Vayudoot Aviation

1. 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.

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

remote reading compass.

a standby compass.

direct reading compass.

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

Exposure to the terrestrial magnetic field during normal operation.

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.

4. Isogonals converge at the?

North and South geographic and magnetic poles.

Magnetic equator.

North magnetic pole only.

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

True North is West of Magnetic North.

True North is East of Magnetic North.

Magnetic North is West of Compass North.

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

A heading of East.

A decrease in heading.

An apparent turn to the South.

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

the aircraft decelerates on 270° (C).

the aircraft accelerates on 090° (C).

the aircraft accelerates on 000° (C).

8. 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) over-read (2) increased.

(1) under-read (2) increased.

(1) over-read (2) decreased.

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

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.

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

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

Mounting the detector unit in the wingtip.

Positioning the master unit in the center of the aircraft.

Using a vertically mounted gyroscope.

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

Depends on the true heading.

Varies slowly over time.

Depends on the magnetic heading.

12. When turning right from 320° (C) to 050° (C) in the Southern hemisphere, the reading of a direct reading magnetic compass will?

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

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

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

13. 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.

14. 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?

130°.

310°.

160°.

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

90°.

00°.

180°.

16. 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 may be permanent, temporary, transient.

It does not affect aircraft deviation.

17. 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 acceleration causes an apparent turn to the South.

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

18. 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.

19. 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.

20. 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 distance from the magnetic equator is too long.

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

21. The magnitude or variation?

has a maximum of 90°.

has a maximum value of 45° E or 45°W.

has a maximum of 180°.

22. 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 = 33.3 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 = 43.3 MT ]

23. Select the correct statement

DRC with all 3 property can be used any where.

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

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

24. 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.

Anti-clockwise giving an apparent turn towards the north.

Clockwise giving an apparent turn toward the south.

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

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

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

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

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

Using the lower possible viscosity liquid in the compass.

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

Using a pendulous suspension system for the magnetic assembly.

27. At the magnetic equator?

Dip is zero.

Deviation is zero

Variation is zero.

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

130 2W 128 -1 127.

130 2E 132 -1 133.

130 2E 128 -1 129.

29. Disadvantage of Remote sensing compass over DRC is

Susceptible to electrical failure.

Detector unit is exposed to high deviation errors.

Turning errors are increased.

30. 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.

31. The agonic line?

Is midway between the magnetic north and South Poles.

Jowis places of nil variation.

Follows the geographical equator.

32. 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.

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

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

33. The purpose of compass check swing is to?

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.

Measure the angle between Magnetic North and Compass North.

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

60°.

90°.

45°.

35. Compass deviation is caused by

the angle of inclination.

the angle of magnetic dip.

aircraft magnetism distorting the earths magnetic field.

36.
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) 19/40 ]

- [(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 ]

37. 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 south.

38. 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°.

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. The sensitivity of a direct reading compass varies?

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

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

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

41. An aircraft's compass must be swung?

If the aircraft has been subjected to hammering.

Every maintenance inspection.

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

42. 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?

Greater than 235°.

Less than 235°

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

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

the total magnetic field in the compass location.

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

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

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

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

Increases in the magnetic field, cause it to increase.

Movements of the magnetic poles, cause it to increase.

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

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 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 the earth's surface.

46. 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.

47. 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) south

(1) over-read (2) north

(1) under-read (2) north

48. 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.

49. 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 place with the same magnetic field strength.

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

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

50. 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°.

More than 225°.

225°.

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