Vayudoot Aviation

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

Anti-clockwise giving an apparent turn towards the north.

Clockwise giving an apparent turn towards the south.

Clockwise giving an apparent turn towards the north.

2. Disadvantage of Remote sensing compass over DRC is

Detector unit is exposed to high deviation errors.

Susceptible to electrical failure.

Turning errors are increased.

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 up the earth's surface.

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 down to the earth's surface.

4. Which of the following is the correct conversion from True to Compass? T V M D C

130 2E 132 -1 133.

130 2W 128 -1 127.

130 2E 128 -1 129.

5. The sensitivity of a direct reading compass varies?

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

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

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

6. 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.

Anti-clockwise giving an apparent turn toward the south.

Clockwise giving an apparent turn toward the South.

7. Which of the following statements is correct concerning the effect of turning errors on a direct reading compass?

Turning errors are greatest on east/west headings, and are greatest at high latitudes.

Turning errors are greatest on north/south headings, and are greatest at high latitudes.

Turning errors are greatest on north/south headings, and are least at high latitudes.

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

At the geographic equator.

Close to the magnetic North Pole.

Approximately midway between the magnetic poles.

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

A decrease in heading.

An apparent turn to the South.

A heading of East.

10. In the areas close to the magnetic poles compasses are not to any use in air navigation, mainly because

the inclination is insufficient in these areas.

the horizontal component of the earths magnetic field is too weak.

the distance from the magnetic equator is too long.

11. When decelerating on a westerly heading in the Northern hemisphere, the compass card of a direct reading magnetic compass will turn?

Anti-clockwise giving an apparent turn towards the south.

Clockwise giving an apparent turn toward the south.

Anti-clockwise giving an apparent turn towards the north.

12. At the magnetic equator?

Deviation is zero

Dip is zero.

Variation is zero.

13. An aircraft is completing a timed turn in the Northern hemisphere from 330°C to 040°C. After the turn has been stopped but before the direct indicating magnetic compass settles down, will the compass (1) over-read or under-read. and (2) is this error increased or decreased by liquid swirl?

(1) under-read (2) increased.

(1) over-read (2) increased.

(1) over-read (2) decreased.

14. A magnetic compass will show an apparent turn to the north in the southern hemisphere when

the aircraft accelerates on 000° (C).

the aircraft accelerates on 090° (C).

the aircraft decelerates on 270° (C).

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

More than 225°.

225°.

Less than 225°.

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

A freely suspended compass needle will stand vertical.

A freely suspended compass needle will stand horizontal.

The value of magnetic variation equals 90°.

17. Isogonals converge at the?

North magnetic pole only.

North and South geographic and magnetic poles.

Magnetic equator.

18. An aircraft's compass must be swung?

If the aircraft has been subjected to hammering.

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

Every maintenance inspection.

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

Agonic line.

Aclinic line.

Isogonal.

20. At the magnetic equator?

The isogonal is an agonic line.

Dip is Zero.

Deviation is Zero.

21. An aircraft in the northern hemisphere makes an accurate rate one turn to the right/starboard. If the initial heading was 330°, after 30 seconds of the turn the direct reading magnetic compass should read?

Less than 060°.

More or less than 060° depending on the pendulous suspension used.

More than 060°.

22. 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) over-read (2) north

(1) under-read (2) north

(1) over-read (2) south

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

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

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

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

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

Indicates the correct heading.

Under reads.

The heading indicates a turn to the south.

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

An isogonal.

An isogriv.

An isoclinic.

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

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

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

Exposure to the terrestrial magnetic field during normal operation.

27. Which of the following is an occasion for carrying out a compass swing on a Direct Reading Compass?

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

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

After any of the aircraft radio equipment has been changed due to un serviceability.

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

45°.

60°.

90°.

29. 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.

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.

30. The magnitude or variation?

has a maximum of 90°.

has a maximum of 180°.

has a maximum value of 45° E or 45°W.

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

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

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

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

Magnetic North is West of Compass North.

True North is East of Magnetic North.

True North is West of Magnetic North.

33. At a specific location the value of magnetic variation?

Depends on the magnetic heading.

Depends on the true heading.

Varies slowly over time.

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

Indicates a decrease in heading.

No change.

Indicates a increase in heading.

35. The magnetic north pole seems to rotate around the geographical north pole. A complete rotation takes about

1 degree each 2.67 year.

3.37 years.

1 degree each 5.9 year.

36. Deviation applied to magnetic heading gives?

Magnetic track

Magnetic course.

Compass heading

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

Weakens with increasing distance from the magnetic poles.

Is approximately the same at magnetic latitude 50°N and 50°S.

Weakens with increasing distance from the nearer magnetic poles.

38. Compass deviation is caused by

aircraft magnetism distorting the earths magnetic field.

the angle of magnetic dip.

the angle of inclination.

39. 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 senses, rather than seeks, the magnetic meridian.

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

40. What is the dip angle at the South Magnetic Pole?

90°.

00°.

180°.

41. Select the correct statement

Whatever be the efforts made for accuracy, DRC is unreliable beyond 70° N / 70°

Whatever be the accuracy DRC can not be used beyond 70°N.

DRC with all 3 property can be used any where.

42. 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 of an Easterly heading causes an apparent turn to the North.

A longitudinal deceleration of a Westerly heading causes an apparent turn to the North

43. A ground feature appears 30° to the left on the center 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?

160°.

310°.

130°.

44. In direct reading magnetic compass, the effect of dip is countered by

low center of gravity.

powerful magnets

the shape of the casing.

45. A direct reading compass should be swung when?

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

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

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

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

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

Using the lower possible viscosity liquid in the compass.

Using a pendulous suspension system for the magnetic assembly.

47. Magnets in DRC are suspended below to

To make DRC aperiodic

Improve sensitivity

Improve horizontality

48. Given that T = 50 micro-tesla (m T), dip angle = 60, calculate H and Z

- [H = T X COS DIP, THEREFORE, IN THIS CASE H = 50 X COS 60, H = 25 MT, AND, Z = H X TAN DIP, THEREFORE, IN THIS CASE Z = 25 Z TAN 60, Z = 25 X 1.732 = 43.3 MT ]

- [H = T X COS DIP, THEREFORE, IN THIS CASE H = 50 X COS 60, H = 25 MT, AND, Z = H X TAN DIP, THEREFORE, IN THIS CASE Z = 25 Z TAN 60, Z = 25 X 1.732 = 33.3 MT ]

49. The forces acting upon the compass needle in a stand-by compass in an aircraft, are

the earths magnetic field, the aircraft magnetic field and the effects of attitude and movement of the aircraft.

the total magnetic field in the compass location.

the earths magnetic field, the Coriolis effect and aircraft magnetism.

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

Using a vertically mounted gyroscope.

Positioning the master unit in the center of the aircraft.

Mounting the detector unit in the wingtip.

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