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What is the operating voltage of Solid-state integrated standby instrument?

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What is the operating voltage of Solid-state integrated standby instrument?

(a) 11V DC

(b) 28V DC

(c) 5V DC

(d) 115V DC

This question was addressed to me in an interview for job.

My doubt stems from Head Down Display Technology in section Displays and Man-Machine Interaction of Avionics

1 Answer

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Best answer
Right option is (b) 28V DC

Easiest explanation: The Solid-state integrated standby instrument operates from the 28V DC supply produced by the emergency batteries. The integral power conditioning electronics are designed to cope with the variations in the battery supply voltage.

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