120 final sheet

3. Sensing principle used in a LVDT _ELECTROMAGNETISM_4. The _PHOTOELECTRIC__ is a phenomenon in which photon energy (i.e. from light) releases electrons from their otherwise more stable state on a surface5. A _QUATER BRIGE_ uses a single strain gage with three fixed resistors 6. Temperature-dependent resistance is the sensing principle used in_THERMISTER_7. SPL is a measurement of sound strength on a _dB_Logrithmic_8. A _________ is a common device for quantifying fluid velocity based on stagnation pressure9. 8-bit binary representation of 121 is__0111_ 1001____10. A photoelectric tachometer has 24 equally spaced reflectors on the disk. If 600 cycles per second are detected the rpm of the shaft is ________________________________________________________1. Under-sampling results in __ALIASING__2. ___UNCERTAINTY__ is an estimate of the magnitude of error, typically expressed in terms of a confidence interval within which the error lies.3. __NORMAL__ distribution best describes the dispersion of data in which the measurement variations are completely due to random factors and occurrences in both positive and negative deviations are equally probable4. __BANDWIDTH___ is frequency range in which gain is relatively constant5. ___LOW PASS______ filter attenuates high frequencies6. Main advantage of FFT is __IS RAPID____7. “Static signals are those for which changes over time are negligible for the intended measurement” True 8. Any two examples of dynamic signals are _VIBR.Ns_and _ACOUSTICS__9. Linear regression fits a straight line Y = ax + b through data, using the method of _LEAST SQUAREs_ PAGE15510 . The closer cofft. Of determination r² is to 1, the better the fit:TRUE

CALC PROBs__________________________________1. A 1 kHz sine wave is sampled at 1.5 kHz. What is the expected alias frequency PAGE 99 DISCRETE SAMPLING

2. The results of a test that follows a normal distribution have a mean value of 10.0 and a standard deviation of 1. Find the probability that a single reading is between 9 and 12 EXAMPLE 6.9 PAGE 135

3. What are the common parameters used to describe the CentralTendency of a data set (6 points) 6.2.2 PAGE122 MODE, MEAN, MEDIAN

4. Nine voltage measurements in a circuit have produced the followingvalues: 12.02, 12.05, 11.96, 11.99, 12.10, 12.03, 12.00, 11.95, 12.16. If the standard deviation for the above data set is 0.07V, determine whether any values can be rejected. (14 points)AVG: 12.0289 so: 11.95 n 12.16 r out!

5. Based on 36 samples, the average resistance is 25 ohms and the sample standard deviation is 0.5 ohm. Determine the 90% confidence interval of the mean resistance of the batch. (15 points)

6. To calculate the power consumption in a resistive circuit (P = VI), the voltage and current have been measured and found to be V = 100 +/- 2V , I = 10 +/- 0.2Av Calculate the maximum possible error and also the best-estimate uncertainty in the computation of the power. Assume that the confidence levels for the uncertainties in V and I are the same. (20 points)EXAMPLE 7.1 PAGE182

7. Explain the concept of Signal Attenuation with an examplePAGE48