured in a magnetic bar to indicate direction.
28.
The main requirements of a direct reading magnetic compass are that it should be:
a) aperiodic, horizontal, sensitive.
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) horizontal, sensitive, periodic.
29.
The deviating effect of vertical soft iron .... (i) with decrease of magnetic latitude, due to the .... (ii) of H and the .... (iii) of Z:
a) (i) decreases (ii) increase (iii) increase
b) (i) decreases (ii) increase (iii) decrease
c) (i) increases (ii) decrease (iii) decrease
d) (i) increases (ii) decrease (iii) increase
30.
When accelerating on a westerly heading in the Northern Hemisphere the needle of the DIC will:
a) Turn anti-clockwise giving an apparent turn towards north
b) Turn clockwise giving an apparent turn towards north
c) Turn anti-clockwise giving an apparent turn towards south
d) Turn clockwise giving an apparent turn towards south
31.
An aircraft is taking off on a runway heading 045 deg, in still air, with a compass having 0 deg deviation. The runway is on an agonic line. What will the compass read if you are in the northern hemisphere?
a) compass remains on 045° .
b) compass moves to less than 045° .
c) compass stays on 045° if wings are kept level.
d) compass moves to more than 045° .
32.
A pilot wishes to turn left on to a northerly heading with 10° bank at a latitude of 50° North. Using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of:
a) 330° .
b) 355° .
c) 030° .
d) 015° .
33.
Among the errors of a magnetic compass, are errors:
a) in North seeking, due to bank angle and magnetic heading.
b) of parallax, due to oscillations of the compass rose.
c) due to Schuler type oscillations.
d) due to cross-wind gusts particularly on westerly or easterly headings.
34.
An aircraft is fitted with a direct reading magnetic compass. Upon landing in a northerly direction the compass will indicate:
a) no change.
b) a turn towards East.
c) a turn towards West.
d) an oscillation to its North alignment.
35.
A pilot wishes to turn left on to a southerly heading with 20° bank at a latitude of 20° North. Using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of:
a) 160° .
b) 170° .
c) 190° .
d) 200° .
36.
In the Southern hemisphere, during deceleration following a landing in an Easterly direction, the magnetic compass will indicate:
a) a heading fluctuating about 090° .
b) no apparent turn.
c) an apparent turn to the South.
d) an apparent turn to the North.
37.
A pilot wishes to turn right on to a southerly heading with 20° bank at a latitude of 20° North. Using a direct reading compass, in order to achieve this he must stop the turn on an approximate heading of:
a) 190° .
b) 150° .
c) 170° .
d) 210
38.
With reference to the flux valve of a remote indicating compass:
a) the flux valve is not subject to acceleration errors.
b) the flux valve is pendulously mounted and is free to turn to remain aligned with the earth magnetic field.
c) the flux valve is fixed to the aircraft and so turns with the aircraft to measure the angle between the aircraft and the earth's magnetic field.
d) the flux valve is pendulously mounted and so it is not subject to or affected by the earth's magnetic field.
39.
The main reason for having the centre of gravity below the pivot point in a card-type magnetic compass is:
a) To compensate for the vertical magnetic component Z such that the magnet system is within approx. 2° of the true horizontal between 60° N and 40° S.
b) To make it less sensitive to hard- and soft-iron magnetism in the aircraft.
c) To compensate for the horizontal magnetic component H such that the magnet system is within approx. 2° of the true horizontal between 60° N and 40° S.
d) To cancel out the systems pendulosity and its tendency to oscillate backwards and forwards about its equilibrium position.
40.
An aircraft takes off on a runway with an alignment of 45° . The isogonic line on the area chart indicates 0° . The compass deviation is 0° . On a takeoff with zero wind, the northerly turning error:
a) will be null if the wings are kept level
b) is such that the compass will indicate a value noticeably below 045°
c) is such that the compass will indicate a value noticeably above 045°
d) will be null
41.
During deceleration following a landing in a Southerly direction, the magnetic compass will indicate:
a) an apparent turn to the West.
b) no apparent turn.
c) a heading fluctuating about 180° .
d) an apparent turn to the East.
42.
During a sustained turn... the nearer magnetic pole, the effect of liquid swirl will... compass turning error.
a) away from; not affect.
b) towards; increase.
c) towards; not affect.
d) away from; increase.
43.
The quadrantal deviation of the magnetic compass is due to the action of:
a) the hard iron pieces influenced by the mild iron pieces.
b) the hard iron ices and the soft iron pieces influenced by the hard iron pieces.
c) the soft iron pieces influenced by the geomagnetic field.
d) the hard iron pieces influenced by the geomagnetic field.
44.
The purpose of a compass swing is to attempt to coincide the indications of:
a) compass north and magnetic north.
b) true north and magnetic north.
c) compass north and true north.
d) compass north and the lubber line.
45.
To improve the horizontality of a compass, the magnet assembly is suspended from a point:
a) above the centre of gravity.
b) below the centre of gravity.
c) on the centre line of the magnet.
d) varying with magnetic latitude.
46.
The compass heading can be derived from the magnetic heading by reference to a:
a) map showing the isoclinic lines.
b) compass swinging curve.
c) map showing the isogonic lines.
d) deviation correction curve.
47.
If an aircraft, fitted with a DRMC, takes off on a westerly heading, in the northern hemisphere, the DRMC will indicate:
a) a turn to south.
b) a turn to the north.
c) no turn.
d) oscillates about west.
48.
The fields affecting a magnetic compass originate from:
magnetic masses
ferrous metal masses
non ferrous metal masses
electrical currents
The combination of correct statements is:
a) 1, 2, 4.
b) 1, 2, 3, 4.
c) 1, 3, 4.
d) 1, 2, 3.
49.
Magnetic compass swinging is carried out to reduce as much as possible:
a) variation.
b) deviation.
c) regulation.
d) acceleration.
50.
The purpose of compass swinging is to determine the deviation of a magnetic compass:
a) on a given heading.
b) on any heading.
c) at a given latitude.
d) at any latitude.
51.
The principal advantage of a gyromagnetic compass (slaved gyro compass) is:
a) It does not precess
b) None of the above
c) It combines the north-seeking ability of the magnetic compass with the stability of the direction indicator
d) It does not have to be aligned with the north
52.
A remote indicating compass has usually less deviation error than a panel mounted compass because:
a) it receives a higher flux-density from the earth's magnetic field.
b) the indication system consists of toroidal-wound coils forming a Magnesyn system with little interference.
c) it is normally mounted in a part of the airplane where magnetic interference is minimal.
d) it is carrying a well damped floating magnet.
53.
In a standby compass the magnet system is immersed in a transparent liquid. The purpose of this liquid is to:
a) increase sensitivity, decrease aperiodicity.
b) increase sensitivity at high latitudes, lubricate bearings.
c) increase sensitivity, reduce liquid swirl.
d) increase sensitivity, increase aperiodicity.
54.
When carrying out a turn at the magnetic equator there will be:
a) a tendency to underread turns due to liquid swirl.
b) no turning error.
c) no turning error when turning through east or west only.
d) a tendency to underread turns through south and overread turns through north.
55.
When accelerating on an easterly heading in the northern Hemisphere, the magnet system of a direct reading magnetic compass will:
a) Turn anti-clockwise, indicating an apparent turn towards north
b) Turn clockwise, indicating an apparent turn towards south
c) Turn clockwise, indicating an apparent turn towards north
d) Turn anti-clockwise, indicating an apparent turn towards south
56.
The " sensor part" of the flux-valve is:
a) Separate GPS signal receiver
b) The two pick-up coils
c) Separate electronic magnetic compass
d) The three pick-up coils
57.
In the Northern hemisphere, during deceleration following a landing in a Westerly direction, the magnetic compass will indicate:
a) an apparent turn to the North.
b) an apparent turn to the South.
c) no apparent turn.
d) a heading fluctuating about 270° .
58.
When turning onto a northerly heading the rose of a magnetic compass tends to " undershoot;" when turning onto a southerly heading it tends to " overshoot" :
these compass indications are less reliable in the northern hemisphere than in the southern hemisphere.
these compass oscillations following a lateral gust are not identical if the aircraft is heading north or south.
this behaviour is due to the mechanical construction of the compass.
this behaviour is a symptom of a badly swung compass.
The correct statements are:
a) 1, 2, and 4.
b) 1 and 3.
c) 2, 3, and 4.
d) 2 and 3.
59.
A pilot wishes to turn right on to a northerly heading with 20° bank at a latitude of 40° North. Using a direct reading compass, in order to achieve this he must stop the turn on to an approximate heading of:
a) 350°
b) 010°
c) 330°
d) 030°
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