What is tachometer? All Questions › Category: Control System › What is tachometer? 0 Vote Up Vote Down DEEPAKSA RAIBHAGI asked 4 years ago 1 Answers 0 Vote Up Vote Down Chetan Shidling Staff answered 4 years ago The tachometer is a speed transducer. Used as a feedback element in the control system. It is used to measure the speed of motors.