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.

Anti-clockwise giving an apparent turn toward the north.

Sensitivity of a direct reading magnetic compass is?

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

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

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

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

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

Over-Indicate the turn and liquid swirl 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

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

what is magnetic variation?

the angle between magnetic North and True North

the angle between Magnetic Heading and Magnetic North.

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

the angle between True North and Compass North.

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

More or less than 060ºdepending on the pendulous suspension used.

At the magnetic equator?

The isogonal is an agonic line.

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

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

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

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

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

The horizontal component of the earth's magnetic field?

Is approximately the same at magnetic latitudes 50º N and 50ºS.

Weakens with Increasing distance from the magnetic poles.

Weakens with Increasing distance from the nearer magnetic pole.

Is approximately the same at all magnetic latitudes less than 60º

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.

Compass North is West of Magnetic North.

DGCA Air Navigation: Earth Magnetism & The Compass Questions

185 exam-style Earth Magnetism & The Compass questions for the DGCA Air Navigation paper (CPL · ATPL · PPL). The first 12 are free below with answers and explanations — sign up free to practise all of them with progress tracking.

Q1
When accelerating on an easterly heading in the Northern hemisphere, the compass card of a direct reading magnetic compass will turn?
- A Anti-clockwise giving an apparent turn toward the south.
- B Clockwise giving an apparent turn toward the north.
- C Clockwise giving an apparent turn toward the south.
- D Anti-clockwise giving an apparent turn toward the north.
Show answer

Correct answer: B. Clockwise giving an apparent turn toward the north.

This Explanation is Coming Soon
Q2
Sensitivity of a direct reading magnetic compass is?
- A proportional to the vertical component of the magnetic field of the earth.
- B inversely proportlonal to the vertical and horizontal components of the magnetic field of the earth.
- C inversely proportional to horizontal component of the magnetic field of the earth.
- D proportional to horizontal component of the magnetic field of the earth.
Show answer

Correct answer: D. proportional to horizontal component of the magnetic field of the earth.

This Explanation is Coming Soon
Q3
When turning right from 320º(c) to 050º(C) In the Southern hemisphere, the reading of a direct reading magnetic compass will?
- A Over-Indicate the turn and liquid swirl decrease the effect.
- B Under-indicate the turn and liquid swirl will decrease the effect.
- C Over-indicate the turn and liquid swirl will increase the effect
- D Under-indicate the turn and liquid swirl will increase the effect.
Show answer

Correct answer: A. Over-Indicate the turn and liquid swirl decrease the effect.

This Explanation is Coming Soon
Q4
An aircraft is completing a timed turn in the Northern hemisphere from 330ºC to 040ºC. 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?
- A (1)over-read (2) increased
- B (1) over-read (2) decreased.
- C (1) under-read (2) increased
- D (1) under-read (2) decreased
Show answer

Correct answer: C. (1) under-read (2) increased

This Explanation is Coming Soon
Q5
what is magnetic variation?
- A the angle between magnetic North and True North
- B the angle between Magnetic Heading and Magnetic North.
- C the angle between the direction indicated on the compass and Magnetic North.
- D the angle between True North and Compass North.
Show answer

Correct answer: A. the angle between magnetic North and True North

This Explanation is Coming Soon
Q6
An aircraft in the northern hemisphere makes an accurate rate one turn to the right/starboard. If the initial heading was 330º, after 30 seconds of the turn the direct reading magnetic compass should read?
- A 060º
- B More than 060º
- C More or less than 060ºdepending on the pendulous suspension used.
- D Less than 060º
Show answer

Correct answer: D. Less than 060º

This Explanation is Coming Soon
Q7
At the magnetic equator?
- A Deviation is zero
- B The isogonal is an agonic line.
- C Dip is zero
- D Variation is zero.
Show answer

Correct answer: C. Dip is zero

This Explanation is Coming Soon
Q8
Which of the following is the correct conversion from True to Compass?
- A True north 130, Variation 2W Magnetic 128 Deviation -1 , Compass127
- B True north 130, Variation 2E, Magnetic 128 ,Deviation -1 , Compass 127
- C True north 130, Variation 2E, Magnetic 132, Deviation -1, Compass 133
- D True north 130, Variation 2w, Magnetic 132, Deviation -1, Compass 133
Show answer

Correct answer: D. True north 130, Variation 2w, Magnetic 132, Deviation -1, Compass 133

This Explanation is Coming Soon
Q9
The horizontal component of the earth's magnetic field?
- A Weakens with Increasing distance from the magnetic poles.
- B Weakens with Increasing distance from the nearer magnetic pole.
- C Is approximately the same at all magnetic latitudes less than 60º
- D Is approximately the same at magnetic latitudes 50º N and 50ºS.
Show answer

Correct answer: D. Is approximately the same at magnetic latitudes 50º N and 50ºS.

This Explanation is Coming Soon
Q10
What is the maximum value of dip that can be caused by the vertical component of terrestrial magnetism?
- A 45º
- B 60º
- C 90º
- D 180º
Show answer

Correct answer: C. 90º

This Explanation is Coming Soon
Q11
Which of the following is correct when the variation is West?
- A True North is East of Magnetic North.
- B Magnetic North is West of Compass North
- C True North is West of Magnetic North.
- D Compass North is West of Magnetic North.
Show answer

Correct answer: A. True North is East of Magnetic North.

This Explanation is Coming Soon
Q12
A line drawn on a chart which joins all points where the value of magnetic variation is zero is called an?
- A Agonic line
- B Aclinic line.
- C Isogonal
- D Isotach
Show answer

Correct answer: A. Agonic line

This Explanation is Coming Soon

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