6. The default plot created by Excel meets all of the requirements for a formal report plot in ME 360.
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1 ME 360 Fall 2008 Semester Test #1 9/24/08 Closed book, closed notes portion of test. When you turn in this part of the test you will get the second part which allows a page of handwritten formulas. There are 30 points on the 1 st part and 70 on the 2 nd part. True/False Questions (1 point each) 1. The gain for an ideal voltage follower is Aliasing occurs when a waveform is sampled at less than twice the waveform s frequency. 3. The resolution of a 05V, 8 bit ADC is ±4.9 mv. 4. Low input impedance is desirable in measuring devices, since they will then draw very little current from the measured system. 5. There are four kinds of uncertainty in ME 360: bias, precision, calculated and centered. 6. The default plot created by Excel meets all of the requirements for a formal report plot in ME The main two screens in a LabView program are the block diagram and the front panel. 8. The resolution of a ±5V, 10 bit ADC is ±4.9 mv. 9. A 100 Hz, ±6 volt (12 V peaktopeak) sine wave (E i ) is applied to two different amplifier circuits. Sketch the output waveform (E 0 ) for each of these amplifiers in the scope screens below. 20k 30k 47k 47k E i 12V 12k 12V E o E i 22k 12V 12V E o Over
2 10. What are the two types of information that should always be provided in the Background section of an ME 360 lab report? 11. a. An ME professor weighs 235 lbf. What is this professor s mass in both lbm and kg? b. A 1996 Ford Ranger has an engine of 2300 cm 3 displacement. How many cubic inches (in 3 ) is this engine displacement? 12. Write the computed uncertainty formula for the following equation using the simplified method. Assume that every parameter in the equation has uncertainty. 4 d G 3 8D N m Over
3 ME 360 Fall 2008 Semester Test #1 9/24/08 Closed book, closed notes, one 8.5x11 inch handwritten formula sheet allowed. Work the problem in the space provided below each problem. 6a. Nine measurements of weight (in lb) are listed in the table to the right. Three statistical tables are reproduced on the next page. Determine the precision uncertainty for the mean at a 95% confidence level using all applicable rules for statistical data analysis b. The manufacturer of the scale used to measure the weights above lists the accuracy of the instrument as: accuracy = ± ( 1.2% of reading 2 digits) Determine the bias uncertainty in lb for the mean weight. 6c. What is the combined uncertainty in lb for the mean value for the weight?
4
5 7. Two resistors are measured with a Fluke 75 DMM. The nominal readings for the resistors are R 1 = k and R 2 = 76.3 k. Calculate the parallel resistance of the two resistors, R P. Calculate the uncertainty in the parallel resistance. Data for the Fluke 75 DMM is listed in the table below. Fluke 75 Digital Multimeter Function Range Resolution Accuracy (0.7% of reading 2 digits) Resistance " 3.3 k 32 k 0.01 k " 33 k 320 k 0.1 k " 330 k 3.2 M M " 3.3 M 32 M 0.01 M (2.5% of reading 1 digit)
6 8. Design a circuit that will convert the input values to the output values in the table on the right. Use standard ME 360 resistor values, i.e., 1k, 2.2k, 4.7k, 10k, 22k, 47k and 100k resistors. a) Draw a schematic diagram of your circuit design, showing all power and input/output connections. Input, E 1 Output, E O volts volts E 1 E O b) Draw your designed circuit layout on the breadboard below. Show all input/output connections to the circuit. Draw resistors like this 47 k 12V 5V Com 12V E 1 E O
7 8. Design a circuit that will convert the black box input values E 1 to the DMM output values E O in the table on the right. Use these resistor values only: 1k, 2.2k, 4.7k, 10k, 22k, 47k and 100k resistors. Follow all ME 360 rules and recommendations when selecting resistors. a) Draw a schematic diagram of your circuit design, showing all power and input/output connections. Name: Input, E 1 Output, E O volts volts b) Draw your designed circuit layout on the breadboard below. Show all power and input/output connections to the circuit. Draw resistors like this 22 k 12V 5V Com 12V E 1 E O
8 8. Design a circuit that will convert the black box input values E 1 to the DMM output values E O in the table on the right. Use these resistor values only: 1k, 2.2k, 4.7k, 10k, 22k, 47k and 100k resistors. Follow all ME 360 rules and recommendations when selecting resistors. a) Draw a schematic diagram of your circuit design, showing all power and input/output connections. Name: Input, E 1 Output, E O volts volts b) Draw your designed circuit layout on the breadboard below. Show all power and input/output connections to the circuit. Draw resistors like this 47k 12V 5V Com 12V E 1 E O
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