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Which one of the following is false with respect to electromechanical instruments?

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Which one of the following is false with respect to electromechanical instruments?

(a) High cost

(b) Require skilled labor for repair

(c) Accurate measurements

(d) Inevitable wear

The question was asked during an online interview.

This question is from Head Down Display Technology in portion Displays and Man-Machine Interaction of Avionics

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Correct option is (c) Accurate measurements

Easy explanation: Although electromechanical instruments have been used for a long period of time, the cost of ownership of such instrument is high. These also depend on very low friction precision mechanisms which require skilled labor for repair. Since they have rotating components in them they have inevitable wear and deterioration in the spin axis bearing system. Due to this, their measurements may not be accurate with time.

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