MODULAR PROGRAMME

ASSESSMENT SPECIFICATION

 

Module Details

Module Code UFMFVA-15-1	Run	Module Title Electrical and Electronic Principles B
Module Leader Sabir Ghauri	Module Tutors Sabir Ghauri
Component and Element Number Resit CW 2018		Weighting: (% of the Module’s assessment) 50%
Element Description Referral Coursework Assignment (Numerical/Lab/Research) Element B		Total Assignment time 19 hours

Dates

Date Issued to Students 10.06.2018	Date to be Returned to Students
Submission Place: A-Block (Help Desk open 9.00 – 5.00pm)	Submission Date 17.07.2018
	Submission Time 2.00 pm

Deliverables

Attached sheet details deliverables.

Module Leader Signature

 

 

REFRRAL COURSEWORK ASSIGNMENT 

Electrical and Electronic Principles B (UFMFVA-15-1)

Purpose of this part of the assignment

 

This assignment is intended to provide an opportunity for students to:-

 

• apply theoretical knowledge to understand the important elements of electrical and electronic (EE) systems.
• carry out lab-based exercise exploring the theoretical aspect in modern EE systems to supplement the taught part of the module.
• become familiar with simulation techniques and in particular with the use of the simulation package ‘Multisim’.
• produce a precise, concise and clear written solutions/report for marking purposes.

Introduction

 

The coursework will include the laboratory exercises which contains four labs sessions. You are required to carry out all these experiments using the given lab resources such as Multisim software platform and feedback DC motors kits.

 

The coursework assignment will be carried out individually. You must fill the cover sheet with your student ID. For any discussion on the topic or further information you may write

 

The hand-in date of the Resit CW assignment will be 17^th July 2018 at or before 2:00pm in A-Block.

 

Resources

 

NI Multisim simulation software

DC Motor Kits – available in 1N65

Available on PCs in Laboratory 2N40 and 2N24 with UWE password

Both labs will remain open between 9:00am and 5:00pm during the summer term time.

 

Deliverables

 

A written report which will include the details of all experimental works including observations, reading tables, graph papers, screen images and learning reflections. The maximum page limit will be 15 pages including diagrams and references

Assessment Scheme

 

Assignments will be assessed using the criteria indicated in front of each question. Quality and clarity of the written report will gain 10 marks.

 

Lab 1: [Total Marks: 30]

 

Aims and Objectives

 

The purpose of this lab is to experience and study the concept of DSB-AM modulation and demodulation by implementing it in Multisim simulation software. Examine the baseband signal modulation by non-linear device diode. By the end of this lab, you should be able to analyse the modulation of DSB-AM. You are required to record all activities (observations, results and comments) on your report as you perform the simulation.

 

Equipment required:

Desktop PC, Multisim software, scientific calculator and notebook/plain papers

 

Procedure:

 

1. Using Multisim construct the following circuits: [4 Marks]

Examine the modulated waveform then discuss the following:

 

1. Provide variable frequency to baseband and carrier generators and observe effects on the modulated waveforms. [5 Marks]
2. Find the mathematical expressions of all baseband signal, carrier and modulated waveform.             [6 Marks]

• Find the values of modulation index when you change the amplitude of baseband signal. [2 Marks]

1. Describe the spectrum of DSB-AM. [3 Marks]

 

 

2. Discussion on Results and Observations:

Summarise the whole lab session in your own words and conclude what did you gain from this exercise? Explain why did you use passive components such as capacitor and inductor at the output? What are the drawbacks of these circuits? Comment on the skills you gained in this lab session – how do you feel about the session in terms of addressing the learning outcomes of the module spec?                                                                                      [10 Marks]

 

 Lab 2: [Total Marks: 100]

 

Aims and Objectives

 

The purpose of this lab is to experience and study the concept of DSB-AM modulation and demodulation by implementing it in Matlab Simulink/Communication Blocksets/Signal Processing Blocksets. Examine the baseband signal modulation and demodulation by both envelope and coherent methods. By the end of this lab, you should be able to analyse the modulation and demodulation of DSB-AM and DSB-SC-AM. You are required to record all activities (observations, results and comments) on your report as you perform the simulation.

 

Equipment required:

Desktop PC, Matlab software, scientific calculator and notebook/plain papers

 

Procedure:

 

3. Using Matlab Simulink plus Communication Blocksets construct the following Simulink model of the circuits:                                     [5 Marks]

 

 

 

 

Examine the modulated waveform then discuss the following:

 

1. Provide variable frequency to baseband and carrier generators and observe effects on the modulated waveforms.                         [5 Marks]

 

1. Find the mathematical expressions of all baseband signal, carrier and modulated waveform.                         [5 Marks]

 

• Find the values of modulation index when you change the amplitude of baseband signal.             [5 Marks]

 

1. Describe the spectrum of DSB-AM.             [5 Marks]

 

1. Change biasing to zero value to create DSB-SC-AM and describe its spectrum. [5 Marks]

 

 

4. Create the following block diagram model of envelope detection of DSB-AM using Matlab software and then discuss the following: [5 Marks]

 

 

 

 

 

 

1. Discuss the stage by stage output of the recovered signal. [5 Marks]

 

1. Alter the position of spectrum analyser to study the harmonic frequencies. [5 Marks]

 

1. Comment on the method used and its merits and demerits. [5 Marks]

 

 

 

5. Create the following block diagram model of coherent detection of DSB-AM using Matlab software and then discuss the following: [5 Marks]

 

 

 

 

 

 

 

 

1. Discuss the stage by stage output of the recovered signal. [5 Marks]

 

1. Connect a spectrum analyser at appropriate points to study the harmonic frequencies. [5 Marks]

 

1. Comment on the method used and its merits and demerits. [5 Marks]

 

 

 

6. Discussion on Results and Observations:

Summarise the whole lab session in your own words and conclude what did you gain from this exercise? Summarise the whole lab session in your own words and conclude what did you gain from this exercise? Comment on the skills you gained in this lab session – how do you feel about this lab in terms of addressing the learning outcomes of the module spec?  [30 Marks]

 

 

 

 

 

 

 

 

 

 

 

Lab 3: [Total Marks: 30]

 

Aims and Objectives

 

The purpose of this lab is to study the behaviour of a Digital to Analogue Conversion Circuit by using a resistor ladder and implementing in Multisim software. Examine the circuit first and then calculate the analogue output voltage and implement by using Multisim software to verify your calculations. You are required to record all the activities (i.e., calculated results and comments) in your report as you carry out the task.

 

Equipment required:

Desktop PC, Matlab Simulink software, scientific calculator and Logbook

 

Procedure:

 

1. Draw the following circuit diagram and answer the questions by setting the switching for the right digital digits first by calculating the analogue value and then by implementing using Multisim Software: [4 Marks]

 

2. Calculate the analogue voltages for the digital inputs (1101)₂, (1001)₂, (1110)₂ and (1111)₂.             [8 Marks]

 

1. Implement the inputs given in item (a) and verify your results using Multisim software.                         [4 Marks]

 

2. Redraw the above circuit that will suit to eight digits inputs and calculate the analogue output for the given input, i.e., (11010001)₂. [4 Marks]

 

1. Using the Multisim confirm your results you have gained in part 2 in the above.       [4 Marks]

 

4. Discussion on Results and Observations:

Summarise the whole lab session in your own words and conclude what did you gain from this exercise? Explain your experience of analysing electronic circuits that use passive and active components such as resistor and operational amplifiers. What are the drawbacks of these circuits? Comment on the skills you gained in this lab session – how do you feel about the session in terms of addressing the learning outcomes of the module spec.                                                                                             [6 Marks]

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Lab 4: [Total Marks: 100]

 

The main objective is to understand the features of transducer, actuator and open-loop and closed-loop control systems. You are provided with DC Feedback Kits (Analogue Mechanical Unit and Control Unit). You will apply the power to DC motor through a power amplifier and then study its characteristics. After it you will be studying the control of the motor using open-loop and closed loop connections. After the completion of this lab, you should be able to understand the drawbacks and good features of both systems. Search some of the applications of these systems and record in your report.

 

Equipment required:

 

DC Motor Kit (includes analogue and control units), power supply, Connecting leads, Oscilloscope, Digital Multimeter and graph paper, Logbook

 

Procedure:

 

1. Calibrate the Tachogenerator by recording the output voltage for a range of shaft speeds. Connect the diagram as shown in Figure 1. Change the input power to the power amplifier by changing the variable resistor (connected in series with the power amplifier). Record the speed and output voltage of the Tachogenerator. Using graphical methods and assuming a linear relationship:

• Plot a graph of tacho output voltage, , against shaft speed, N (radians/sec).          [10 Marks]
• Determine the tachometer constant K_t (Volts per radian per second) such that          [10 Marks]

Figure 1

 

 

Figure 2: Power Supply Connections

 

2. Connect the control unit as shown in Figure 3. The connections show that the motor is connected in the open-loop configuration. Also connect an oscilloscope at the output of the motor or tacho to visualise the output. Use position dial and control the shaft position.          [10 Marks]

Figure 3: Open-loop Control

• Can you achieve a position point of the shaft by moving input position dial? Explain fully with arguments.          [10 Marks]
• Sketch a block diagram and label you black diagram with appropriate block names.             [5 Marks]
• Display the oscilloscope screen and attached with your report. [5 Marks]

 

3. Repeat the procedure step 2 but now close the loop as shown in Figure 4.

Figure 4: Closed-loop Control

• Control the output shaft position by providing a reference input from the input dial. Compare it with the open-loop control and explain fully with arguments.                                                                                  [10 Marks]
• Sketch a block diagram and label you black diagram with appropriate block names.             [5 Marks]
• Display the oscilloscope screen and attached with your report.                                                                                                 [5 Marks]

Discussion on Results and Observations:

 

Give a detailed discussion of you observations and difficulties in controlling the output shaft position. Include merits and demerits of both systems in your discussion.  Summarise the whole lab session in your own words and conclude what did you gain from this exercise?                                                       [30 Marks]