Vayudoot Aviation

1. Which of the following is the best definition of magnetic variation?

The angle between the true north and the compass north.

The angle between the magnetic heading and the magnetic north

The angle between the magnetic north and the true north.

The angle between the direction indicated on a magnetic compass and magnetic north.

2. Which of the following statements concerning earth magnetism is completely correct?

An isogonal is a line which connects places with the same magnetic variation ; the aclinic connects places with the same magnetic field strength.

An isogonal is a line which connects places with the same magnetic variation; the agonic line is the line of zero magnetic dip.

An isogonal is a line which connects places of equal dip; the aclinic is the line of zero magnetic dip.

An isogonal is a line which connects places with the same magnetic variation; the aclinic is the line of zero magnetic dip.

3. A negative (westerly) magnetic variation signifies that?

True North is West of Magnetic North

Compass North is West of Magnetic North

True North is East of Magnetic North

Compass North is East of Magnetic North

4. An aircraft's compass must be swung?

After a change of theatre of operations which leads to a change of magnetic longitude.

If the aircraft has been in the hangar for a long time and has been moved several times.

Every maintenance inspection.

If the aircraft has been subjected to hammering.

5. Which of the following statements concerning the earth's magnetic field is completely correct?

The blue pole of the earth's magnetic field is situated in North Canada.

At the earth's magnetic equator, the inclination varies depending on whether the geographic equator is north or south of the magnetic equator.

Dip is the angle between total magnetic field and vertical field component.

The earth's magnetic field can be classified as transient, semi-permanent or permanent.

6. What are indicated by isogrivs on a chart?

Lines of zero magnetic variation

Lines of equal effective horizontal magnetic force.

Lines of equal grivation

Lines of equal magnetic dip.

7. The annunciator of a remote Indicating compass system is used when?

Synchronising the magnetic and gyro compass elements

Compensating for deviation

Setting local magnetic variation

Setting the 'heading' pointer.

8. What is the main advantage of a remote indicating compass compared to a direct reading compass is that it?

It has less moving parts

It magnifies the earth's magnetic field in order to attain greater accuracy.

It requires less maintenance

It senses, rather than seeks, the magnetic meridian.

9. The magnitude of variation ?

Has a maximum of 180°

Is zero at the equator.

Has a maximum value of 45°E or 45°W

Has a maximum of 90°

10. What is the name for a line of equal magnetic variation?

An isogonal

An isocline

An isogriv

An isovar.

11. If variation is West?

Compass North is West of Magnetic North

True North Is East of Magnetic North

True North is West of Magnetic North

Magnetic North is West of compass North.

12. Isogonals are lines of equal?

Pressure

Wind velocity

Compass deviation

Magnetic variation

13. When using a direct reading magnetic compass in the northern hemisphere?

A longitudinal acceleration on a Westerly heading causes an apparent turn to the South.

A longitudinal acceleration on an Easterly heading causes an apparent turn to the South.

A longitudinal acceleration on an Easterly heading causes an apparent turn to the North

A longitudinal deceleration on an Westerly heading causes an apparent turn to the North.

14. What is the maximum value of dip that can be caused by the vertical component of terrestrial magnetism?

60º

90º

45º

180º

15. The angle between True North and Magnetic North is called?

Variation.

Drift

Compass error.

Deviation

16. Which of the following is correct when the variation is West?

Compass North is West of Magnetic North.

True North is West of Magnetic North.

True North is East of Magnetic North.

Magnetic North is West of Compass North

17. How is the direct reading magnetic compass made aperiodic or dead beat?

Using a pendulous suspension system for the magnetic assembly.

Positioning the magnetic assembly mass close to the compass point and using damping wires

Using the lowest possible viscosity liquid in the compass.

Using short magnets

18. A direct reading compass should be swung when?

The aircraft is stored for a long period and is frequently moved.

The aircraft has made more than a stated number of landings.

There is a large change in magnetic longitude.

There is a large, and permanent , change in magnetic latitude

19. Why are the detector units of a slaved gyro-compass system usually located in or near to the aircraft wingtips?

To minimise turning and acceleration errors.

To isolate the detector unit from the aircraft deviation sources.

To isolate the detector unit from the magnetic field of the Earth.

Having one detector unit in each wingtip, cancels out compass deviations.

20. Which of the following is the correct conversion from True to Compass?

True north 130, Variation 2E, Magnetic 128 ,Deviation -1 , Compass 127

True north 130, Variation 2E, Magnetic 132, Deviation -1, Compass 133

True north 130, Variation 2w, Magnetic 132, Deviation -1, Compass 133

True north 130, Variation 2W Magnetic 128 Deviation -1 , Compass127

21. An aircraft is on a heading of 135°C using a direct reading magnetic compass in the northern hemisphere. After carrying out a rate 1 turn for 30 seconds on what indicated heading should it roll out of the turn?

It is not possible to answer this question using the data provided.

225

More than 225

Less than 225

22. The agonic line?

Follows the geographical equator

Is midway between the magnetic north and south poles.

Is the shorter of the distance between the true and Magnetic North and south Poles.

Follows two separate paths out of the North polar regions. One currently passes through the USA while the other passes through Western Europe.

23. Where do isogonal lines converge?

At the North and South Magnetic and Geographical Poles.

At the North and South Magnetic Poles.

A the North Magnetic Pole.

At the magnetic equator.

24. At a specific location, the value of magnetic variation?

Depends on the type of compass installed

Varies slowly over time.

Depends on the true heading

Depends on the magnetic heading

25. The main advantage of a remote Indicating compass over a direct reading compass is that it?

Requires less maintenance

Is able to magnify the earth's magnetic field in order to attain greater accuracy.

Senses, rather than seeks, the magnetic meridian.

Has less moving parts.

26. In a remote indicating compass system the amount of deviation caused by aircraft magnetism and electrical circuits may be minimised by?

Positioning the master unit in the centre of the aircraft.

Mounting the detector unit in the wingtip.

The use of repeater cards.

Using a vertically mounted gyroscope.

27. The value of magnetic variation?

Has a maximum of 180º

Must be 0º at the magnetic equator.

Cannot exceed 90º

Varies between a maximum of 45º East and 45º West.

28. Isogrives are lines that connect positions that have?

The same grivation

The same horizontal magnetic field strength

The same variation

O° magnetic dip

29. What is the advantage of the remote indicating compass (slaved gyro compass) over the direct reading magnetic compass?

It is connected to a source of electrical power and so is more accurate

It is not affected by aircraft by aircraft deviation.

it senses the earth's magnetic field rather than seeks it, so is more sensitive.

It is lighter

30. Which of the following is true of the value of magnetic variation?

It varies between 45º East and 45º West.

It cannot exceed 90º

It is 0º at the magnetic equator.

It cannot exceed 180º

31. In northern hemisphere, during an acceleration in an easterly direction, the magnetic compass will indicate?

An increase in heading

An apparent turn to the South.

A heading of East

A decrease in heading

32. What is the maximum possible value of Dip Angle?

66°

45°

90°

180°

33. When accelerating on an easterly heading in the Northern hemisphere, the compass card of a direct reading magnetic compass will turn?

Clockwise giving an apparent turn toward the north.

Clockwise giving an apparent turn toward the south.

Anti-clockwise giving an apparent turn toward the north.

Anti-clockwise giving an apparent turn toward the south.

34. At which point on the surface of the earth is a magnetic compass most effective?

Approximately misway between the magnetic poles.

On the geographical equator.

Close to the magnetic north pole.

Close to the magnetic South Pole.

35. What is the angle between True North and Magnetic North known as ?

Dip

Variation

Deviation

Alignment error

36. Which of the following conversion from True to Compass is correct?

True 130 Variation 2E Magnetic 132 Deviation+1 C-131

True 130 Variation 2W Magnetic 132 Deviation +1 Compass 131

True 130 Variation 2E Magnetic 132 Deviation+1 C-133

True 130 Variation 2W Magnetic 132 Deviation +1 C-133

37. How is the direct reading magnetic compass made to be aperiodic (dead beat)?

Using the lowest practicable viscosity compass liquid

Using a pendulous suspension system for the magnetic assembly.

By keeping the magnetic assembly mass close to the compass point and by using damping wires.

Using long magnets.

38. Isogonic lines connect positions that have?

The same elevation.

0° variation

The same angle of magnetic dip.

The same variation.

39. The north and south magnetic poles are the only positions on the earth's surface where?

Isogonals converge.

The value of magnetic variation equals 90°

A freely suspended compass needle will stand horizontal.

A freely suspended compass needle will stand vertical.

40. Why are the detector units in slaved gyro compass usually fitted in or close to the wingtips of an aircraft?

In order to reduce or eliminate turning and acceleration errors.

Having one detector in each wingtip, cancels out compass deviation.

In order to isolate the detector unit from the terrestrial magnetic field.

In order to isolate the detector unit from the aircraft deviation sources.

41. what is magnetic variation?

the angle between the direction indicated on the compass and Magnetic North.

the angle between Magnetic Heading and Magnetic North.

the angle between magnetic North and True North

the angle between True North and Compass North.

42. An aircraft is over position HO (55° 30'N 060 15'W), where YYR VOR (53° 30'N 060° 15'W) can be received. The magnetic variation is 31° W at HO and 28° W at YYR. What is the radial from YYR?

332°

208°

028°

031°

43. What is the title of a line of equal magnetic variation?

An isocline

An isogriv

An isogonal

An isobar

44. The variation is 20°E and you are heading 345°M when you take a radar bearing of an island which is 30° left of the nose. What bearing do you take a radar bearing of an island which is 30°left of the nose. What bearing do you plot?

180°T

170°T

160°T

155°T

45. What is the main cause of permanent magnetism in aircraft?

The combined effect of aircraft electrical equipment and the terrestrial magnetic field.

Electrical currents in internal wiring and electrical storms.

Exposure to the terrestrial magnetic field during normal operation.

Hammering, and the effect of the earth's magnetic field, whilst under construction.

46. Sensitivity of a direct reading magnetic compass is?

proportional to horizontal component of the magnetic field of the earth.

proportional to the vertical component of the magnetic field of the earth.

inversely proportlonal to the vertical and horizontal components of the magnetic field of the earth.

inversely proportional to horizontal component of the magnetic field of the earth.

47. The horizontal component of the earth's magnetic field?

Weakens with Increasing distance from the nearer magnetic pole.

Is approximately the same at all magnetic latitudes less than 60º

Weakens with Increasing distance from the magnetic poles.

Is approximately the same at magnetic latitudes 50º N and 50ºS.

48. Where do the isogonal lines converge?

At the both the North and South Geographic Poles.

Only at the Magnetic equator

At both the North and South Magnetic Poles.

Only at the Magnetic North Pole.

49. The lines on the earth's surface that join points of equal magnetic variation are called?

Isotachs

Isoclines

Isogrives

Isogonals

50. The sensitivity of a direct reading compass varies?

Directly with the horizontal component of the earth's magnetic field.

Inversely with both vertical and horizontal components of the earth's magnetic field.

Directly with the vertical component of the earth's magnetic field.

Inversely with the vertical component of the earth's magnetic field.

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