Vayudoot Aviation

1. Where do the isogonal lines converge?

At both the North and South Magnetic Poles.

Only at the Magnetic North Pole.

At the both the North and South Geographic Poles.

Only at the Magnetic equator

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

It cannot exceed 90º

It cannot exceed 180º

It varies between 45º East and 45º West.

It is 0º at the magnetic equator.

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

Depends on the true heading

Varies slowly over time.

Depends on the magnetic heading

Depends on the type of compass installed

4. What is the compass heading if true track is 348º, drift is 17º left, variation is 32º W, and deviation is 4ºE?

339º

033º

337º

009º

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

Compensating for deviation

Setting local magnetic variation

Synchronising the magnetic and gyro compass elements

Setting the 'heading' pointer.

6. Which of the following is an occasion for carrying out a compass swing on a direct reading compass?ng out a compass

After any of the aircraft ratio equipment has been changed due to unserviceability.

Before an aircraft goes on any flight that involves a large change of magnetic latitude

whenever an aircraft carries a large freight load regardless of its content.

After an aircraft has passed through a severe electrical storm, or has been struck by lightning.

7. Isogonic lines connect positions that have?

0° variation

The same variation.

The same elevation.

The same angle of magnetic dip.

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

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 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 with the same magnetic variation; the aclinic is the line of zero magnetic dip.

9. The purpose of compass check swing is to?

Cancel out the effects of the magnetic fields found on board the aeroplane.

Cancel out the horizontal component of the earth's magnetic field.

Cancel out the vertical component of the earth's magnetic field.

Measure the angle between Magnetic North and Compass North.

10. At the magnetic equator?

Dip is zero

Variation is zero.

Deviation is zero

The isogonal is an agonic line.

11. If variation is West?

True North Is East of Magnetic North

Compass North is West of Magnetic North

True North is West of Magnetic North

Magnetic North is West of compass North.

12. You are turning from 330°C to 040°C in the northern hemisphere. At the time that you stop the turn, but before the compass settles down, will the compass over-read or under -read (i), and will liquid swirl tend to increase or decrease the error (ii) ?

(i) Over-read (ii) Decrease

(i) Under-read (ii) Decrease

(i) Over-read (ii) Increase

(i) Under-read (ii) Increase

13. When an aircraft on a westerly heading on the northern hemisphere accelerates, the effect of the acceleration error causes the magnetic compass to ?

Turn faster than the actual turning rate of the aircraft.

Lag behind the turning rate of the aircraft

Indicate a turn towards the south

Indicate a turn towards the north.

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

45º

90º

180º

60º

15. An aircraft is accelerating in the Northern hemisphere heading West. Will a direct reading magnetic compass (1) over-read or under read and (2) Indicate a turn to the north or to the south?

(1) under-read (2) south

(1) under-read (2) north

(1) over-read (2) south

(1) over-read (2) north

16. The agonic line?

Is the shorter distance between the respective True and Magnetic North and South Poles.

Is midway between the magnetic North and South Poles.

Follows seperate paths out of the North polar regions, one currently running through Western Europe and the other through the USA

Follows the geographic equator

17. The main reason for usually mounting the detector unit of a remote indicating compass in the wingtip of an aeroplane is to?

Facilitate easy maintenance of the unit and increase its exposure to the Earth's magnetic field.

Place it in a position where there is no electrical wiring to cause deviation errors.

Place it where it will not be subjected to electrical or magnetic interference from the aircraft.

Reduce the amount of deviation caused by aircraft magnetism and electrical circuits

18. Sensitivity of a direct reading magnetic compass is?

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

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

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

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

19. The direct reading magnetic compass is made aperiodie (dead beat) by?

Pendulous suspension of the magnetic assembly

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

Using the lowest acceptable viscosity compass liquid.

Using long magnets

20. Concerning direct reading magnetic compasses, in the northern hemisphere, it can be said that?

On a Westerly heading, a longitudinal acceleration causes an apparent turn to the South.

On a Westerly heading, a longitudinal deceleration causes an apparent turn to the North.

On an Easterly heading, a longitudinal acceleration causes an apparent turn to the South.

On an Easterly heading, a longitudinal acceleration causes an apparent turn to the North.

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

True North is East of Magnetic North

Compass North is West of Magnetic North

Compass North is East of Magnetic North

True North is West of Magnetic North

22. Why does the value of magnetic variation on a chart changes with time?

Movement of the magnetic poles, causing an increase.

Increase in the magnetic field, causing an increase.

Movement of the magnetic poles, which can cause either an increase or a decrease.

Reduction in the magnetic field, causing a decrease

23. An Agonic line is a line that connects?

Positions that have the same variations

Points of equal magnetic horizontal field strength

Positions that have 0° variation.

Points of equal magnetic dip.

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

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

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

25. 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

155°T

160°T

26. The value of magnetic variation?

Cannot exceed 90º

Must be 0º at the magnetic equator.

Has a maximum of 180º

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

27. The agonic line?

Follows the geographical equator

Is midway between the 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.

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

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

On the geographical equator.

Close to the magnetic north pole.

Approximately misway between the magnetic poles.

Close to the magnetic South Pole.

29. Where do isogonal lines converge?

At the North and South Magnetic Poles.

A the North Magnetic Pole.

At the magnetic equator.

At the North and South Magnetic and Geographical Poles.

30. An aircraft is accelerating on a westerly heading in the northern hemisphere. Will the compass be over-reading or under-reading (i) and will it indicate a turn to the north or south (ii)?

(i) over-reading (ii) North turn.

(i) Under-reading (ii) North turn.

(i) over-reading (ii) South turn.

(i) Under-reading (ii) South turn.

31. At what point on the earth is a magnetic compass most effective?

Approximately midway between the magnetic poles.

Close to the magnetic North Pole.

Close to the magnetic South Pole.

At the geographic equator

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

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

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

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

Alignment error

Deviation

Variation

Dip

34. The main reason for mounting the detector unit of a remote reading compass in the wingtip of an aeroplane is?

To minimise the amount of deviation caused by aircraft magnetism and electrical circuits.

To ensure that the unit is in the most accessible position on the aircraft for ease of maintenance.

To maximise the units exposure to the earth's magnetic field.

By having detector units on both wingtips, to cancel out the deviation effects caused by the aircraft strucure

35. The sensitivity of a direct reading magnetic compass is?

Inversely proportional to the horizontal and vertical components of the earth's magnetic field.

Proportinal to the horizontal component of the earth's magnetic field.

Proportional to the vertical component of the earth's magnetic field.

Directly proportional to the horizontal and vertical components of the earth's magnetic field.

36. The magnitude of variation ?

Is zero at the equator.

Has a maximum value of 45°E or 45°W

Has a maximum of 90°

Has a maximum of 180°

37. 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.

More than 225

Less than 225

225

38. Complete the following statement regarding magnetic variation. The charted values of magnetic variation on earth normally change annually due to?

Magnetic pole movement causing numerical values at all locations to increase or decrease.

An increasing field strength causing numerical values at all locations to increase.

Magnetic pole movement causing numerical values at all locations to increase .

A reducing field strength causing numerical values at all locations to decrease.

39. 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.

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

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

40. Which of the following statements about the earth's magnetic field is most accurate?

The dip angle is the angle between the total magnetic field and the earth horizontal.

It may be permanent, temporary or transient.

It acts as if there were a large red magnetic pole in northern Canada

It has no effect on aircraft deviation.

41. 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?

208°

332°

031°

028°

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

It senses, rather than seeks, the magnetic meridian.

It requires less maintenance

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

It has less moving parts

43. Given: Magnetic heading 311°, Drift angle 10°left, Relative bearing of NDB 270°, What is the magnetic bearing of the NDB measured from the aircraft?

180°

211°

221°

208°

44. 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.

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

To isolate the detector unit from the aircraft deviation sources.

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

45. What are indicated by isogrivs on a chart?

Lines of zero magnetic variation

Lines of equal magnetic dip.

Lines of equal effective horizontal magnetic force.

Lines of equal grivation

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

The angle between the magnetic north and the true north.

The angle between the true north and the compass north.

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

The angle between the magnetic heading and the magnetic north

47. At the magnetic equator, when accelerating after take off on heading West, a direct reading compass?

Underreads

Overreads the heading

Indicates the correct heading

The heading indicates a turn to the south.

48. Isogrivs on a chart indicate lines of ?

Zero magnetic variation.

Equal horizontal directive force

Equal magnetic dip

Equal grivation

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

Anti-clockwise giving an apparent turn toward the north.

Clockwise giving an apparent turn toward the north.

Anti-clockwise giving an apparent turn toward the south.

Clockwise giving an apparent turn toward the south.

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

Using the lowest practicable viscosity compass liquid

Using long magnets.

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.

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