ME 360 Midterm: ME 360 Alabama Test2 Fall09
Document Summary
10/30/09: [5] the setup below is used to measure angular velocity of a shaft. In a 1. 00 second period, a total of 325 pulses are counted. 0 1 2 3 4 5 6 7 8 9 322 323 324 325. Placing a larger resistance across the leads of a dynamometer"s generator increases the load (torque) on the dynamometer"s motor. The synchronous speed of an ac motor depends on input frequency and the number of poles. An lvdt uses two coils of wire and ac signals to measure displacement of a ferrous core. Piezoresistive accelerometers work by converting the force applied to a known mass (a=f/m) into a resistance change measured by a wheatstone bridge. Pwm stands for pulse-width-modulation - a way to measure the speed of an electric motor. Over: [5 pt] a sensor is taken from a bucket of boiling water and dropped into a bucket of ice water.
