ME 360 Midterm: ME 360 Alabama Test3 Fall02
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Short answer questions - use the space provided for written answers: true/false questions (1 pt each) ______a) placing a smaller resistance across the leads of a dynamometer"s generator increases the load (torque) on the motor. ______b) absolute encoders are usually more expensive than incremental encoders since they require more wires and optical sensors to operate. ______c) total uncertainty is found by adding the precision and bias uncertaintires. ______d) the length of an lvdt is normally about 3 times the linear measurement range. ______e) timer based methods always give an instantaneous value for measured velocity. ______f) piezoresistive accelerometers can measure a constant (or dc) acceleration. ______g) the gage factor for foil strain gages is typically in the range of 2. 0 to 2. 2. ______h) accelerometers are frequently used to measure high frequency vibrations ( > 1000 hz). ______i) a readout device should have a low input impedance to measure a potentiometer-type sensor.
