Which of the following makes the existence of ionosphere possible? - Avionics MCQ

Aeronautical & Aerospace Engineering : Avionics - Quiz(MCQ)

Which of the following makes the existence of ionosphere possible?

A)

Solar flares

B)

Rotation of the Earth

C)

Radiation from distant stars

D)

Ultraviolet radiation from sun

Correct Answer : Ultraviolet radiation from sun

Explanation : The ionosphere owes its existence to the ultraviolet radiation from the sun. The photons possess a certain amount of energy which is enough to break down electrons from their parent atom. The result is a large number of free, negatively charged, electrons and positively charged atoms and molecules called ions.

Recently Updated in Avionics Questions

Why is the gyro and accelerometers shock mounted to the body?

A)

Reduce drift error

B)

Impact protection

C)

Limit vibration errors

D)

Prevent voltage surges

Correct Answer : Option (C) : Limit vibration errors

Explanation : The gyros and accelerometers are rigidly mounted on a block with temperature sensors. The block is usually shock mounted to the vehicle to control the bandwidth of the motion sensed at the instruments. Shock mounting limits vibration rectification errors within the errors themselves.

Pre-processing algorithms are also called as ________

A)

Resolution algorithm

B)

Coning algorithm

C)

Differential algorithm

D)

Error control algorithm

Correct Answer : Option (B) : Coning algorithm

Explanation : Pre-processing the gyro data at a higher rate than the quaternion iteration improves the approximation in the vector change in angle in order to follow the actual motion of the rotation axis closely. The pre-processing algorithm is also called as coning algorithms.

Which of the following is false with respect to gimballed platform?

A)

Protect the instruments from large angular motion

B)

Euler angles are not easily readable from the gimbals

C)

Protection from vibration, temperature and magnetic effects

D)

Orients the accelerometers into a coordinate frame relative to Earth

Correct Answer : Option (B) : Euler angles are not easily readable from the gimbals

Explanation : One of the main purposes of gimballed system is to provide a convenient readout of vehicle attitude by reading each of the gimbals angles separately, thereby yielding convenient Euler angle outputs.

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