MET 310 Sensors, Transducers and Actuators Resit 2023

About this paper

MET 310: A 2-page Second Semester Resit Exam for Sensors, Transducers & Actuators (MET310), University of Buea College of Technology, Department of Mechanical Engineering, instructor Dr Tsapla, dated June 13th 2023, Academic Year 2022/2023, 04 credits, 2 hours, Venue G104. Three exercises: (1) a force sensor whose resistance varies linearly from 1 M-ohm to 1 k-ohm over a 1 gf to 1000 gf range, driven by a 10 mA constant-current source and read by a voltmeter of 10 M-ohm internal impedance, requiring the loading error and actual readings across the force range; (2) impedance matching of a voice-coil actuator driven by a 12 V amplifier with 4-ohm internal impedance, covering matched-load power, a proof that mismatched loads deliver less power, and the power delivered to a fixed 4-ohm actuator from a lower-impedance (0.5-ohm) source; (3) loading effects of adding a second identical 8-ohm loudspeaker in parallel to a matched 8-ohm amplifier output, showing the drop in delivered power and solving for the speaker impedance needed to restore the original maximum power.