Why does magvar have diurnal change?

Static buildup error

Sensitivity of the instruments

Magnetic pole migration

Variation in aircraft magnetic effects

Correct Answer : Magnetic pole migration

Explanation : Magvar has a diurnal change, a long term change due to the migration of magnetic poles, and random changes because of magnetic storms. The magnitude of the magnetic field changes about 0.5% per year.

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The error that occurs due to the rotation of Earth as well as the aircraft�s own motion is called as ______

Asymmetrical error

Precession rate error

Rate compensation error

Standoff constant error

Correct Answer : Option (D) : Standoff constant error

Explanation : A stand off constant error exists since the direction of the local vertical changes as a result of both the rotation of the Earth and the aircraft’s own motion around the Earth.

What can be done to reduce to avoid poor acceleration error averaging?

Use higher order leveling loop

Use switch gravity sensors

Use differential leveling loop

Use lowest order leveling loop

Correct Answer : Option (A) : Use higher order leveling loop

Explanation : The stand off error depends upon the gravity sensors switch’s dead and gives poor acceleration errors. Significant improvement can be obtained in the averaging vertical reference by using a high order leveling loop.

Which of the following is not a unit of the magnetic field?

Maxwell

Tesla

Gauss

Gamma

Correct Answer : Option (A) : Maxwell

Explanation : The magnetic fields B are measured in Gauss and Tesla(10⁴ Gauss). In geomagnetism, Units of “Gamma”(10^-5 )are used.