Vayudoot Aviation

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

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

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

2. What is the angle between True North and Magnetic North?

Dip

Drift

Variation

Deviation.

3. The Earth can be considered as being a magnet with the ?

Blue pole near the north pole of the earth and the direction of the magnetic force pointing straight down to the earth's surface.

Red pole near the north pole of the earth and the direction of the magnetic force pointing straight up from the earth's surface.

Red pole near the north pole of the earth and the direction of the magnetic force pointing straight down to the earth's surface.

Blue pole near the north pole of the earth and the direction of the magnetic force pointing straight up from the earth's surface.

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

It cannot exceed 90º

It is 0º at the magnetic equator.

It varies between 45º East and 45º West.

It cannot exceed 180º

5. An aircraft in the northern hemisphere is making an accurate rate one turn to the right. If the initial heading was 135º, after 30 seconds the direct reading magnetic compass should read?

More or Less than 225º depending on the pendulous suspension used.

225º

More than 225º

Less than 225º

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

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

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

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

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

7. The value of magnetic variation?

Has a maximum of 180º

Cannot exceed 90º

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

Must be 0º at the magnetic equator.

8. 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.

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

Varies slowly over time.

Depends on the type of compass installed

Depends on the magnetic heading

Depends on the true heading

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

Magnetic North is West of Compass North

True North is West of Magnetic North.

Compass North is West of Magnetic North.

True North is East of Magnetic North.

11. An aircraft using a direct reading magnetic compass in the Northern hemisphere starts a Rate 1 turn to the right from 145°C. What will be the Indicated heading if it rolls out of the turn after 30 seconds?

Greater than 235°

It is not possible to answer this question using the information given.

235°

Less than 235°

12. What will be the effect on its direct reading compass when an aircraft on the Equator accelerates whilst traveling westwards?

Indicates an increase an increase in heading.

Indicates a decrease in heading

No change

Indicates an apparent turn to the North.

13. 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.

14. 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 subjected to hammering.

Every maintenance inspection.

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

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

45º

90º

60º

180º

16. When turning right from 320º(c) to 050º(C) In the Southern hemisphere, the reading of a direct reading magnetic compass will?

Under-indicate the turn and liquid swirl will decrease the effect.

Over-Indicate the turn and liquid swirl decrease the effect.

Under-indicate the turn and liquid swirl will increase the effect.

Over-indicate the turn and liquid swirl will increase the effect

17. 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.

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

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

18. Why does the value of magnetic variation on a chart change with time?

Movements of the magnetic poles, cause it to increase

Movements of the magnetic poles, cause it to increase or decrease.

Reductions in the magnetic field, cause it to decrease.

Increases in the magnetic field, cause it to increase

19. 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?

031°

208°

028°

332°

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

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

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

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

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

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

339º

009º

337º

033º

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

45°

66°

90°

180°

23. At the magnetic equator?

Deviation is zero

Variation is zero.

Dip is Zero

The agonic line is also an isogonal line.

24. Permanent magnetism in aircraft arises chiefly from?

Exposure to the earth's magnetic field during normal operation.

The effect of internal wiring and exposure to electrical storms.

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

The combined effect of aircraft electrical equipment and the earth's magnetic field.

25. A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an?

Aclinic line.

Isogonal

Isotach

Agonic line

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

Isogonals

Isoclines

Isogrives

Isotachs

27. A direct reading compass should be swung when?

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

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

There is a large change in magnetic longitude.

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

28. Isogrivs on a chart indicate lines of ?

Equal horizontal directive force

Equal grivation

Zero magnetic variation.

Equal magnetic dip

29. A ground feature appears 30° to the left of the centre line of the CRT of an airborne weather radar. If the heading of the aircraft is 355° (M) and the magnetic variation is 15° East, the true bearing of the aircraft from the feature is?

310°

130°

160°

220°

30. Compass deviation is defined as the angle between?

Magnetic North and Compass North

True North and Compass North

The horizontal and the total intensity of the earth's magnetic field

True North and Magnetic North

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

A freely suspended compass needle will stand vertical.

Isogonals converge.

The value of magnetic variation equals 90°

A freely suspended compass needle will stand horizontal.

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

Close to the magnetic South Pole.

At the geographic equator

Approximately midway between the magnetic poles.

Close to the magnetic North Pole.

33. 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 North

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.

34. The agonic line?

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

Follows the geographic equator

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

Is midway between the magnetic North and South Poles.

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

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

It has no effect on aircraft deviation.

It may be permanent, temporary or transient.

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

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

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

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.

37. The sensitivity of a direct reading compass varies?

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.

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

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

The angle between the magnetic heading and the magnetic north

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

The angle between the true north and the compass north.

The angle between the magnetic north and the true north.

39. When accelerating on a westerly heading in the northern hemisphere, the compass card of a direct reading magnetic compass will turn?

Clockwise giving an apparent turn towards the south

Clockwise giving an apparent turn towards the north.

Anti-clockwise giving an apparent turn towards the south

Anti-clockwise giving an apparent turn towards the north.

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

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

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

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

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

41. what is magnetic variation?

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

the angle between True North and Compass North.

the angle between Magnetic Heading and Magnetic North.

the angle between magnetic North and True North

42. 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 is lighter

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

43. Isogonic lines connect positions that have?

The same elevation.

0° variation

The same variation.

The same angle of magnetic dip.

44. The angle between Magnetic north and compass north is called?

alignment error

compass deviation

magnetic variation

compass error

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

Compass North is East of Magnetic North

True North is West of Magnetic North

True North is East of Magnetic North

Compass North is West of Magnetic North

46. Sensitivity of a direct reading magnetic compass is?

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.

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

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

47. 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.

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

The use of repeater cards.

Positioning the master unit in the centre of the aircraft.

Mounting the detector unit in the wingtip.

Using a vertically mounted gyroscope.

49. 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

50. Where do the isogonal lines converge?

At the both the North and South Geographic Poles.

Only at the Magnetic North Pole.

Only at the Magnetic equator

At both the North and South Magnetic Poles.

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