Question

What is the output given by an accelerometer if the instrument is accelerated upward with an acceleration of 7g?

(a) 5g

(b) 8g

(c) 6g

(d) 6.5g

The question was posed to me in unit test.

This intriguing question comes from Accelerometer in section Satellite Radio Navigation  & Inertial Navigation of Avionics

Answer 1

Right answer is (b) 8g

Easy explanation: Accelerometer is used to measure acceleration of the vehicle and thus must be corrected for the Earth’s gravitational effect. If the accelerometer is being accelerated upward with an acceleration of 7g, then (a-G) = 7g – (-1g), and the instrument reads 8g.