____ control systems were used before electronics.
A) Pneumatic
B) Manual
C) Digital
D) Mechanical

Question

Quizplus · Accepted Answer

Before electronics, control systems were commonly operated using either pneumatic or mechanical means. Pneumatic systems use compressed air or gas to control motion or pressure, while mechanical systems rely on physical components such as levers and gears. Therefore, the best choices are A) Pneumatic and D) Mechanical.

____ Control Systems Were Used Before Electronics