Vermont Technical College Electronics I – Laboratory ELT-2051 Lab 07: Transistor Biasing Circuits and Q-point Stability Objectives: • To set an operating point for a transistor using three different bias techniques • To explore amplification of an AC signal • To use MultiSim to verify your experimental data General: In this laboratory, you will be supplied with two NPN transistors with varying ß’s. Prelab: Calculate values of Rb in Figures 1 and 2 assuming ß = 200, VCE = 6V . For Figure 3, calculate R1 and R2 so that their parallel resistance is about 20KΩ or 10% of (ß+1)RE. Also, calculate the critical frequency of the 1uF capacitor in Figure 4. Materials: • 2N3904, 2N4123 NPN TXs (1 high ß, 1 low ß) • (2) 1 k Ohm, 100 k Ohm, assorted resistors • 1uF, 10uF capacitors • Curve Tracer • DC Power Supply • Multimeter • Signal Generator • Oscilloscope • Breadboard Procedure: 1. Use the curve tracer to plot the curves for each of your transistors. From these curves, again using the curve tracer, determine the ßDC for each transistor at the IC currents of 1mA, 3mA, 6mA, and 10mA with VCE = 6V. Of course, be sure to keep track of which transistor goes with which curve. Verify that the ßDC values that you obtain are within the manufacturer’s specifications. Remember– ßDC = hFE ! 2. For each of the three circuits shown in Figures 1-3, using the R values calculated in your prelab, determine the operating points IC and VCE for each of the transistors. Be sure to table your data. In addition, plot ß vs IC for both transistors on a single graph so that the data is meaningful! What conclusions can be reached for the 3 biasing circuits? 3. Lastly – Build Figure 4 and determine the ratio (Gain) of Vout/Vin at 1KHz. Now vary the frequency of Vin to determine at what frequencies this ratio decreases to 0.707 of the value at 1KHz. 4. Use the Bode Plotter feature in MultiSim to verify your data of Part 3. Is the cut-off frequency the same as you measured in the lab? Base Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Emitter Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Voltage Divider Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Laboratory Report: This lab is a semi-formal lab. Be sure to collect all data necessary to make observations and answer questions before you leave the lab. Also, you and your lab partner should discuss the results and outcomes prior to leaving. Take notes, fill in tables and include diagrams as needed. Your report should include: • Data Table • Beta Plot • MultiSim Frequency Response • Comparison of biasing schemes • Comparison of measurements vs. simulations and expectations.

## Vermont Technical College Electronics I – Laboratory ELT-2051 Lab 07: Transistor Biasing Circuits and Q-point Stability Objectives: • To set an operating point for a transistor using three different bias techniques • To explore amplification of an AC signal • To use MultiSim to verify your experimental data General: In this laboratory, you will be supplied with two NPN transistors with varying ß’s. Prelab: Calculate values of Rb in Figures 1 and 2 assuming ß = 200, VCE = 6V . For Figure 3, calculate R1 and R2 so that their parallel resistance is about 20KΩ or 10% of (ß+1)RE. Also, calculate the critical frequency of the 1uF capacitor in Figure 4. Materials: • 2N3904, 2N4123 NPN TXs (1 high ß, 1 low ß) • (2) 1 k Ohm, 100 k Ohm, assorted resistors • 1uF, 10uF capacitors • Curve Tracer • DC Power Supply • Multimeter • Signal Generator • Oscilloscope • Breadboard Procedure: 1. Use the curve tracer to plot the curves for each of your transistors. From these curves, again using the curve tracer, determine the ßDC for each transistor at the IC currents of 1mA, 3mA, 6mA, and 10mA with VCE = 6V. Of course, be sure to keep track of which transistor goes with which curve. Verify that the ßDC values that you obtain are within the manufacturer’s specifications. Remember– ßDC = hFE ! 2. For each of the three circuits shown in Figures 1-3, using the R values calculated in your prelab, determine the operating points IC and VCE for each of the transistors. Be sure to table your data. In addition, plot ß vs IC for both transistors on a single graph so that the data is meaningful! What conclusions can be reached for the 3 biasing circuits? 3. Lastly – Build Figure 4 and determine the ratio (Gain) of Vout/Vin at 1KHz. Now vary the frequency of Vin to determine at what frequencies this ratio decreases to 0.707 of the value at 1KHz. 4. Use the Bode Plotter feature in MultiSim to verify your data of Part 3. Is the cut-off frequency the same as you measured in the lab? Base Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Emitter Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Voltage Divider Bias: Parameter Calculated Value Simulated Value Measured Value VCE1 (high β) VCE2 (low β) n/a n/a |VCE1 – VCE2| 0 0 IC1 (high β) IC2 (low β) n/a n/a |IC1 – IC2| 0 0 Laboratory Report: This lab is a semi-formal lab. Be sure to collect all data necessary to make observations and answer questions before you leave the lab. Also, you and your lab partner should discuss the results and outcomes prior to leaving. Take notes, fill in tables and include diagrams as needed. Your report should include: • Data Table • Beta Plot • MultiSim Frequency Response • Comparison of biasing schemes • Comparison of measurements vs. simulations and expectations.

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Homework 3 For Homework 3, answer each of the five questions below from this article Granena, G., & Long, M. (2013). Age of onset, length of residence, language aptitude, and ultimate attainment in three linguistic domains. Second Language Research, 29, 311-343. You will probably need no more than a paragraph for each question. These are very general questions about the main points of the article. As I am interested in how you understand the article, do not use quotes for your answers, but rather your own words. 1. What was the purpose of the study? 2. Who did they investigate? 3. What was the procedure? 4. What were the results? 5. What are the implications of the study for our understanding of language development in general and the Critical Period Hypothesis in particular?

## Homework 3 For Homework 3, answer each of the five questions below from this article Granena, G., & Long, M. (2013). Age of onset, length of residence, language aptitude, and ultimate attainment in three linguistic domains. Second Language Research, 29, 311-343. You will probably need no more than a paragraph for each question. These are very general questions about the main points of the article. As I am interested in how you understand the article, do not use quotes for your answers, but rather your own words. 1. What was the purpose of the study? 2. Who did they investigate? 3. What was the procedure? 4. What were the results? 5. What are the implications of the study for our understanding of language development in general and the Critical Period Hypothesis in particular?

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Sex, Gender, and Popular Culture Spring 2015 Look through popular magazines, and see if you can find advertisements that objectify women in order to sell a product. Alternately, you may use an advertisement on television (but make sure to provide a link to the ad so I can see it!). Study these images then write a paper about objectification that deals with all or some of the following: • What effect(s), if any, do you think the objectification of women’s bodies has on our culture? • Jean Kilbourne states “turning a human being into a thing is almost always the first step toward justifying violence against that person.” What do you think she means by this? Do you agree with her reasoning? Why or why not? • Some people would argue that depicting a woman’s body as an object is a form of art. What is your opinion of this point of view? Explain your reasoning. • Why do you think that women are objectified more often than men are? • How does sexualization and objectification play out differently across racial lines? • Kilbourne explains that the consequences of being objectified are different – and more serious – for women than for men. Do you agree? How is the world different for women than it is for men? How do objectified images of women interact with those in our culture differently from the way images of men do? Why is it important to look at images in the context of the culture? • What is the difference between sexual objectification and sexual subjectification? (Ros Gill ) • How do ads construct violent white masculinity and how does that vision of masculinity hurt both men and women? Throughout your written analysis, be sure to make clear and specific reference to the images you selected, and please submit these images with your paper. Make sure you engage with and reference to at least 4 of the following authors: Kilbourne, Bordo, Hunter & Soto, Rose, Durham, Gill, Katz, Schuchardt, Ono and Buescher. Guidelines:  Keep your content focused on structural, systemic, institutional factors rather than the individual: BE ANALYTICAL NOT ANECDOTAL.  Avoid using the first person or including personal stories/reactions. You must make sure to actively engage with your readings: these essays need to be informed and framed by the theoretical material you have been reading this semester.  Keep within the 4-6 page limit; use 12-point font, double spacing and 1-inch margins.  Use formal writing conventions (introduction/thesis statement, body, conclusion) and correct grammar. Resources may be cited within the text of your paper, i.e. (Walters, 2013).

## Sex, Gender, and Popular Culture Spring 2015 Look through popular magazines, and see if you can find advertisements that objectify women in order to sell a product. Alternately, you may use an advertisement on television (but make sure to provide a link to the ad so I can see it!). Study these images then write a paper about objectification that deals with all or some of the following: • What effect(s), if any, do you think the objectification of women’s bodies has on our culture? • Jean Kilbourne states “turning a human being into a thing is almost always the first step toward justifying violence against that person.” What do you think she means by this? Do you agree with her reasoning? Why or why not? • Some people would argue that depicting a woman’s body as an object is a form of art. What is your opinion of this point of view? Explain your reasoning. • Why do you think that women are objectified more often than men are? • How does sexualization and objectification play out differently across racial lines? • Kilbourne explains that the consequences of being objectified are different – and more serious – for women than for men. Do you agree? How is the world different for women than it is for men? How do objectified images of women interact with those in our culture differently from the way images of men do? Why is it important to look at images in the context of the culture? • What is the difference between sexual objectification and sexual subjectification? (Ros Gill ) • How do ads construct violent white masculinity and how does that vision of masculinity hurt both men and women? Throughout your written analysis, be sure to make clear and specific reference to the images you selected, and please submit these images with your paper. Make sure you engage with and reference to at least 4 of the following authors: Kilbourne, Bordo, Hunter & Soto, Rose, Durham, Gill, Katz, Schuchardt, Ono and Buescher. Guidelines:  Keep your content focused on structural, systemic, institutional factors rather than the individual: BE ANALYTICAL NOT ANECDOTAL.  Avoid using the first person or including personal stories/reactions. You must make sure to actively engage with your readings: these essays need to be informed and framed by the theoretical material you have been reading this semester.  Keep within the 4-6 page limit; use 12-point font, double spacing and 1-inch margins.  Use formal writing conventions (introduction/thesis statement, body, conclusion) and correct grammar. Resources may be cited within the text of your paper, i.e. (Walters, 2013).

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CE 309 Fluid Mechanics Laboratory 2015 Assignment: ABET Criterion b You are tasked by SMU to design laboratory equipment for accurately determining discharge coefficients of an orifice in a reservoir discharging into the atmosphere (free jet). The equipment will be used in an undergraduate fluid mechanics laboratory class. You are not allowed to recommend an over-the-shelf system sold by manufacturers but must begin with basic materials. Your design must include the following; • Neat sketches and drawing illustrating your design. Sketches must be to scale. All sections of the sketch must be labeled in detail. As an example, a proposed motor must show the type, horsepower as well as any details necessary for the acquisition of the motor. • Statement of cost of individual items as well as the gross. It must also include installation costs where applicable. You are encouraged to recommend modern instrumentation in you design however costs must be kept as reasonable as possible. An esoteric system with no regard to the cost is of little value. Justify all your choices. • Develop a procedure for students operating the system to achieve the laboratory objectives. Indicate the advantages of your design over the current. • Keep your report to 3 pages maximum.

## CE 309 Fluid Mechanics Laboratory 2015 Assignment: ABET Criterion b You are tasked by SMU to design laboratory equipment for accurately determining discharge coefficients of an orifice in a reservoir discharging into the atmosphere (free jet). The equipment will be used in an undergraduate fluid mechanics laboratory class. You are not allowed to recommend an over-the-shelf system sold by manufacturers but must begin with basic materials. Your design must include the following; • Neat sketches and drawing illustrating your design. Sketches must be to scale. All sections of the sketch must be labeled in detail. As an example, a proposed motor must show the type, horsepower as well as any details necessary for the acquisition of the motor. • Statement of cost of individual items as well as the gross. It must also include installation costs where applicable. You are encouraged to recommend modern instrumentation in you design however costs must be kept as reasonable as possible. An esoteric system with no regard to the cost is of little value. Justify all your choices. • Develop a procedure for students operating the system to achieve the laboratory objectives. Indicate the advantages of your design over the current. • Keep your report to 3 pages maximum.

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Please answer the following questions: You’re a leader in your company or organization (based on your concentration area). You need to make a decision on whether your company or organization shall start a new initiative. To make an informed decision, you plan to do some research. 1. Suppose that you have a list of 2700 employees in your company or organization, please describe in detail how you would use the systematic sampling method to select 30 participants for your study. 2. There are fewer male employees in your company. If you want to be sure these male employees are equally represented in your study, what sampling procedure should you use? Please describe in detail what you would do. 3. Suppose that you selected 30 employees (participants) for your study, you gave them a survey on their attitude towards the possible new initiative. What are some possible threats to the internal validity of this design? 4. The survey results indicated that your employees have mixed attitudes towards the new initiative. To be on the safe side, you would like to run a pilot study to examine the impact of the new initiative on employees’ productivity. Please describe in detail how you could use a true experimental design to address this research question. 5. Which statistical procedure would you use to analyze the quantitative data you collected from your pilot study (with a true experimental design) to address your research question? “

## Please answer the following questions: You’re a leader in your company or organization (based on your concentration area). You need to make a decision on whether your company or organization shall start a new initiative. To make an informed decision, you plan to do some research. 1. Suppose that you have a list of 2700 employees in your company or organization, please describe in detail how you would use the systematic sampling method to select 30 participants for your study. 2. There are fewer male employees in your company. If you want to be sure these male employees are equally represented in your study, what sampling procedure should you use? Please describe in detail what you would do. 3. Suppose that you selected 30 employees (participants) for your study, you gave them a survey on their attitude towards the possible new initiative. What are some possible threats to the internal validity of this design? 4. The survey results indicated that your employees have mixed attitudes towards the new initiative. To be on the safe side, you would like to run a pilot study to examine the impact of the new initiative on employees’ productivity. Please describe in detail how you could use a true experimental design to address this research question. 5. Which statistical procedure would you use to analyze the quantitative data you collected from your pilot study (with a true experimental design) to address your research question? “

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Explain the significant impact this career development experience has had and will continue to have on your life.

## Explain the significant impact this career development experience has had and will continue to have on your life.

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Project #1 Correspondence Packet (email, memo, letter) For this assignment you will produce a folder of professional correspondence. You will need to draw from actual personal experience, or imagine a scenario that will satisfy the assignment. Please refer to Chapter 10 in A Concise Guide for Technical Communication for formatting information. For a sample of standard memo format look at Figure 10.2 (page 191) & for letter sample refer to Figure 10.5 (page 199). Remember: The key to successful professional correspondence is brevity and coherence. One email, written to a co-worker and discussing a problem in the workplace. One short memo, directed to employees in your charge and explaining a new product or procedure. One professional business letter, directed to a consumer who is requesting an estimate for your/your company’s product(s) and/or services.

## Project #1 Correspondence Packet (email, memo, letter) For this assignment you will produce a folder of professional correspondence. You will need to draw from actual personal experience, or imagine a scenario that will satisfy the assignment. Please refer to Chapter 10 in A Concise Guide for Technical Communication for formatting information. For a sample of standard memo format look at Figure 10.2 (page 191) & for letter sample refer to Figure 10.5 (page 199). Remember: The key to successful professional correspondence is brevity and coherence. One email, written to a co-worker and discussing a problem in the workplace. One short memo, directed to employees in your charge and explaining a new product or procedure. One professional business letter, directed to a consumer who is requesting an estimate for your/your company’s product(s) and/or services.

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Learning Goals: Students will be able to determine the gravitational acceleration of “Planet X” 1. Research to find equations that would help you find g using a pendulum. Design an experiment and test your design using Moon and Jupiter. Write your procedure in a paragraph that another student could use to verify your results. Show your data, graphs, and calculations that support your strategy. 2. Use your procedure to find g on Planet X. Show your data, graphs, and calculations that support your conclusion. 3. Give your conclusion and write an error analysis.