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NAV-LX-MODULE4
1.
Isogonic lines connect positions that have:
a) the same angle of magnetic dip
b) the same variation
c) the same elevation
d) 0° variation
2.
Compass deviation is defined as the angle between:
a) Magnetic North and Compass North
b) True North and Compass North
c) True North and Magnetic North
d) the horizontal and the total intensity of the earth's magnetic field
3.
The angle between True North and Magnetic North is called :
a) drift
b) deviation
c) variation
d) compass error
4.
Deviation applied to magnetic heading gives:
a) compass heading
b) magnetic course
c) true heading
d) magnetic track
5.
Isogrives are lines that connect positions that have:
a) the same horizontal magnetic field strength
b) the same grivation
c) the same variation
d) O° magnetic dip
6.
An Agonic line is a line that connects:
a) positions that have the same variation
b) points of equal magnetic dip
c) points of equal magnetic horizontal field strength
d) positions that have 0° variation
7.
The lines on the earth's surface that join points of equal magnetic variation are called:
a) isogonals
b) isoclines
c) isotachs
d) isogrives
8.
A negative (westerly) magnetic variation signifies that :
a) Compass North is East of Magnetic North
b) Compass North is West of Magnetic North
c) True North is East of Magnetic North
d) True North is West of Magnetic North
9.
What is the value of the magnetic dip at the magnetic south pole ?
a) 0°
b) 60°
c) 90°
d) 45°
10.
The value of magnetic variation:
a) has a maximum of 180°
b) varies between a maximum of 45° East and 45° West
c) must be 0° at the magnetic equator
d) cannot exceed 90°
11.
Isogonals converge at the:
a) North magnetic pole only
b) Magnetic equator
c) North and South magnetic poles only
d) North and South geographic and magnetic poles
12.
A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an:
a) aclinic line
b) agonic line
c) isogonal
d) isotach
13.
The horizontal component of the earth's magnetic field:
a) is approximately the same at magnetic latitudes 50°N and 50°S
b) weakens with increasing distance from the magnetic poles
c) weakens with increasing distance from the nearer magnetic pole
d) is approximately the same at all magnetic latitudes less than 60°
14.
When is the magnetic compass most effective?
a) On the geographic equator
b) In the region of the magnetic South Pole.
c) In the region of the magnetic North Pole.
d) About midway between the magnetic poles
15.
Complete the following statement regarding magnetic variation. . The charted values of magnetic variation on earth normally change annually due to?
a) a reducing field strength causing numerical values at all locations to decrease.
b) magnetic pole movement causing numerical values at all locations to increase.
c) magnetic pole movement causing numerical values at all locations to increase or decrease
d) an increasing field strength causing numerical values at all locations to increase.
16.
The Earth can be considered as being a magnet with the:
a) red pole near the north pole of the earth and the direction of the magnetic force pointing straight up from the earth's surface
b) blue pole near the north pole of the earth and the direction of the magnetic force pointing straight down to the earth's surface
c) blue pole near the north pole of the earth and the direction of the magnetic force pointing straight up from the earth's surface
d) red pole near the north pole of the earth and the direction of the magnetic force pointing straight down to the earth's surface
17.
Which of the following statements concerning earth magnetism is completely correct?
a) An isogonal is a line which connects places with the same magnetic variation; the aclinic is the line of zero magnetic dip
b) An isogonal is a line which connects places of equal dip; the aclinic is the line of zero magnetic dip
c) An isogonal is a line which connects places with the same magnetic variation; the aclinic connects places with the same magnetic field strength
d) An isogonal is a line which connects places with the same magnetic variation; the agonic line is the line of zero magnetic dip
18.
Which of the following statements concerning the earth's magnetic field is completely correct?
a) The earth's magnetic field can be classified as transient, semi-permanent or permanent
b) Dip is the angle between total magnetic field and vertical field component
c) The blue pole of the earth's magnetic field is situated in North Canada
d) At the earth's magnetic equator, the inclination varies depending on whether the geographic equator is north or south of the magnetic equator
19.
The sensitivity of a direct reading compass varies:
a) inversely with the vertical component of the earth's magnetic field
b) inversely with both vertical and horizontal components of the earth's magnetic field
c) directly with the vertical component of the earth's magnetic field
d) directly with the horizontal component of the earth's magnetic field
20.
Isogonals are lines of equal :
a) magnetic variation.
b) pressure.
c) wind velocity.
d) compass deviation.
21.
At a specific location, the value of magnetic variation:
a) depends on the true heading
b) depends on the magnetic heading
c) depends on the type of compass installed
d) varies slowly over time
22.
The angle between Magnetic North and Compass North is called:
a) alignment error
b) magnetic variation
c) compass error
d) compass deviation
23.
Permanent magnetism in aircraft arises chiefly from:
a) exposure to the earth's magnetic field during normal operation
b) the combined effect of aircraft electrical equipment and the earth's magnetic field
c) hammering, and the effect of the earth's magnetic field, whilst under construction
d) the effect of internal wiring and exposure to electrical storms
24.
Concerning direct reading magnetic compasses, in the northern hemisphere, it can be said that :
a) on a Westerly heading, a longitudinal deceleration causes an apparent turn to the North
b) on an Easterly heading, a longitudinal acceleration causes an apparent turn to the North
c) on an Easterly heading, a longitudinal acceleration causes an apparent turn to the South
d) on a Westerly heading, a longitudinal acceleration causes an apparent turn to the South
25.
The purpose of compass check swing is to:
a) measure the angle between Magnetic North and Compass North
b) cancel out the vertical component of the earth's magnetic field
c) cancel out the horizontal component of the earth's magnetic field
d) cancel out the effects of the magnetic fields found on board the aeroplane
26.
In a remote indicating compass system the amount of deviation caused by aircraft magnetism and electrical circuits may be minimised by:
a) mounting the detector unit in the wingtip
b) using a vertically mounted gyroscope
c) positioning the master unit in the centre of the aircraft
d) the use of repeater cards
27.
A direct reading compass should be swung when:
a) there is a large, and permanent, change in magnetic latitude
b) there is a large change in magnetic longitude
c) the aircraft is stored for a long period and is frequently moved
d) the aircraft has made more than a stated number of landings
28.
The direct reading magnetic compass is made aperiodic (dead beat) by:
a) keeping the magnetic assembly mass close to the compass point and by using damping wires
b) pendulous suspension of the magnetic assembly
c) using the lowest acceptable viscosity compass liquid
d) using long magnets
29.
The annunciator of a remote indicating compass system is used when:
a) compensating for deviation
b) synchronising the magnetic and gyro compass elements
c) setting local magnetic variation
d) setting the 'heading' pointer
30.
Which one of the following is an advantage of a remote reading compass as compared with a standby compass?
a) It senses the magnetic meridian instead of seeking it, increasing compass sensitivity
b) It is lighter than a direct reading compass because it employs, apart from the detector unit, existing aircraft equipment
c) It eliminates the effect of turning and acceleration errors by pendulously suspending the detector unit
d) It is more reliable because it is operated electrically and power is always available from sources within the aircraft
31.
Which of the following is an occasion for carrying out a compass swing on a Direct Reading Compass?
a) Whenever an aircraft carries a large freight load regardless of its content
b) After any of the aircraft radio equipment has been changed due to unserviceability
c) After an aircraft has passed through a severe electrical storm, or has been struck by lightning
d) Before an aircraft goes on any flight that involves a large change of magnetic latitude
32.
The main reason for mounting the detector unit of a remote reading compass in the wingtip of an aeroplane is:
a) to minimise the amount of deviation caused by aircraft magnetism and electrical circuits
b) to maximise the units exposure to the earth's magnetic field
c) to ensure that the unit is in the most accessible position on the aircraft for ease of maintenance
d) by having detector units on both wingtips, to cancel out the deviation effects caused by the aircraft strucure
33.
The main reason for usually mounting the detector unit of a remote indicating compass in the wingtip of an aeroplane is to:
a) reduce the amount of deviation caused by aircraft magnetism and electrical circuits
b) place it where it will not be subjected to electrical or magnetic interference from the aircraft
c) place it in a position where there is no electrical wiring to cause deviation errors
d) facilitate easy maintenance of the unit and increase its exposure to the Earth's magnetic field
34.
The main advantage of a remote indicating compass over a direct reading compass is that it:
a) senses, rather than seeks, the magnetic meridian
b) has less moving parts
c) requires less maintenance
d) is able to magnify the earth's magnetic field in order to attain greater accuracy
35.
The north and south magnetic poles are the only positions on the earth's surface where:
a) a freely suspended compass needle will stand vertical
b) a freely suspended compass needle will stand horizontal
c) the value of magnetic variation equals 90°
d) isogonals converge
36.
Which of the following statements about hard and soft iron in relation to magnetism is correct?
a) Hard iron magnetism is permanent in nature, and soft iron magnetism is non-permanent.
b) Both hard and soft iron magnetism are of a permanent nature.
c) Both hard and soft iron magnetism are of a non-permanent nature.
d) Hard iron magnetism is non-permanent in nature, and soft iron magnetism is permanent.
37.
The direction of magnetic north at a certain position coincides with the direction of?
a) The horizontal component of the earth's magnetic field.
b) The isogonal line to the magnetic north pole.
c) The great circle to the magnetic north pole.
d) The isoclinic line to the magnetic north pole.
38.
In a remote indicating compass system the amount of deviation caused by the aircraft magnetism and electrical circuits may be minimised by?
a) Using a vertically mounted gyroscope instead of a horizontally mounted one.
b) Mounting the detector unit (flux valve) in the wingtip.
c) Positioning the gyroscope in the centre of the aircraft.
d) Mounting the flux valve in the cockpit.
39.
Near the magnetic pole?
a) The angle of dip is maximal whereby a freely suspended compass needle will be almost fully horizontally aligned.
b) The horizontal component of the earth's magnetic field is too small to permit the use of magnetic compasses.
c) The vertical component of the earth's magnetic field is too small to permit the use of magnetic compasses.
d) The angle of dip is minimal whereby a freely suspended compass needle will be almost fully vertically aligned.
40.
The long term periodic change in the Earth's Magnetic Field?
a) Is caused by the westerly movement of the geographic North Pole.
b) Is reflected in the slow movement of the magnetic poles.
c) Acts mainly on compass deviation.
d) I caused by sunspot activity.
41.
The directive force?
a) Is about twice as strong on 60N/S as on the equator.
b) Is the component of the Earth's magnetic field which aligns the compass needle.
c) equals the vertical component of the Earth's magnetic field.
d) Is zero at the geographic poles.
42.
The horizontal component of the Earth's magnetic field?
a) Is very small close to the magnetic poles.
b) Increases with an increase in magnetic latitude.
c) Is minimum at the magnetic equator.
d) Is maximum at the magnetic poles.
43.
The direction "Magnetic North" at a position on the earth is?
a) The great circle between the position and the magnetic north pole.
b) The isogonal to the magnetic north pole.
c) The compass north at that position, corrected for variation.
d) The direction of the horizontal component of the earth's magnetic field at that position.
44.
A definition of a magnetic track angle is?
a) The direction of a line referenced to isogonic line to the magnetic north pole. Compass north.
b) The direction of the longitudinal axis of an aircraft to compass north.
c) The direction of the longitudinal axis of an aircraft to magnetic north.
d) The direction of a line referenced to magnetic north.
45.
With an increase in magnetic latitude there will be a decrease in the?
a) Directive force.
b) Vertical component of the Earth's magnetic field.
c) Total magnetic force of the Earth's magnetic field.
d) Angle of dip.
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