Vayudoot Aviation

1. The type of compass least likely to suffer from parallax is

a standby compass.

remote reading compass.

direct reading compass.

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

Less than 235°

Greater than 235°.

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

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

the total magnetic field in the compass location.

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

A freely suspended compass needle will stand horizontal.

The value of magnetic variation equals 90°.

A freely suspended compass needle will stand vertical.

5. 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.

6. Magnets in DRC are suspended below to

To make DRC aperiodic

Improve sensitivity

Improve horizontality

7. 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 aircraft deviation sources.

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

8. The purpose of compass check swing is to?

Measure the angle between Magnetic North and Compass North.

Cancel out the effects of the magnetic field found on board the aero plane.

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

9.
Magnetic dip 40°, H value = 23 unit, value of Z and T will be

- [(A) TANΘ = Z/H Z/23 = TAN40° Z = 19 XOA 40 = H/T T= 23/COS 40 = 30 A) 30/19 B) 18/24 C) 19/30 ]

- [(A) TANΘ = Z/H Z/23 = TAN40° Z = 19 XOA 40 = H/T T= 23/COS 40 = 30 A) 30/19 B) 18/24 C) 19/40 ]

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

00°.

180°.

90°.

11. 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

12. 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) north

(1) over-read (2) south

(1) over-read (2) north

13. 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.

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

Indicates a increase in heading.

No change.

Indicates a decrease in heading.

15. 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.

16. 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 deceleration of a Westerly heading causes an apparent turn to the North

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

17. 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?

More than 060°.

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

Less than 060°.

18. An aircraft's compass must be swung?

Every maintenance inspection.

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

If the aircraft has been subjected to hammering.

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

Agonic line.

Isogonal.

Aclinic line.

20. Compass deviation is caused by

aircraft magnetism distorting the earths magnetic field.

the angle of inclination.

the angle of magnetic dip.

21. The magnitude or variation?

has a maximum of 180°.

has a maximum value of 45° E or 45°W.

has a maximum of 90°.

22. Disadvantage of Remote sensing compass over DRC is

Susceptible to electrical failure.

Detector unit is exposed to high deviation errors.

Turning errors are increased.

23. 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?

310°.

160°.

130°.

24. 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.

Mounting the detector unit in the wingtip.

Positioning the master unit in the center of the aircraft.

25. 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.

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

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

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

Clockwise giving an apparent turn toward the south.

Anti-clockwise giving an apparent turn towards the south.

Anti-clockwise giving an apparent turn towards the north.

27. The sensitivity of a direct reading compass varies?

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

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

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

28. 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.

29. 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.

Increases in the magnetic field, cause it to increase.

30. 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.

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

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

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

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

32. Deviation applied to magnetic heading gives?

Compass heading

Magnetic course.

Magnetic track

33. At the magnetic equator?

Dip is zero.

Variation is zero.

Deviation is zero

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

Approximately midway between the magnetic poles.

Close to the magnetic North Pole.

At the geographic equator.

35. When turning right from 320° (C) to 050° (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 will increase the effect.

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

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

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

the distance from the magnetic equator is too long.

the inclination is insufficient in these areas.

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

Indicates the correct heading.

The heading indicates a turn to the south.

Under reads.

38. Which of the following statements is true of the Earth's magnetic field?

It acts like a large blue magnetic pole in Northern Canada.

It does not affect aircraft deviation.

It may be permanent, temporary, transient.

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

3.37 years.

1 degree each 2.67 year.

1 degree each 5.9 year.

40. 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?

Less than 225°.

225°.

More than 225°.

41. At the magnetic equator?

The isogonal is an agonic line.

Dip is Zero.

Deviation is Zero.

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

130 2E 128 -1 129.

130 2E 132 -1 133.

130 2W 128 -1 127.

43. 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 ]

44. Select the correct statement

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

DRC with all 3 property can be used any where.

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

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

True North is East of Magnetic North.

Magnetic North is West of Compass North.

True North is West of Magnetic North.

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

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.

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

47. 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 north.

Anti-clockwise giving an apparent turn towards the north.

Clockwise giving an apparent turn towards the south.

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

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

Magnetic North rotates around true North showly.

Earth's Red Pole is situated in North Canada.

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

the aircraft accelerates on 090° (C).

the aircraft decelerates on 270° (C).

the aircraft accelerates on 000° (C).

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

Varies slowly over time.

Depends on the true heading.

Depends on the magnetic heading.

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